pill design and performance

.prettierignore

@@ -2,4 +2,4 @@
 pnpm-lock.yaml
 **/.claude/**
 **/public/flutter/**
-**/z-timeline/**
+**/z-flutter/**

apps/web/src/components/flutter-view.tsx

@@ -28,60 +28,52 @@ declare global {
   }
 }
 
-type FlutterViewProps = {
-  state: FlutterTimelineState;
-  onEvent: (event: FlutterEvent) => void;
-  className?: string;
-  height?: number;
-};
+// ---------------------------------------------------------------------------
+// Module-level singleton state
+// ---------------------------------------------------------------------------
 
-export function FlutterView({
-  state,
-  onEvent,
-  className,
-  height,
-}: FlutterViewProps) {
-  const containerRef = useRef<HTMLDivElement>(null);
-  const [status, setStatus] = useState<"loading" | "ready" | "error">(
-    "loading"
-  );
-  const stateRef = useRef(state);
-  stateRef.current = state;
+let flutterContainer: HTMLDivElement | null = null;
+let engineReady = false;
+let initPromise: Promise<void> | null = null;
 
-  const onEventRef = useRef(onEvent);
-  onEventRef.current = onEvent;
-
-  useEffect(() => {
-    const container = containerRef.current;
-    if (!container) return;
-
-    let pollingInterval: ReturnType<typeof setInterval> | undefined;
-    let pollingTimeout: ReturnType<typeof setTimeout> | undefined;
+// Module-level refs so bridge closures always read latest values
+let currentStateRef: FlutterTimelineState | null = null;
+let currentOnEventRef: ((event: FlutterEvent) => void) | null = null;
 
+function ensureBridge() {
+  if (window.__zendegi__) return;
   window.__zendegi__ = {
-      getState: () => JSON.stringify(stateRef.current),
+    getState: () => JSON.stringify(currentStateRef),
     onEvent: (json: string) => {
       const event = JSON.parse(json) as FlutterEvent;
-        onEventRef.current(event);
+      currentOnEventRef?.(event);
     },
   };
+}
 
-    const init = async () => {
+export function preloadFlutter() {
+  initFlutter();
+}
+
+function initFlutter(): Promise<void> {
+  if (initPromise) return initPromise;
+
+  initPromise = (async () => {
+    ensureBridge();
     // Load flutter.js if not already loaded
     if (!window._flutter) {
       await new Promise<void>((resolve, reject) => {
         if (document.querySelector('script[src="/flutter/flutter.js"]')) {
-            // Script tag exists but hasn't finished — wait for _flutter to appear
-            pollingTimeout = setTimeout(() => {
-              clearInterval(pollingInterval);
+          const timeout = setTimeout(() => {
+            clearInterval(interval);
             reject(
-                new Error("Timed out waiting for flutter.js to initialize")
+              new Error("Timed out waiting for flutter.js to initialize"),
             );
           }, 10_000);
-            pollingInterval = setInterval(() => {
+          const interval = setInterval(() => {
             if (window._flutter) {
-                clearInterval(pollingInterval);
-                clearTimeout(pollingTimeout);
+              clearInterval(interval);
+              clearTimeout(timeout);
               resolve();
             }
           }, 50);
@@ -105,7 +97,13 @@ export function FlutterView({
       window._flutter!.buildConfig = await res.json();
     }
 
-      try {
+    // Create the persistent container once
+    if (!flutterContainer) {
+      flutterContainer = document.createElement("div");
+      flutterContainer.style.width = "100%";
+      flutterContainer.style.height = "100%";
+    }
+
     await window._flutter!.loader.load({
       config: {
         entrypointBaseUrl: "/flutter/",
@@ -113,27 +111,81 @@ export function FlutterView({
       },
       onEntrypointLoaded: async (engineInitializer) => {
         const appRunner = await engineInitializer.initializeEngine({
-              hostElement: container,
+          hostElement: flutterContainer!,
           assetBase: "/flutter/",
         });
         appRunner.runApp();
-            setStatus("ready");
       },
     });
-      } catch (error) {
-        throw new Error(
-          `Flutter engine initialization failed: ${error instanceof Error ? error.message : error}`
-        );
-      }
-    };
 
-    init().catch(() => setStatus("error"));
+    engineReady = true;
+  })().catch((error) => {
+    // Reset all module state so next mount retries
+    flutterContainer = null;
+    engineReady = false;
+    initPromise = null;
+    throw error;
+  });
+
+  return initPromise;
+}
+
+// ---------------------------------------------------------------------------
+// Component
+// ---------------------------------------------------------------------------
+
+type FlutterViewProps = {
+  state: FlutterTimelineState;
+  onEvent: (event: FlutterEvent) => void;
+  className?: string;
+  height?: number;
+};
+
+export function FlutterView({
+  state,
+  onEvent,
+  className,
+  height,
+}: FlutterViewProps) {
+  const containerRef = useRef<HTMLDivElement>(null);
+  const [status, setStatus] = useState<"loading" | "ready" | "error">(
+    engineReady ? "ready" : "loading",
+  );
+
+  // Keep module-level refs in sync
+  currentStateRef = state;
+  currentOnEventRef = onEvent;
+
+  useEffect(() => {
+    const wrapper = containerRef.current;
+    if (!wrapper) return;
+
+    if (engineReady && flutterContainer) {
+      // Engine already running — reparent immediately, no loading flash
+      wrapper.appendChild(flutterContainer);
+      setStatus("ready");
+      // Push latest state so Flutter renders the correct timeline
+      window.__zendegi__?.updateState?.(JSON.stringify(currentStateRef));
+    } else {
+      // First mount — initialize engine
+      setStatus("loading");
+      initFlutter()
+        .then(() => {
+          // Guard: component may have unmounted while awaiting
+          if (!containerRef.current || !flutterContainer) return;
+          wrapper.appendChild(flutterContainer);
+          setStatus("ready");
+          // Push current state after engine is ready
+          window.__zendegi__?.updateState?.(JSON.stringify(currentStateRef));
+        })
+        .catch(() => setStatus("error"));
+    }
 
     return () => {
-      clearInterval(pollingInterval);
-      clearTimeout(pollingTimeout);
-      container.replaceChildren();
-      delete (window as Partial<Window>).__zendegi__;
+      // Detach but don't destroy the Flutter container
+      if (flutterContainer?.parentElement === wrapper) {
+        wrapper.removeChild(flutterContainer);
+      }
     };
   }, []);
 

apps/web/src/components/item-form-drawer.tsx

@@ -1,10 +1,11 @@
-import { useState } from "react";
+import { useCallback, useEffect } from "react";
 import { useForm } from "@tanstack/react-form";
 import { useQueryClient } from "@tanstack/react-query";
 import { toast } from "sonner";
 
 import { Button } from "./ui/button";
 import { FieldControl, FieldError, FieldLabel, FieldRoot } from "./ui/field";
+import { inputClasses } from "./ui/input";
 import {
   DrawerClose,
   DrawerContent,
@@ -12,63 +13,101 @@ import {
   DrawerPortal,
   DrawerRoot,
   DrawerTitle,
-  DrawerTrigger,
   DrawerViewport,
 } from "./ui/drawer";
+import type { NormalizedGroup, NormalizedItem } from "@/functions/get-timeline";
+import { updateTimelineItem } from "@/functions/update-timeline-item";
 import { createTimelineItem } from "@/functions/create-timeline-item";
 
-export default function ItemFormDrawer({
-  timelineGroupId,
-  timelineId,
-}: {
-  timelineGroupId: string;
+type ItemFormDrawerProps = {
+  open: boolean;
+  onOpenChange: (open: boolean) => void;
   timelineId: string;
-}) {
-  const [open, setOpen] = useState(false);
+  groups: Record<string, NormalizedGroup | undefined>;
+  groupOrder: Array<string>;
+  editItem?: NormalizedItem | null;
+};
+
+export default function ItemFormDrawer({
+  open,
+  onOpenChange,
+  timelineId,
+  groups,
+  groupOrder,
+  editItem,
+}: ItemFormDrawerProps) {
+  const isEdit = !!editItem;
   const queryClient = useQueryClient();
 
+  const getDefaultValues = useCallback(
+    () => ({
+      title: editItem?.title ?? "",
+      description: editItem?.description ?? "",
+      start: editItem
+        ? editItem.start.toISOString().split("T")[0]
+        : new Date().toISOString().split("T")[0],
+      end: editItem?.end ? editItem.end.toISOString().split("T")[0] : "",
+      groupId: (editItem?.groupId ?? groupOrder[0]) || "",
+    }),
+    [editItem, groupOrder]
+  );
+
   const form = useForm({
-    defaultValues: {
-      title: "",
-      description: "",
-      start: new Date().toISOString().split("T")[0],
-      end: "",
-    },
+    defaultValues: getDefaultValues(),
     onSubmit: async ({ value }) => {
       try {
+        if (isEdit) {
+          await updateTimelineItem({
+            data: {
+              id: editItem.id,
+              title: value.title,
+              description: value.description,
+              start: value.start,
+              end: value.end || null,
+              timelineGroupId: value.groupId,
+              lane: editItem.lane,
+            },
+          });
+          toast.success("Item updated");
+        } else {
           await createTimelineItem({
             data: {
               title: value.title,
               description: value.description,
               start: value.start,
-            end: value.end || undefined,
-            timelineGroupId,
+              end: value.end || null,
+              timelineGroupId: value.groupId,
             },
           });
+          toast.success("Item created");
+        }
         await queryClient.invalidateQueries({
           queryKey: ["timeline", timelineId],
         });
-        setOpen(false);
+        onOpenChange(false);
         form.reset();
-        toast.success("Item created");
       } catch (error) {
         toast.error(
-          error instanceof Error ? error.message : "Failed to create item"
+          error instanceof Error
+            ? error.message
+            : `Failed to ${isEdit ? "update" : "create"} item`
         );
       }
     },
   });
 
+  useEffect(() => {
+    if (!open) return;
+    form.reset(getDefaultValues());
+  }, [open, getDefaultValues, form]);
+
   return (
-    <DrawerRoot open={open} onOpenChange={setOpen}>
-      <DrawerTrigger render={<Button variant="outline" size="sm" />}>
-        Add Item
-      </DrawerTrigger>
+    <DrawerRoot open={open} onOpenChange={onOpenChange}>
       <DrawerPortal>
         <DrawerViewport>
           <DrawerPopup>
             <div className="flex items-center justify-between border-b border-border p-4">
-              <DrawerTitle>New Item</DrawerTitle>
+              <DrawerTitle>{isEdit ? "Edit Item" : "New Item"}</DrawerTitle>
               <DrawerClose render={<Button variant="outline" size="sm" />}>
                 Close
               </DrawerClose>
@@ -122,6 +161,26 @@ export default function ItemFormDrawer({
                   )}
                 </form.Field>
 
+                <form.Field name="groupId">
+                  {(field) => (
+                    <FieldRoot>
+                      <FieldLabel>Group</FieldLabel>
+                      <select
+                        className={inputClasses}
+                        value={field.state.value}
+                        onBlur={field.handleBlur}
+                        onChange={(e) => field.handleChange(e.target.value)}
+                      >
+                        {groupOrder.map((id) => (
+                          <option key={id} value={id}>
+                            {groups[id]?.title ?? id}
+                          </option>
+                        ))}
+                      </select>
+                    </FieldRoot>
+                  )}
+                </form.Field>
+
                 <form.Field name="start">
                   {(field) => (
                     <FieldRoot>
@@ -168,7 +227,13 @@ export default function ItemFormDrawer({
                       type="submit"
                       disabled={!state.canSubmit || state.isSubmitting}
                     >
-                      {state.isSubmitting ? "Creating..." : "Create Item"}
+                      {state.isSubmitting
+                        ? isEdit
+                          ? "Saving..."
+                          : "Creating..."
+                        : isEdit
+                          ? "Save Changes"
+                          : "Create Item"}
                     </Button>
                   )}
                 </form.Subscribe>

apps/web/src/components/ui/drawer.tsx

@@ -26,7 +26,14 @@ const { viewport, popup, title, description, close, content } = drawerStyles();
 type DrawerRootProps = React.ComponentProps<typeof BaseDrawer.Root>;
 
 function DrawerRoot(props: DrawerRootProps) {
-  return <BaseDrawer.Root modal={false} swipeDirection="right" {...props} />;
+  return (
+    <BaseDrawer.Root
+      modal={false}
+      swipeDirection="right"
+      disablePointerDismissal
+      {...props}
+    />
+  );
 }
 
 type DrawerTriggerProps = React.ComponentProps<typeof BaseDrawer.Trigger>;

apps/web/src/entry-server.ts

@@ -0,0 +1,18 @@
+import {
+  createStartHandler,
+  defaultStreamHandler,
+} from "@tanstack/react-start/server";
+
+const handler = createStartHandler(defaultStreamHandler);
+
+export default {
+  async fetch(request: Request): Promise<Response> {
+    const response = await handler(request);
+    response.headers.set(
+      "Cross-Origin-Embedder-Policy",
+      "credentialless",
+    );
+    response.headers.set("Cross-Origin-Opener-Policy", "same-origin");
+    return response;
+  },
+};

apps/web/src/functions/create-timeline-item.ts

@@ -15,8 +15,8 @@ export const createTimelineItem = createServerFn({ method: "POST" })
       start: z.string().transform((s) => new Date(s)),
       end: z
         .string()
-        .optional()
-        .transform((s) => (s ? new Date(s) : undefined)),
+        .nullable()
+        .transform((s) => (s ? new Date(s) : null)),
       timelineGroupId: z.string().uuid(),
     })
   )

apps/web/src/functions/update-timeline-item.ts

@@ -17,6 +17,8 @@ export const updateTimelineItem = createServerFn({ method: "POST" })
         .transform((s) => (s ? new Date(s) : null)),
       timelineGroupId: z.string().uuid(),
       lane: z.number().int().min(1),
+      title: z.string().min(1).optional(),
+      description: z.string().optional(),
     })
   )
   .handler(async ({ data }) => {
@@ -27,6 +29,10 @@ export const updateTimelineItem = createServerFn({ method: "POST" })
         end: data.end,
         timelineGroupId: data.timelineGroupId,
         lane: data.lane,
+        ...(data.title !== undefined && { title: data.title }),
+        ...(data.description !== undefined && {
+          description: data.description,
+        }),
       })
       .where(eq(timelineItem.id, data.id))
       .returning();

apps/web/src/hooks/use-entry-resized-mutation.ts

@@ -0,0 +1,66 @@
+import { useMutation, useQueryClient } from "@tanstack/react-query";
+import type { NormalizedTimeline } from "@/functions/get-timeline";
+import { updateTimelineItem } from "@/functions/update-timeline-item";
+
+type EntryResizedVars = {
+  entryId: string;
+  newStart: string;
+  newEnd: string | null;
+  groupId: string;
+  lane: number;
+};
+
+export function useEntryResizedMutation(timelineId: string) {
+  const queryClient = useQueryClient();
+  const queryKey = ["timeline", timelineId];
+
+  return useMutation({
+    mutationFn: (vars: EntryResizedVars) =>
+      updateTimelineItem({
+        data: {
+          id: vars.entryId,
+          start: vars.newStart,
+          end: vars.newEnd,
+          timelineGroupId: vars.groupId,
+          lane: vars.lane,
+        },
+      }),
+
+    onMutate: async (vars) => {
+      // Cancel in-flight fetches so they don't overwrite our optimistic update
+      await queryClient.cancelQueries({ queryKey });
+      const previous = queryClient.getQueryData<NormalizedTimeline>(queryKey);
+
+      queryClient.setQueryData<NormalizedTimeline>(queryKey, (old) => {
+        if (!old) return old;
+
+        return {
+          ...old,
+          items: {
+            ...old.items,
+            [vars.entryId]: {
+              ...old.items[vars.entryId],
+              start: new Date(vars.newStart),
+              end: vars.newEnd ? new Date(vars.newEnd) : null,
+              lane: vars.lane,
+            },
+          },
+        };
+      });
+
+      return { previous };
+    },
+
+    onError: (_err, _vars, context) => {
+      // Roll back to the previous cache state on server error
+      if (context?.previous) {
+        queryClient.setQueryData(queryKey, context.previous);
+      }
+    },
+
+    onSettled: () => {
+      // Re-fetch from server to ensure consistency
+      queryClient.invalidateQueries({ queryKey });
+    },
+  });
+}

apps/web/src/lib/assign-lane.ts

@@ -6,7 +6,7 @@
  * lanes on item creation.
  */
 export function assignLane(
-  existingItems: { start: Date; end: Date | null; lane: number }[],
+  existingItems: Array<{ start: Date; end: Date | null; lane: number }>,
   newStart: Date,
   newEnd: Date | null
 ): number {

apps/web/src/lib/flutter-bridge.ts

@@ -55,4 +55,14 @@ export type FlutterEvent =
         newGroupId: string;
         newLane: number;
       };
+    }
+  | {
+      type: "entry_resized";
+      payload: {
+        entryId: string;
+        newStart: string;
+        newEnd: string | null;
+        groupId: string;
+        lane: number;
+      };
     };

apps/web/src/routeTree.gen.ts

@@ -9,14 +9,15 @@
 // Additionally, you should also exclude this file from your linter and/or formatter to prevent it from being checked or modified.
 
 import { Route as rootRouteImport } from './routes/__root'
-import { Route as TimelinesRouteImport } from './routes/timelines'
 import { Route as TimelineRouteImport } from './routes/timeline'
-import { Route as LoginRouteImport } from './routes/login'
 import { Route as DemoRouteImport } from './routes/demo'
 import { Route as DashboardRouteImport } from './routes/dashboard'
 import { Route as ConsentRouteImport } from './routes/consent'
-import { Route as IndexRouteImport } from './routes/index'
+import { Route as DefaultRouteImport } from './routes/_default'
+import { Route as DefaultIndexRouteImport } from './routes/_default.index'
 import { Route as TimelineTimelineIdRouteImport } from './routes/timeline.$timelineId'
+import { Route as DefaultTimelinesRouteImport } from './routes/_default.timelines'
+import { Route as DefaultLoginRouteImport } from './routes/_default.login'
 import { Route as DotwellKnownOpenidConfigurationRouteImport } from './routes/[.well-known]/openid-configuration'
 import { Route as DotwellKnownOauthProtectedResourceRouteImport } from './routes/[.well-known]/oauth-protected-resource'
 import { Route as DotwellKnownOauthAuthorizationServerRouteImport } from './routes/[.well-known]/oauth-authorization-server'
@@ -24,21 +25,11 @@ import { Route as ApiMcpSplatRouteImport } from './routes/api/mcp/$'
 import { Route as ApiAuthSplatRouteImport } from './routes/api/auth/$'
 import { Route as DotwellKnownOauthAuthorizationServerApiAuthRouteImport } from './routes/[.well-known]/oauth-authorization-server.api.auth'
 
-const TimelinesRoute = TimelinesRouteImport.update({
-  id: '/timelines',
-  path: '/timelines',
-  getParentRoute: () => rootRouteImport,
-} as any)
 const TimelineRoute = TimelineRouteImport.update({
   id: '/timeline',
   path: '/timeline',
   getParentRoute: () => rootRouteImport,
 } as any)
-const LoginRoute = LoginRouteImport.update({
-  id: '/login',
-  path: '/login',
-  getParentRoute: () => rootRouteImport,
-} as any)
 const DemoRoute = DemoRouteImport.update({
   id: '/demo',
   path: '/demo',
@@ -54,16 +45,30 @@ const ConsentRoute = ConsentRouteImport.update({
   path: '/consent',
   getParentRoute: () => rootRouteImport,
 } as any)
-const IndexRoute = IndexRouteImport.update({
+const DefaultRoute = DefaultRouteImport.update({
+  id: '/_default',
+  getParentRoute: () => rootRouteImport,
+} as any)
+const DefaultIndexRoute = DefaultIndexRouteImport.update({
   id: '/',
   path: '/',
-  getParentRoute: () => rootRouteImport,
+  getParentRoute: () => DefaultRoute,
 } as any)
 const TimelineTimelineIdRoute = TimelineTimelineIdRouteImport.update({
   id: '/$timelineId',
   path: '/$timelineId',
   getParentRoute: () => TimelineRoute,
 } as any)
+const DefaultTimelinesRoute = DefaultTimelinesRouteImport.update({
+  id: '/timelines',
+  path: '/timelines',
+  getParentRoute: () => DefaultRoute,
+} as any)
+const DefaultLoginRoute = DefaultLoginRouteImport.update({
+  id: '/login',
+  path: '/login',
+  getParentRoute: () => DefaultRoute,
+} as any)
 const DotwellKnownOpenidConfigurationRoute =
   DotwellKnownOpenidConfigurationRouteImport.update({
     id: '/.well-known/openid-configuration',
@@ -100,50 +105,51 @@ const DotwellKnownOauthAuthorizationServerApiAuthRoute =
   } as any)
 
 export interface FileRoutesByFullPath {
-  '/': typeof IndexRoute
+  '/': typeof DefaultIndexRoute
   '/consent': typeof ConsentRoute
   '/dashboard': typeof DashboardRoute
   '/demo': typeof DemoRoute
-  '/login': typeof LoginRoute
   '/timeline': typeof TimelineRouteWithChildren
-  '/timelines': typeof TimelinesRoute
   '/.well-known/oauth-authorization-server': typeof DotwellKnownOauthAuthorizationServerRouteWithChildren
   '/.well-known/oauth-protected-resource': typeof DotwellKnownOauthProtectedResourceRoute
   '/.well-known/openid-configuration': typeof DotwellKnownOpenidConfigurationRoute
+  '/login': typeof DefaultLoginRoute
+  '/timelines': typeof DefaultTimelinesRoute
   '/timeline/$timelineId': typeof TimelineTimelineIdRoute
   '/api/auth/$': typeof ApiAuthSplatRoute
   '/api/mcp/$': typeof ApiMcpSplatRoute
   '/.well-known/oauth-authorization-server/api/auth': typeof DotwellKnownOauthAuthorizationServerApiAuthRoute
 }
 export interface FileRoutesByTo {
-  '/': typeof IndexRoute
   '/consent': typeof ConsentRoute
   '/dashboard': typeof DashboardRoute
   '/demo': typeof DemoRoute
-  '/login': typeof LoginRoute
   '/timeline': typeof TimelineRouteWithChildren
-  '/timelines': typeof TimelinesRoute
   '/.well-known/oauth-authorization-server': typeof DotwellKnownOauthAuthorizationServerRouteWithChildren
   '/.well-known/oauth-protected-resource': typeof DotwellKnownOauthProtectedResourceRoute
   '/.well-known/openid-configuration': typeof DotwellKnownOpenidConfigurationRoute
+  '/login': typeof DefaultLoginRoute
+  '/timelines': typeof DefaultTimelinesRoute
   '/timeline/$timelineId': typeof TimelineTimelineIdRoute
+  '/': typeof DefaultIndexRoute
   '/api/auth/$': typeof ApiAuthSplatRoute
   '/api/mcp/$': typeof ApiMcpSplatRoute
   '/.well-known/oauth-authorization-server/api/auth': typeof DotwellKnownOauthAuthorizationServerApiAuthRoute
 }
 export interface FileRoutesById {
   __root__: typeof rootRouteImport
-  '/': typeof IndexRoute
+  '/_default': typeof DefaultRouteWithChildren
   '/consent': typeof ConsentRoute
   '/dashboard': typeof DashboardRoute
   '/demo': typeof DemoRoute
-  '/login': typeof LoginRoute
   '/timeline': typeof TimelineRouteWithChildren
-  '/timelines': typeof TimelinesRoute
   '/.well-known/oauth-authorization-server': typeof DotwellKnownOauthAuthorizationServerRouteWithChildren
   '/.well-known/oauth-protected-resource': typeof DotwellKnownOauthProtectedResourceRoute
   '/.well-known/openid-configuration': typeof DotwellKnownOpenidConfigurationRoute
+  '/_default/login': typeof DefaultLoginRoute
+  '/_default/timelines': typeof DefaultTimelinesRoute
   '/timeline/$timelineId': typeof TimelineTimelineIdRoute
+  '/_default/': typeof DefaultIndexRoute
   '/api/auth/$': typeof ApiAuthSplatRoute
   '/api/mcp/$': typeof ApiMcpSplatRoute
   '/.well-known/oauth-authorization-server/api/auth': typeof DotwellKnownOauthAuthorizationServerApiAuthRoute
@@ -155,58 +161,57 @@ export interface FileRouteTypes {
     | '/consent'
     | '/dashboard'
     | '/demo'
-    | '/login'
     | '/timeline'
-    | '/timelines'
     | '/.well-known/oauth-authorization-server'
     | '/.well-known/oauth-protected-resource'
     | '/.well-known/openid-configuration'
+    | '/login'
+    | '/timelines'
     | '/timeline/$timelineId'
     | '/api/auth/$'
     | '/api/mcp/$'
     | '/.well-known/oauth-authorization-server/api/auth'
   fileRoutesByTo: FileRoutesByTo
   to:
-    | '/'
     | '/consent'
     | '/dashboard'
     | '/demo'
-    | '/login'
     | '/timeline'
-    | '/timelines'
     | '/.well-known/oauth-authorization-server'
     | '/.well-known/oauth-protected-resource'
     | '/.well-known/openid-configuration'
+    | '/login'
+    | '/timelines'
     | '/timeline/$timelineId'
+    | '/'
     | '/api/auth/$'
     | '/api/mcp/$'
     | '/.well-known/oauth-authorization-server/api/auth'
   id:
     | '__root__'
-    | '/'
+    | '/_default'
     | '/consent'
     | '/dashboard'
     | '/demo'
-    | '/login'
     | '/timeline'
-    | '/timelines'
     | '/.well-known/oauth-authorization-server'
     | '/.well-known/oauth-protected-resource'
     | '/.well-known/openid-configuration'
+    | '/_default/login'
+    | '/_default/timelines'
     | '/timeline/$timelineId'
+    | '/_default/'
     | '/api/auth/$'
     | '/api/mcp/$'
     | '/.well-known/oauth-authorization-server/api/auth'
   fileRoutesById: FileRoutesById
 }
 export interface RootRouteChildren {
-  IndexRoute: typeof IndexRoute
+  DefaultRoute: typeof DefaultRouteWithChildren
   ConsentRoute: typeof ConsentRoute
   DashboardRoute: typeof DashboardRoute
   DemoRoute: typeof DemoRoute
-  LoginRoute: typeof LoginRoute
   TimelineRoute: typeof TimelineRouteWithChildren
-  TimelinesRoute: typeof TimelinesRoute
   DotwellKnownOauthAuthorizationServerRoute: typeof DotwellKnownOauthAuthorizationServerRouteWithChildren
   DotwellKnownOauthProtectedResourceRoute: typeof DotwellKnownOauthProtectedResourceRoute
   DotwellKnownOpenidConfigurationRoute: typeof DotwellKnownOpenidConfigurationRoute
@@ -216,13 +221,6 @@ export interface RootRouteChildren {
 
 declare module '@tanstack/react-router' {
   interface FileRoutesByPath {
-    '/timelines': {
-      id: '/timelines'
-      path: '/timelines'
-      fullPath: '/timelines'
-      preLoaderRoute: typeof TimelinesRouteImport
-      parentRoute: typeof rootRouteImport
-    }
     '/timeline': {
       id: '/timeline'
       path: '/timeline'
@@ -230,13 +228,6 @@ declare module '@tanstack/react-router' {
       preLoaderRoute: typeof TimelineRouteImport
       parentRoute: typeof rootRouteImport
     }
-    '/login': {
-      id: '/login'
-      path: '/login'
-      fullPath: '/login'
-      preLoaderRoute: typeof LoginRouteImport
-      parentRoute: typeof rootRouteImport
-    }
     '/demo': {
       id: '/demo'
       path: '/demo'
@@ -258,12 +249,19 @@ declare module '@tanstack/react-router' {
       preLoaderRoute: typeof ConsentRouteImport
       parentRoute: typeof rootRouteImport
     }
-    '/': {
-      id: '/'
+    '/_default': {
+      id: '/_default'
+      path: ''
+      fullPath: '/'
+      preLoaderRoute: typeof DefaultRouteImport
+      parentRoute: typeof rootRouteImport
+    }
+    '/_default/': {
+      id: '/_default/'
       path: '/'
       fullPath: '/'
-      preLoaderRoute: typeof IndexRouteImport
-      parentRoute: typeof rootRouteImport
+      preLoaderRoute: typeof DefaultIndexRouteImport
+      parentRoute: typeof DefaultRoute
     }
     '/timeline/$timelineId': {
       id: '/timeline/$timelineId'
@@ -272,6 +270,20 @@ declare module '@tanstack/react-router' {
       preLoaderRoute: typeof TimelineTimelineIdRouteImport
       parentRoute: typeof TimelineRoute
     }
+    '/_default/timelines': {
+      id: '/_default/timelines'
+      path: '/timelines'
+      fullPath: '/timelines'
+      preLoaderRoute: typeof DefaultTimelinesRouteImport
+      parentRoute: typeof DefaultRoute
+    }
+    '/_default/login': {
+      id: '/_default/login'
+      path: '/login'
+      fullPath: '/login'
+      preLoaderRoute: typeof DefaultLoginRouteImport
+      parentRoute: typeof DefaultRoute
+    }
     '/.well-known/openid-configuration': {
       id: '/.well-known/openid-configuration'
       path: '/.well-known/openid-configuration'
@@ -317,6 +329,21 @@ declare module '@tanstack/react-router' {
   }
 }
 
+interface DefaultRouteChildren {
+  DefaultLoginRoute: typeof DefaultLoginRoute
+  DefaultTimelinesRoute: typeof DefaultTimelinesRoute
+  DefaultIndexRoute: typeof DefaultIndexRoute
+}
+
+const DefaultRouteChildren: DefaultRouteChildren = {
+  DefaultLoginRoute: DefaultLoginRoute,
+  DefaultTimelinesRoute: DefaultTimelinesRoute,
+  DefaultIndexRoute: DefaultIndexRoute,
+}
+
+const DefaultRouteWithChildren =
+  DefaultRoute._addFileChildren(DefaultRouteChildren)
+
 interface TimelineRouteChildren {
   TimelineTimelineIdRoute: typeof TimelineTimelineIdRoute
 }
@@ -345,13 +372,11 @@ const DotwellKnownOauthAuthorizationServerRouteWithChildren =
   )
 
 const rootRouteChildren: RootRouteChildren = {
-  IndexRoute: IndexRoute,
+  DefaultRoute: DefaultRouteWithChildren,
   ConsentRoute: ConsentRoute,
   DashboardRoute: DashboardRoute,
   DemoRoute: DemoRoute,
-  LoginRoute: LoginRoute,
   TimelineRoute: TimelineRouteWithChildren,
-  TimelinesRoute: TimelinesRoute,
   DotwellKnownOauthAuthorizationServerRoute:
     DotwellKnownOauthAuthorizationServerRouteWithChildren,
   DotwellKnownOauthProtectedResourceRoute:

apps/web/src/routes/__root.tsx

@@ -5,8 +5,6 @@ import {
   createRootRouteWithContext,
 } from "@tanstack/react-router";
 import { TanStackRouterDevtools } from "@tanstack/react-router-devtools";
-
-import Header from "../components/header";
 import appCss from "../index.css?url";
 import type { QueryClient } from "@tanstack/react-query";
 import { Toaster } from "@/components/ui/sonner";
@@ -47,7 +45,7 @@ export const Route = createRootRouteWithContext<RouterAppContext>()({
 
 function RootDocument() {
   return (
-    <html lang="en">
+    <html lang="en" suppressHydrationWarning>
       <head>
         <HeadContent />
         <script dangerouslySetInnerHTML={{ __html: themeScript }} />
@@ -55,7 +53,6 @@ function RootDocument() {
       <body>
         <ThemeProvider>
           <div className="grid min-h-svh grid-rows-[auto_1fr]">
-            <Header />
             <Outlet />
           </div>
           <Toaster richColors />

apps/web/src/routes/_default.index.tsx

@@ -12,7 +12,7 @@ import {
   FieldRoot,
 } from "@/components/ui/field";
 
-export const Route = createFileRoute("/")({
+export const Route = createFileRoute("/_default/")({
   component: HomeComponent,
 });
 

apps/web/src/routes/_default.timelines.tsx

@@ -0,0 +1,44 @@
+import { useEffect } from "react";
+import { createFileRoute, Link } from "@tanstack/react-router";
+import { useSuspenseQuery } from "@tanstack/react-query";
+import { timelinesQueryOptions } from "@/functions/get-timelines";
+import { preloadFlutter } from "@/components/flutter-view";
+
+export const Route = createFileRoute("/_default/timelines")({
+  loader: async ({ context }) => {
+    await context.queryClient.ensureQueryData(timelinesQueryOptions());
+  },
+  component: RouteComponent,
+});
+
+function RouteComponent() {
+  const timelinesQuery = useSuspenseQuery(timelinesQueryOptions());
+
+  useEffect(() => {
+    preloadFlutter();
+  }, []);
+  return (
+    <section className="container mx-auto max-w-3xl px-4 py-2">
+      <h1 className="text-4xl font-serif font-bold mb-6">Timelines</h1>
+      {timelinesQuery.data.length === 0 ? (
+        <p className="text-muted-foreground">No timelines yet.</p>
+      ) : (
+        <div className="space-y-3">
+          {timelinesQuery.data.map((t) => (
+            <Link
+              key={t.id}
+              to="/timeline/$timelineId"
+              params={{ timelineId: t.id }}
+              className="block border border-border rounded-lg p-4 hover:bg-accent transition-colors"
+            >
+              <h2 className="font-serif font-bold">{t.title}</h2>
+              <p className="text-sm text-muted-foreground">
+                {new Date(t.createdAt).toLocaleDateString()}
+              </p>
+            </Link>
+          ))}
+        </div>
+      )}
+    </section>
+  );
+}

apps/web/src/routes/_default.tsx

@@ -0,0 +1,15 @@
+import { Outlet, createFileRoute } from "@tanstack/react-router";
+import Header from "@/components/header";
+
+export const Route = createFileRoute("/_default")({
+  component: RouteComponent,
+});
+
+function RouteComponent() {
+  return (
+    <div>
+      <Header />
+      <Outlet />
+    </div>
+  );
+}

apps/web/src/routes/login.tsx

@@ -1,19 +0,0 @@
-import { createFileRoute } from "@tanstack/react-router";
-import { useState } from "react";
-
-import SignInForm from "@/components/sign-in-form";
-import SignUpForm from "@/components/sign-up-form";
-
-export const Route = createFileRoute("/login")({
-  component: RouteComponent,
-});
-
-function RouteComponent() {
-  const [showSignIn, setShowSignIn] = useState(false);
-
-  return showSignIn ? (
-    <SignInForm onSwitchToSignUp={() => setShowSignIn(false)} />
-  ) : (
-    <SignUpForm onSwitchToSignIn={() => setShowSignIn(true)} />
-  );
-}

apps/web/src/routes/timeline.$timelineId.tsx

@@ -1,10 +1,15 @@
 import { useCallback, useMemo, useState } from "react";
-import { createFileRoute } from "@tanstack/react-router";
+import { Link, createFileRoute } from "@tanstack/react-router";
 import { useSuspenseQuery } from "@tanstack/react-query";
+import { ArrowLeft, Moon, Plus, Sun } from "lucide-react";
 import type { FlutterEvent, FlutterTimelineState } from "@/lib/flutter-bridge";
 import { timelineQueryOptions } from "@/functions/get-timeline";
 import { FlutterView } from "@/components/flutter-view";
+import { Button } from "@/components/ui/button";
+import UserMenu from "@/components/user-menu";
+import ItemFormDrawer from "@/components/item-form-drawer";
 import { useEntryMovedMutation } from "@/hooks/use-entry-moved-mutation";
+import { useEntryResizedMutation } from "@/hooks/use-entry-resized-mutation";
 import { useTheme } from "@/lib/theme";
 
 export const Route = createFileRoute("/timeline/$timelineId")({
@@ -20,9 +25,15 @@ function RouteComponent() {
   const { timelineId } = Route.useParams();
   const { data: timeline } = useSuspenseQuery(timelineQueryOptions(timelineId));
   const [selectedItemId, setSelectedItemId] = useState<string | null>(null);
+  const [drawerOpen, setDrawerOpen] = useState(false);
   const [flutterHeight, setFlutterHeight] = useState<number | undefined>();
   const entryMoved = useEntryMovedMutation(timelineId);
-  const { theme } = useTheme();
+  const entryResized = useEntryResizedMutation(timelineId);
+  const { theme, toggleTheme } = useTheme();
+
+  const editItem = selectedItemId
+    ? (timeline.items[selectedItemId] ?? null)
+    : null;
 
   const flutterState: FlutterTimelineState = useMemo(
     () => ({
@@ -57,23 +68,71 @@ function RouteComponent() {
           break;
         case "item_selected":
           setSelectedItemId(event.payload.itemId);
+          setDrawerOpen(true);
           break;
         case "item_deselected":
           setSelectedItemId(null);
+          setDrawerOpen(false);
           break;
         case "entry_moved":
           entryMoved.mutate(event.payload);
           break;
+        case "entry_resized":
+          entryResized.mutate(event.payload);
+          break;
       }
     },
-    [entryMoved]
+    [entryMoved, entryResized]
   );
 
+  const handleDrawerOpenChange = useCallback((open: boolean) => {
+    setDrawerOpen(open);
+    if (!open) {
+      setSelectedItemId(null);
+    }
+  }, []);
+
+  const handleAddItem = useCallback(() => {
+    setSelectedItemId(null);
+    setDrawerOpen(true);
+  }, []);
+
   return (
     <div className="flex flex-col">
-      <h1 className="text-3xl font-serif font-bold mb-6 mx-4">
-        {timeline.title}
-      </h1>
+      <div className="flex flex-row items-center justify-between px-2 py-1">
+        <div className="flex items-center gap-2">
+          <Link
+            to="/timelines"
+            className="text-muted-foreground hover:text-foreground inline-flex size-8 items-center justify-center rounded-md transition-colors"
+            aria-label="Back to timelines"
+          >
+            <ArrowLeft className="size-4" />
+          </Link>
+          <h1 className="text-lg font-serif font-bold">{timeline.title}</h1>
+        </div>
+        <div className="flex items-center gap-2">
+          <Button variant="outline" size="sm" onClick={handleAddItem}>
+            <Plus className="size-4" />
+            Add Item
+          </Button>
+          <button
+            type="button"
+            onClick={toggleTheme}
+            className="text-muted-foreground hover:text-foreground inline-flex size-8 items-center justify-center rounded-md transition-colors"
+            aria-label={
+              theme === "dark" ? "Switch to light mode" : "Switch to dark mode"
+            }
+          >
+            {theme === "dark" ? (
+              <Sun className="size-4" />
+            ) : (
+              <Moon className="size-4" />
+            )}
+          </button>
+          <UserMenu />
+        </div>
+      </div>
+      <hr />
 
       <FlutterView
         state={flutterState}
@@ -81,6 +140,15 @@ function RouteComponent() {
         className="overflow-hidden"
         height={flutterHeight}
       />
+
+      <ItemFormDrawer
+        open={drawerOpen}
+        onOpenChange={handleDrawerOpenChange}
+        timelineId={timelineId}
+        groups={timeline.groups}
+        groupOrder={timeline.groupOrder}
+        editItem={editItem}
+      />
     </div>
   );
 }

apps/web/src/routes/timelines.tsx

@@ -1,24 +0,0 @@
-import { createFileRoute } from "@tanstack/react-router";
-import { useSuspenseQuery } from "@tanstack/react-query";
-import { timelinesQueryOptions } from "@/functions/get-timelines";
-
-export const Route = createFileRoute("/timelines")({
-  loader: async ({ context }) => {
-    await context.queryClient.ensureQueryData(timelinesQueryOptions());
-  },
-  component: RouteComponent,
-});
-
-function RouteComponent() {
-  const timelinesQuery = useSuspenseQuery(timelinesQueryOptions());
-  return (
-    <div>
-      <h1>List of timelines</h1>
-      <div>
-        {timelinesQuery.data.map((t) => (
-          <div key={t.id}>{t.title}</div>
-        ))}
-      </div>
-    </div>
-  );
-}

apps/web/vite.config.ts

@@ -5,8 +5,19 @@ import { defineConfig } from "vite";
 import tsconfigPaths from "vite-tsconfig-paths";
 
 export default defineConfig({
-  plugins: [tsconfigPaths(), tailwindcss(), tanstackStart(), viteReact()],
+  plugins: [
+    tsconfigPaths(),
+    tailwindcss(),
+    tanstackStart({
+      server: { entry: "./entry-server.ts" },
+    }),
+    viteReact(),
+  ],
   server: {
     port: 3001,
+    headers: {
+      "Cross-Origin-Embedder-Policy": "credentialless",
+      "Cross-Origin-Opener-Policy": "same-origin",
+    },
   },
 });

packages/db/src/scripts/fix-lanes.ts

@@ -24,7 +24,7 @@ interface ItemForLane {
 }
 
 function assignLane(
-  existing: ItemForLane[],
+  existing: Array<ItemForLane>,
   newStart: Date,
   newEnd: Date | null
 ): number {
@@ -57,7 +57,7 @@ async function main() {
 
     if (items.length === 0) continue;
 
-    const assigned: ItemForLane[] = [];
+    const assigned: Array<ItemForLane> = [];
     let updated = 0;
 
     for (const item of items) {

packages/z-flutter/lib/main.dart

@@ -125,6 +125,14 @@ class _MainAppState extends State<MainApp> {
     return (start: earliest.subtract(padding), end: latest.add(padding));
   }
 
+  void _onEntrySelected(TimelineEntry entry) {
+    emitEvent('item_selected', {'itemId': entry.id});
+  }
+
+  void _onBackgroundTap() {
+    emitEvent('item_deselected');
+  }
+
   void _onEntryMoved(
     TimelineEntry entry,
     DateTime newStart,
@@ -169,6 +177,47 @@ class _MainAppState extends State<MainApp> {
     });
   }
 
+  void _onEntryResized(
+    TimelineEntry entry,
+    DateTime newStart,
+    DateTime newEnd,
+    int newLane,
+  ) {
+    // Optimistic update -- apply locally before the host round-trips.
+    if (_state case final state?) {
+      final oldItem = state.items[entry.id];
+      if (oldItem != null) {
+        final updatedItems = Map<String, TimelineItemData>.of(state.items);
+        updatedItems[entry.id] = TimelineItemData(
+          id: oldItem.id,
+          groupId: oldItem.groupId,
+          title: oldItem.title,
+          description: oldItem.description,
+          start: newStart.toIso8601String(),
+          end: entry.hasEnd ? newEnd.toIso8601String() : null,
+          lane: newLane,
+        );
+        final updatedState = TimelineState(
+          timeline: state.timeline,
+          groups: state.groups,
+          items: updatedItems,
+          groupOrder: state.groupOrder,
+          selectedItemId: state.selectedItemId,
+          darkMode: state.darkMode,
+        );
+        _applyState(updatedState);
+      }
+    }
+
+    emitEvent('entry_resized', <String, Object?>{
+      'entryId': entry.id,
+      'newStart': newStart.toIso8601String(),
+      'newEnd': entry.hasEnd ? newEnd.toIso8601String() : null,
+      'groupId': entry.groupId,
+      'lane': newLane,
+    });
+  }
+
   void _emitContentHeight() {
     // Start with the fixed chrome heights.
     var totalHeight = _tieredHeaderHeight + _breadcrumbHeight;
@@ -213,6 +262,74 @@ class _MainAppState extends State<MainApp> {
     return _groupColors[groupIndex % _groupColors.length];
   }
 
+  static const _months = [
+    'Jan',
+    'Feb',
+    'Mar',
+    'Apr',
+    'May',
+    'Jun',
+    'Jul',
+    'Aug',
+    'Sep',
+    'Oct',
+    'Nov',
+    'Dec',
+  ];
+
+  String _formatDate(DateTime d) {
+    return '${_months[d.month - 1]} ${d.day}, ${d.year}';
+  }
+
+  String _formatDateRange(DateTime start, DateTime? end) {
+    final s = _formatDate(start);
+    if (end == null) return s;
+    final e = _formatDate(end);
+    return s == e ? s : '$s – $e';
+  }
+
+  Widget? _buildPopoverContent(String entryId) {
+    final item = _state?.items[entryId];
+    if (item == null) return null;
+
+    final start = DateTime.parse(item.start);
+    final end = item.end != null ? DateTime.parse(item.end!) : null;
+
+    return Column(
+      mainAxisSize: MainAxisSize.min,
+      crossAxisAlignment: CrossAxisAlignment.start,
+      children: [
+        Text(
+          item.title,
+          style: const TextStyle(fontWeight: FontWeight.bold, fontSize: 13),
+          maxLines: 1,
+          overflow: TextOverflow.ellipsis,
+        ),
+        if (item.description != null && item.description!.isNotEmpty) ...[
+          const SizedBox(height: 4),
+          Text(
+            item.description!,
+            style: const TextStyle(fontSize: 12),
+            maxLines: 2,
+            overflow: TextOverflow.ellipsis,
+          ),
+        ],
+        const SizedBox(height: 4),
+        Text(
+          _formatDateRange(start, end),
+          style: TextStyle(fontSize: 11, color: Colors.grey[400]),
+        ),
+      ],
+    );
+  }
+
+  Widget _buildCompactDate(DateTime start, DateTime end) {
+    return Text(
+      _formatDateRange(start, end),
+      style: const TextStyle(fontSize: 12, fontWeight: FontWeight.w500),
+    );
+  }
+
   @override
   Widget build(BuildContext context) {
     final viewport = _viewport;
@@ -228,12 +345,16 @@ class _MainAppState extends State<MainApp> {
             ? const Center(child: Text('Waiting for state...'))
             : ZTimelineScope(
                 viewport: viewport,
+                child: EntryPopoverOverlay(
+                  popoverContentBuilder: _buildPopoverContent,
+                  compactDateBuilder: _buildCompactDate,
                   child: Column(
                     children: [
                       const ZTimelineBreadcrumb(),
                       const ZTimelineTieredHeader(),
                       Expanded(
                         child: ZTimelineInteractor(
+                          onBackgroundTap: _onBackgroundTap,
                           child: ZTimelineView(
                             groups: _groups,
                             entries: _entries,
@@ -242,6 +363,9 @@ class _MainAppState extends State<MainApp> {
                             colorBuilder: _colorForEntry,
                             enableDrag: true,
                             onEntryMoved: _onEntryMoved,
+                            onEntryResized: _onEntryResized,
+                            onEntrySelected: _onEntrySelected,
+                            selectedEntryId: _state?.selectedItemId,
                           ),
                         ),
                       ),
@@ -249,6 +373,7 @@ class _MainAppState extends State<MainApp> {
                   ),
                 ),
               ),
+      ),
     );
   }
 }

packages/z-flutter/package.json

@@ -3,6 +3,6 @@
   "version": "1.0.0",
   "private": true,
   "scripts": {
-    "build": "flutter build web --release --wasm --base-href /flutter/ && node scripts/copy-build.mjs"
+    "build": "flutter build web --release --wasm --base-href /flutter/ --source-maps && node scripts/copy-build.mjs"
   }
 }

packages/z-flutter/packages/z_timeline/lib/src/constants.dart

@@ -4,8 +4,20 @@ import 'package:flutter/material.dart';
 class ZTimelineConstants {
   const ZTimelineConstants._();
 
+  // Pill body
+  static const double pillInnerBorderWidth = 1.0;
+  static const double pillContentHeight = 16.0; // labelMedium line height
+
+  // Computed pill height (single source of truth for lane height)
+  // pillPadding.vertical (6.0 * 2 = 12.0) inlined because EdgeInsets
+  // getters are not compile-time constants.
+  static const double pillHeight =
+      pillInnerBorderWidth * 2 +
+          12.0 + // pillPadding.vertical
+          pillContentHeight; // = 30.0
+
   // Heights
-  static const double laneHeight = 28.0;
+  static const double laneHeight = pillHeight;
   static const double groupHeaderHeight = 34.0;
 
   // Spacing
@@ -19,6 +31,15 @@ class ZTimelineConstants {
     vertical: 6.0,
   );
 
+  // Point events (hasEnd == false)
+  static const double pointEventCircleDiameter = 12.0;
+  static const double pointEventCircleTextGap = 6.0;
+  static const double pointEventTextGap = 8.0;
+
+  // Resize handles
+  static const double resizeHandleWidth = 6.0;
+  static const Duration minResizeDuration = Duration(hours: 1);
+
   // Content width
   static const double minContentWidth = 1200.0;
 }

packages/z-flutter/packages/z_timeline/lib/src/models/entry_resize_state.dart

@@ -0,0 +1,88 @@
+import 'package:flutter/foundation.dart';
+
+import 'timeline_entry.dart';
+
+/// Which edge of the pill is being resized.
+enum ResizeEdge { start, end }
+
+/// Immutable state tracking during resize operations.
+///
+/// Captures the entry being resized, which edge, and the target bounds.
+@immutable
+class EntryResizeState {
+  const EntryResizeState({
+    required this.entryId,
+    required this.originalEntry,
+    required this.edge,
+    required this.targetStart,
+    required this.targetEnd,
+    required this.targetLane,
+  });
+
+  /// The ID of the entry being resized.
+  final String entryId;
+
+  /// The original entry (for reverting / reference).
+  final TimelineEntry originalEntry;
+
+  /// Which edge the user is dragging.
+  final ResizeEdge edge;
+
+  /// The current target start time.
+  final DateTime targetStart;
+
+  /// The current target end time.
+  final DateTime targetEnd;
+
+  /// The resolved lane (collision-aware).
+  final int targetLane;
+
+  EntryResizeState copyWith({
+    String? entryId,
+    TimelineEntry? originalEntry,
+    ResizeEdge? edge,
+    DateTime? targetStart,
+    DateTime? targetEnd,
+    int? targetLane,
+  }) {
+    return EntryResizeState(
+      entryId: entryId ?? this.entryId,
+      originalEntry: originalEntry ?? this.originalEntry,
+      edge: edge ?? this.edge,
+      targetStart: targetStart ?? this.targetStart,
+      targetEnd: targetEnd ?? this.targetEnd,
+      targetLane: targetLane ?? this.targetLane,
+    );
+  }
+
+  @override
+  bool operator ==(Object other) {
+    if (identical(this, other)) return true;
+    return other is EntryResizeState &&
+        other.entryId == entryId &&
+        other.originalEntry == originalEntry &&
+        other.edge == edge &&
+        other.targetStart == targetStart &&
+        other.targetEnd == targetEnd &&
+        other.targetLane == targetLane;
+  }
+
+  @override
+  int get hashCode => Object.hash(
+    entryId,
+    originalEntry,
+    edge,
+    targetStart,
+    targetEnd,
+    targetLane,
+  );
+
+  @override
+  String toString() =>
+      'EntryResizeState('
+      'entryId: $entryId, '
+      'edge: $edge, '
+      'targetStart: $targetStart, '
+      'targetEnd: $targetEnd, '
+      'targetLane: $targetLane)';
+}

packages/z-flutter/packages/z_timeline/lib/src/models/interaction_state.dart

@@ -9,22 +9,27 @@ class ZTimelineInteractionState {
   const ZTimelineInteractionState({
     this.isGrabbing = false,
     this.isDraggingEntry = false,
+    this.isResizingEntry = false,
   });
 
   /// Whether the user is actively panning (for cursor feedback).
   final bool isGrabbing;
 
   /// Whether an entry is being dragged (disables pan gesture).
-  /// This will be used by future drag-and-drop functionality.
   final bool isDraggingEntry;
 
+  /// Whether an entry is being resized (disables pan gesture).
+  final bool isResizingEntry;
+
   ZTimelineInteractionState copyWith({
     bool? isGrabbing,
     bool? isDraggingEntry,
+    bool? isResizingEntry,
   }) {
     return ZTimelineInteractionState(
       isGrabbing: isGrabbing ?? this.isGrabbing,
       isDraggingEntry: isDraggingEntry ?? this.isDraggingEntry,
+      isResizingEntry: isResizingEntry ?? this.isResizingEntry,
     );
   }
 
@@ -33,9 +38,10 @@ class ZTimelineInteractionState {
     if (identical(this, other)) return true;
     return other is ZTimelineInteractionState &&
         other.isGrabbing == isGrabbing &&
-        other.isDraggingEntry == isDraggingEntry;
+        other.isDraggingEntry == isDraggingEntry &&
+        other.isResizingEntry == isResizingEntry;
   }
 
   @override
-  int get hashCode => Object.hash(isGrabbing, isDraggingEntry);
+  int get hashCode => Object.hash(isGrabbing, isDraggingEntry, isResizingEntry);
 }

packages/z-flutter/packages/z_timeline/lib/src/models/projected_entry.dart

@@ -1,37 +0,0 @@
-import 'package:flutter/foundation.dart';
-import 'timeline_entry.dart';
-
-/// Represents a projected entry on the timeline.
-/// This is used to represent an entry on the timeline in a normalized space.
-/// The startX and endX are normalized in [0, 1] and represent the position of
-/// the entry on the timeline.
-/// The widthX is the width of the entry in the normalized space.
-@immutable
-class ProjectedEntry {
-  const ProjectedEntry({
-    required this.entry,
-    required this.startX,
-    required this.endX,
-  }) : assert(startX <= endX, 'Projected startX must be <= endX');
-
-  final TimelineEntry entry;
-  final double startX; // normalized in [0, 1]
-  final double endX; // normalized in [0, 1]
-
-  double get widthX => (endX - startX).clamp(0.0, 1.0);
-
-  @override
-  int get hashCode => Object.hash(entry, startX, endX);
-
-  @override
-  bool operator ==(Object other) {
-    return other is ProjectedEntry &&
-        other.entry == entry &&
-        other.startX == startX &&
-        other.endX == endX;
-  }
-
-  @override
-  String toString() =>
-      'ProjectedEntry(entry: ${entry.id}, startX: $startX, endX: $endX)';
-}

packages/z-flutter/packages/z_timeline/lib/src/services/layout_coordinate_service.dart

@@ -10,7 +10,7 @@ import '../constants.dart';
 /// The timeline uses two coordinate spaces:
 ///
 /// 1. **Normalized** `[0.0, 1.0]`: Position relative to the time domain.
-///    Used by [TimeScaleService] and stored in [ProjectedEntry].
+///    Computed via [TimeScaleService].
 ///
 /// 2. **Widget** `[0.0, contentWidth]`: Pixel space inside the timeline.
 ///    What gets passed to [Positioned] widgets.
@@ -35,8 +35,7 @@ class LayoutCoordinateService {
     required double normalizedWidth,
     required double contentWidth,
   }) {
-    return (normalizedWidth * contentWidth)
-        .clamp(0.0, double.infinity);
+    return (normalizedWidth * contentWidth).clamp(0.0, double.infinity);
   }
 
   // ─────────────────────────────────────────────────────────────────────────
@@ -62,8 +61,7 @@ class LayoutCoordinateService {
     required double widgetX,
     required double contentWidth,
   }) {
-    final adjustedX =
-        (widgetX).clamp(0.0, contentWidth);
+    final adjustedX = (widgetX).clamp(0.0, contentWidth);
     return contentWidth == 0 ? 0.0 : adjustedX / contentWidth;
   }
 
@@ -75,10 +73,7 @@ class LayoutCoordinateService {
   ///
   /// Used by all positioned elements (pills, ghost overlay) within the
   /// timeline Stack. Lanes are 1-indexed, so lane 1 starts at Y=0.
-  static double laneToY({
-    required int lane,
-    required double laneHeight,
-  }) {
+  static double laneToY({required int lane, required double laneHeight}) {
     return (lane - 1) * (laneHeight + ZTimelineConstants.laneVerticalSpacing);
   }
 
@@ -86,10 +81,7 @@ class LayoutCoordinateService {
   ///
   /// Used by drop targets to determine which lane the cursor is over.
   /// The Y coordinate should be relative to the timeline Stack.
-  static int yToLane({
-    required double y,
-    required double laneHeight,
-  }) {
+  static int yToLane({required double y, required double laneHeight}) {
     final laneStep = laneHeight + ZTimelineConstants.laneVerticalSpacing;
     return (y / laneStep).floor() + 1;
   }

packages/z-flutter/packages/z_timeline/lib/src/services/tiered_tick_service.dart

@@ -286,8 +286,10 @@ class TieredTickService {
 
     // Start one period before to ensure we cover partial sections at the edge
     var current = alignToUnit(startUtc, unit);
-    final oneBeforeStart =
-        alignToUnit(current.subtract(const Duration(milliseconds: 1)), unit);
+    final oneBeforeStart = alignToUnit(
+      current.subtract(const Duration(milliseconds: 1)),
+      unit,
+    );
     current = oneBeforeStart;
 
     while (current.isBefore(endUtc)) {

packages/z-flutter/packages/z_timeline/lib/src/services/timeline_group_registry.dart

@@ -0,0 +1,112 @@
+import 'package:flutter/widgets.dart';
+
+import '../constants.dart';
+
+/// Result of a hit test against registered groups.
+class GroupHitResult {
+  const GroupHitResult({required this.groupId, required this.localPosition});
+
+  /// The ID of the group that was hit.
+  final String groupId;
+
+  /// The position relative to the group's lanes area.
+  final Offset localPosition;
+}
+
+/// Registration data for a timeline group's lanes area.
+class _GroupRegistration {
+  const _GroupRegistration({
+    required this.key,
+    required this.verticalOffset,
+    required this.lanesCount,
+    required this.laneHeight,
+    required this.contentWidth,
+    this.headerHeight = 0,
+  });
+
+  final GlobalKey key;
+  final double verticalOffset;
+  final int lanesCount;
+  final double laneHeight;
+  final double contentWidth;
+  final double headerHeight;
+}
+
+/// Registry for timeline group lane areas, enabling cross-group hit detection.
+///
+/// Each group registers its lanes area [GlobalKey] so that during drag
+/// operations we can determine which group contains a given global position
+/// without relying on Flutter's [DragTarget] system.
+class TimelineGroupRegistry {
+  final _groups = <String, _GroupRegistration>{};
+
+  /// Register a group's lanes area.
+  void register(
+    String groupId,
+    GlobalKey key, {
+    required double verticalOffset,
+    required int lanesCount,
+    required double laneHeight,
+    required double contentWidth,
+    double headerHeight = 0,
+  }) {
+    _groups[groupId] = _GroupRegistration(
+      key: key,
+      verticalOffset: verticalOffset,
+      lanesCount: lanesCount,
+      laneHeight: laneHeight,
+      contentWidth: contentWidth,
+      headerHeight: headerHeight,
+    );
+  }
+
+  /// Unregister a group.
+  void unregister(String groupId) {
+    _groups.remove(groupId);
+  }
+
+  /// Hit test against all registered groups.
+  ///
+  /// Returns the group whose lanes area contains [globalPosition],
+  /// along with the local position within that lanes area.
+  GroupHitResult? hitTest(Offset globalPosition) {
+    for (final entry in _groups.entries) {
+      final reg = entry.value;
+      final renderBox =
+          reg.key.currentContext?.findRenderObject() as RenderBox?;
+      if (renderBox == null || !renderBox.attached) continue;
+
+      final local = renderBox.globalToLocal(globalPosition);
+      final adjustedY = local.dy - reg.verticalOffset;
+
+      // Check horizontal bounds
+      if (local.dx < 0 || local.dx > reg.contentWidth) continue;
+
+      // Check vertical bounds: extend upward by headerHeight to cover
+      // the group header dead zone, and allow one extra lane for expansion.
+      if (adjustedY < -reg.headerHeight) continue;
+      final maxLanes = (reg.lanesCount <= 0 ? 1 : reg.lanesCount) + 1;
+      final maxY =
+          maxLanes * (reg.laneHeight + ZTimelineConstants.laneVerticalSpacing);
+      if (adjustedY > maxY) continue;
+
+      // Clamp negative values (pointer over header) to top of lanes area.
+      final clampedY = adjustedY < 0 ? 0.0 : adjustedY;
+
+      return GroupHitResult(
+        groupId: entry.key,
+        localPosition: Offset(local.dx, clampedY),
+      );
+    }
+    return null;
+  }
+
+  /// Get the lane height for a registered group.
+  double? laneHeightFor(String groupId) => _groups[groupId]?.laneHeight;
+
+  /// Get the content width for a registered group.
+  double? contentWidthFor(String groupId) => _groups[groupId]?.contentWidth;
+
+  /// Get the lanes count for a registered group.
+  int? lanesCountFor(String groupId) => _groups[groupId]?.lanesCount;
+}

packages/z-flutter/packages/z_timeline/lib/src/services/timeline_projection_service.dart

@@ -1,42 +0,0 @@
-import '../models/timeline_entry.dart';
-import '../models/projected_entry.dart';
-import 'time_scale_service.dart';
-
-class TimelineProjectionService {
-  const TimelineProjectionService();
-
-  Map<String, List<ProjectedEntry>> project({
-    required Iterable<TimelineEntry> entries,
-    required DateTime domainStart,
-    required DateTime domainEnd,
-  }) {
-    final byGroup = <String, List<ProjectedEntry>>{};
-    for (final e in entries) {
-      if (e.overlaps(domainStart, domainEnd)) {
-        final startX = TimeScaleService.mapTimeToPosition(
-          e.start.isBefore(domainStart) ? domainStart : e.start,
-          domainStart,
-          domainEnd,
-        ).clamp(0.0, 1.0);
-        final endX = TimeScaleService.mapTimeToPosition(
-          e.end.isAfter(domainEnd) ? domainEnd : e.end,
-          domainStart,
-          domainEnd,
-        ).clamp(0.0, 1.0);
-
-        final pe = ProjectedEntry(entry: e, startX: startX, endX: endX);
-        (byGroup[e.groupId] ??= <ProjectedEntry>[]).add(pe);
-      }
-    }
-
-    // Keep original order stable by lane then startX
-    for (final list in byGroup.values) {
-      list.sort((a, b) {
-        final laneCmp = a.entry.lane.compareTo(b.entry.lane);
-        if (laneCmp != 0) return laneCmp;
-        return a.startX.compareTo(b.startX);
-      });
-    }
-    return byGroup;
-  }
-}

packages/z-flutter/packages/z_timeline/lib/src/state/timeline_interaction_notifier.dart

@@ -1,6 +1,9 @@
+import 'dart:ui';
+
 import 'package:flutter/foundation.dart';
 
 import '../models/entry_drag_state.dart';
+import '../models/entry_resize_state.dart';
 import '../models/interaction_state.dart';
 import '../models/timeline_entry.dart';
 
@@ -13,6 +16,14 @@ class ZTimelineInteractionNotifier extends ChangeNotifier {
 
   ZTimelineInteractionState _state = const ZTimelineInteractionState();
   EntryDragState? _dragState;
+  EntryResizeState? _resizeState;
+
+  // -- Hover state --
+  String? _hoveredEntryId;
+  Rect? _hoveredPillGlobalRect;
+
+  // -- Interaction cursor position (during drag/resize) --
+  Offset? _interactionGlobalPosition;
 
   /// The current interaction state.
   ZTimelineInteractionState get state => _state;
@@ -20,12 +31,52 @@ class ZTimelineInteractionNotifier extends ChangeNotifier {
   /// The current drag state, or null if no drag is active.
   EntryDragState? get dragState => _dragState;
 
+  /// The current resize state, or null if no resize is active.
+  EntryResizeState? get resizeState => _resizeState;
+
   /// Whether the user is actively panning (for cursor feedback).
   bool get isGrabbing => _state.isGrabbing;
 
   /// Whether an entry is being dragged (disables pan gesture).
   bool get isDraggingEntry => _state.isDraggingEntry;
 
+  /// Whether an entry is being resized.
+  bool get isResizingEntry => _state.isResizingEntry;
+
+  /// Whether any entry interaction (drag or resize) is active.
+  bool get isInteracting => isDraggingEntry || isResizingEntry;
+
+  /// The currently hovered entry ID, or null.
+  String? get hoveredEntryId => _hoveredEntryId;
+
+  /// The global rect of the hovered pill, or null.
+  Rect? get hoveredPillGlobalRect => _hoveredPillGlobalRect;
+
+  /// The global cursor position during drag/resize, or null.
+  Offset? get interactionGlobalPosition => _interactionGlobalPosition;
+
+  /// Set the hovered entry and its global rect.
+  void setHoveredEntry(String id, Rect globalRect) {
+    if (_hoveredEntryId == id && _hoveredPillGlobalRect == globalRect) return;
+    _hoveredEntryId = id;
+    _hoveredPillGlobalRect = globalRect;
+    notifyListeners();
+  }
+
+  /// Clear the hovered entry.
+  void clearHoveredEntry() {
+    if (_hoveredEntryId == null) return;
+    _hoveredEntryId = null;
+    _hoveredPillGlobalRect = null;
+    notifyListeners();
+  }
+
+  /// Update the cursor position during drag/resize.
+  void updateInteractionPosition(Offset globalPosition) {
+    _interactionGlobalPosition = globalPosition;
+    notifyListeners();
+  }
+
   /// Update the grabbing state.
   void setGrabbing(bool value) {
     if (_state.isGrabbing == value) return;
@@ -43,7 +94,10 @@ class ZTimelineInteractionNotifier extends ChangeNotifier {
   /// Begin dragging an entry.
   ///
   /// Sets drag state and marks [isDraggingEntry] as true.
+  /// Clears hover state since the user is now dragging.
   void beginDrag(TimelineEntry entry) {
+    _hoveredEntryId = null;
+    _hoveredPillGlobalRect = null;
     _dragState = EntryDragState(
       entryId: entry.id,
       originalEntry: entry,
@@ -76,17 +130,56 @@ class ZTimelineInteractionNotifier extends ChangeNotifier {
   /// End the drag and clear state.
   void endDrag() {
     _dragState = null;
+    _interactionGlobalPosition = null;
     setDraggingEntry(false);
   }
 
   /// Cancel the drag (alias for [endDrag]).
   void cancelDrag() => endDrag();
 
-  /// Called by drag-drop system when an entry drag starts.
-  @Deprecated('Use beginDrag instead')
-  void beginEntryDrag() => setDraggingEntry(true);
+  /// Begin resizing an entry edge.
+  ///
+  /// Clears hover state since the user is now resizing.
+  void beginResize(TimelineEntry entry, ResizeEdge edge) {
+    _hoveredEntryId = null;
+    _hoveredPillGlobalRect = null;
+    _resizeState = EntryResizeState(
+      entryId: entry.id,
+      originalEntry: entry,
+      edge: edge,
+      targetStart: entry.start,
+      targetEnd: entry.end,
+      targetLane: entry.lane,
+    );
+    _state = _state.copyWith(isResizingEntry: true);
+    notifyListeners();
+  }
 
-  /// Called by drag-drop system when an entry drag ends.
-  @Deprecated('Use endDrag instead')
-  void endEntryDrag() => setDraggingEntry(false);
+  /// Update the resize target times and optional lane.
+  void updateResizeTarget({
+    required DateTime targetStart,
+    required DateTime targetEnd,
+    int? targetLane,
+  }) {
+    if (_resizeState == null) return;
+    final newState = _resizeState!.copyWith(
+      targetStart: targetStart,
+      targetEnd: targetEnd,
+      targetLane: targetLane,
+    );
+    if (newState == _resizeState) return;
+    _resizeState = newState;
+    notifyListeners();
+  }
+
+  /// End the resize and clear state.
+  void endResize() {
+    _resizeState = null;
+    _interactionGlobalPosition = null;
+    _state = _state.copyWith(isResizingEntry: false);
+    notifyListeners();
+  }
+
+  /// Cancel the resize (alias for [endResize]).
+  void cancelResize() => endResize();
 }

packages/z-flutter/packages/z_timeline/lib/src/widgets/breadcrumb_segment_chip.dart

@@ -29,7 +29,9 @@ class BreadcrumbSegmentChip extends StatelessWidget {
       duration: const Duration(milliseconds: 200),
       child: AnimatedSize(
         duration: const Duration(milliseconds: 200),
-        child: segment.isVisible ? _buildChip(context) : const SizedBox.shrink(),
+        child: segment.isVisible
+            ? _buildChip(context)
+            : const SizedBox.shrink(),
       ),
     );
   }
@@ -45,14 +47,16 @@ class BreadcrumbSegmentChip extends StatelessWidget {
         child: Container(
           padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 4),
           decoration: BoxDecoration(
-            border: Border.all(color: colorScheme.outline.withValues(alpha: 0.5)),
+            border: Border.all(
+              color: colorScheme.outline.withValues(alpha: 0.5),
+            ),
             borderRadius: BorderRadius.circular(4),
           ),
           child: Text(
             segment.label,
-            style: Theme.of(context).textTheme.bodySmall?.copyWith(
-              color: colorScheme.onSurface,
-            ),
+            style: Theme.of(
+              context,
+            ).textTheme.bodySmall?.copyWith(color: colorScheme.onSurface),
           ),
         ),
       ),

packages/z-flutter/packages/z_timeline/lib/src/widgets/drag_preview.dart

@@ -1,77 +1,82 @@
 import 'package:flutter/material.dart';
 
-import '../constants.dart';
-import '../models/entry_drag_state.dart';
 import '../services/layout_coordinate_service.dart';
 import '../services/time_scale_service.dart';
 import '../state/timeline_viewport_notifier.dart';
+import 'event_pill.dart';
+import 'event_point.dart';
 
-/// A semi-transparent ghost overlay showing where an entry will land.
+/// A preview overlay showing where an entry will land during drag/resize.
 ///
-/// Displayed during drag operations to give visual feedback about the
-/// target position.
-class GhostOverlay extends StatelessWidget {
-  const GhostOverlay({
-    required this.dragState,
+/// Renders the actual [EventPill] or [EventPoint] at full opacity so the
+/// preview looks identical to the real item.
+class DragPreview extends StatelessWidget {
+  const DragPreview({
+    required this.targetStart,
+    required this.targetEnd,
+    required this.targetLane,
     required this.viewport,
     required this.contentWidth,
     required this.laneHeight,
+    required this.color,
+    required this.label,
+    this.hasEnd = true,
     super.key,
   });
 
-  final EntryDragState dragState;
+  final DateTime targetStart;
+  final DateTime targetEnd;
+  final int targetLane;
   final TimelineViewportNotifier viewport;
   final double contentWidth;
   final double laneHeight;
+  final Color color;
+  final String label;
+
+  /// Whether this is a range event. When false, renders [EventPoint].
+  final bool hasEnd;
 
   @override
   Widget build(BuildContext context) {
     final startX = TimeScaleService.mapTimeToPosition(
-      dragState.targetStart,
+      targetStart,
       viewport.start,
       viewport.end,
     );
-    final endX = TimeScaleService.mapTimeToPosition(
-      dragState.targetEnd,
-      viewport.start,
-      viewport.end,
+    final top = LayoutCoordinateService.laneToY(
+      lane: targetLane,
+      laneHeight: laneHeight,
     );
-
-    // Use centralized coordinate service to ensure ghost matches pill layout
     final left = LayoutCoordinateService.normalizedToWidgetX(
       normalizedX: startX,
       contentWidth: contentWidth,
     );
+
+    if (!hasEnd) {
+      return Positioned(
+        left: left.clamp(0.0, double.infinity),
+        top: top,
+        height: laneHeight,
+        child: IgnorePointer(child: EventPoint(color: color, label: label)),
+      );
+    }
+
+    final endX = TimeScaleService.mapTimeToPosition(
+      targetEnd,
+      viewport.start,
+      viewport.end,
+    );
     final width = LayoutCoordinateService.calculateItemWidth(
       normalizedWidth: endX - startX,
       contentWidth: contentWidth,
     );
-    final top = LayoutCoordinateService.laneToY(
-      lane: dragState.targetLane,
-      laneHeight: laneHeight,
-    );
-
-    final scheme = Theme.of(context).colorScheme;
 
     return Positioned(
       left: left.clamp(0.0, double.infinity),
       width: width.clamp(0.0, double.infinity),
       top: top,
       height: laneHeight,
-      child: IgnorePointer(
-        child: Container(
-          decoration: BoxDecoration(
-            color: scheme.primary.withValues(alpha: 0.3),
-            borderRadius: BorderRadius.circular(
-              ZTimelineConstants.pillBorderRadius,
-            ),
-            border: Border.all(
-              color: scheme.primary.withValues(alpha: 0.6),
-              width: 2,
-            ),
-          ),
-        ),
-      ),
+      child: IgnorePointer(child: EventPill(color: color, label: label)),
     );
   }
 }

packages/z-flutter/packages/z_timeline/lib/src/widgets/draggable_event_pill.dart

@@ -1,135 +0,0 @@
-import 'package:flutter/material.dart';
-
-import '../constants.dart';
-import '../models/projected_entry.dart';
-import '../models/timeline_entry.dart';
-import '../services/layout_coordinate_service.dart';
-import 'timeline_scope.dart';
-import 'timeline_view.dart';
-
-/// A draggable event pill widget.
-///
-/// Renders a timeline entry as a pill that can be dragged to move it
-/// to a new position. Uses Flutter's built-in [Draggable] widget.
-class DraggableEventPill extends StatelessWidget {
-  const DraggableEventPill({
-    required this.entry,
-    required this.laneHeight,
-    required this.labelBuilder,
-    required this.colorBuilder,
-    required this.contentWidth,
-    required this.enableDrag,
-    super.key,
-  });
-
-  final ProjectedEntry entry;
-  final double laneHeight;
-  final EntryLabelBuilder labelBuilder;
-  final EntryColorBuilder colorBuilder;
-  final double contentWidth;
-  final bool enableDrag;
-
-  @override
-  Widget build(BuildContext context) {
-    final pill = _buildPill(context);
-
-    // Use centralized coordinate service for consistent positioning
-    final top = LayoutCoordinateService.laneToY(
-      lane: entry.entry.lane,
-      laneHeight: laneHeight,
-    );
-    final left = LayoutCoordinateService.normalizedToWidgetX(
-      normalizedX: entry.startX,
-      contentWidth: contentWidth,
-    );
-    final width = LayoutCoordinateService.calculateItemWidth(
-      normalizedWidth: entry.widthX,
-      contentWidth: contentWidth,
-    );
-
-    final scope = ZTimelineScope.of(context);
-
-    // Wrap pill in a MouseRegion so hovering shows a pointer cursor.
-    // During an active entry drag, defer to the parent cursor (grabbing).
-    final cursorPill = ListenableBuilder(
-      listenable: scope.interaction,
-      builder: (context, child) => MouseRegion(
-        cursor: scope.interaction.isDraggingEntry
-            ? MouseCursor.defer
-            : SystemMouseCursors.click,
-        child: child,
-      ),
-      child: pill,
-    );
-
-    if (!enableDrag) {
-      return Positioned(
-        top: top,
-        left: left.clamp(0.0, double.infinity),
-        width: width.clamp(0.0, double.infinity),
-        height: laneHeight,
-        child: cursorPill,
-      );
-    }
-
-    return Positioned(
-      top: top,
-      left: left.clamp(0.0, double.infinity),
-      width: width.clamp(0.0, double.infinity),
-      height: laneHeight,
-      child: Draggable<TimelineEntry>(
-        data: entry.entry,
-        onDragStarted: () {
-          scope.interaction.beginDrag(entry.entry);
-        },
-        onDraggableCanceled: (_, __) {
-          scope.interaction.cancelDrag();
-        },
-        onDragCompleted: () {
-          // Handled by DragTarget
-        },
-        feedback: DefaultTextStyle(
-          style: Theme.of(context).textTheme.labelMedium ?? const TextStyle(),
-          child: Opacity(
-            opacity: 0.8,
-            child: SizedBox(
-              width: width.clamp(0.0, double.infinity),
-              height: laneHeight,
-              child: pill,
-            ),
-          ),
-        ),
-        childWhenDragging: Opacity(opacity: 0.3, child: pill),
-        child: cursorPill,
-      ),
-    );
-  }
-
-  Widget _buildPill(BuildContext context) {
-    final color = colorBuilder(entry.entry);
-    final onColor =
-        ThemeData.estimateBrightnessForColor(color) == Brightness.dark
-        ? Colors.white
-        : Colors.black87;
-
-    return Container(
-      padding: ZTimelineConstants.pillPadding,
-      decoration: BoxDecoration(
-        color: color,
-        borderRadius: BorderRadius.circular(
-          ZTimelineConstants.pillBorderRadius,
-        ),
-      ),
-      alignment: Alignment.centerLeft,
-      child: Text(
-        labelBuilder(entry.entry),
-        maxLines: 1,
-        overflow: TextOverflow.ellipsis,
-        style: Theme.of(context).textTheme.labelMedium?.copyWith(
-          color: onColor,
-          fontWeight: FontWeight.w400,
-        ),
-      ),
-    );
-  }
-}

packages/z-flutter/packages/z_timeline/lib/src/widgets/entry_popover_overlay.dart

@@ -0,0 +1,346 @@
+import 'dart:math' as math;
+
+import 'package:flutter/material.dart';
+
+import '../state/timeline_interaction_notifier.dart';
+import 'timeline_scope.dart';
+
+/// Builder for full popover content shown on hover.
+///
+/// Return `null` to suppress the popover for a given entry.
+typedef PopoverContentBuilder = Widget? Function(String entryId);
+
+/// Builder for compact date labels shown during drag/resize.
+typedef CompactDateBuilder = Widget Function(DateTime start, DateTime end);
+
+/// Gap between the pill and the popover.
+const double _kPopoverGap = 6.0;
+
+/// Maximum popover width.
+const double _kMaxPopoverWidth = 280.0;
+
+/// Animation duration.
+const Duration _kAnimationDuration = Duration(milliseconds: 120);
+
+/// Wraps a child and manages a single [OverlayEntry] that shows either:
+/// - A hover popover (full card) when the user hovers over a pill.
+/// - A compact date popover near the cursor during drag/resize.
+class EntryPopoverOverlay extends StatefulWidget {
+  const EntryPopoverOverlay({
+    required this.child,
+    this.popoverContentBuilder,
+    this.compactDateBuilder,
+    super.key,
+  });
+
+  final Widget child;
+  final PopoverContentBuilder? popoverContentBuilder;
+  final CompactDateBuilder? compactDateBuilder;
+
+  @override
+  State<EntryPopoverOverlay> createState() => _EntryPopoverOverlayState();
+}
+
+class _EntryPopoverOverlayState extends State<EntryPopoverOverlay> {
+  OverlayEntry? _overlayEntry;
+  ZTimelineInteractionNotifier? _notifier;
+
+  // Track current mode to know when to rebuild.
+  String? _currentHoveredId;
+  bool _currentIsInteracting = false;
+
+  @override
+  void didChangeDependencies() {
+    super.didChangeDependencies();
+    final scope = ZTimelineScope.maybeOf(context);
+    final newNotifier = scope?.interaction;
+
+    if (newNotifier != _notifier) {
+      _notifier?.removeListener(_onInteractionChanged);
+      _notifier = newNotifier;
+      _notifier?.addListener(_onInteractionChanged);
+    }
+  }
+
+  @override
+  void dispose() {
+    _notifier?.removeListener(_onInteractionChanged);
+    _removeOverlay();
+    super.dispose();
+  }
+
+  void _onInteractionChanged() {
+    final notifier = _notifier;
+    if (notifier == null) return;
+
+    final hoveredId = notifier.hoveredEntryId;
+    final isInteracting = notifier.isInteracting;
+    final interactionPos = notifier.interactionGlobalPosition;
+
+    // Determine what we should show.
+    final shouldShowHover =
+        hoveredId != null &&
+        !isInteracting &&
+        widget.popoverContentBuilder != null;
+    final shouldShowCompact =
+        isInteracting &&
+        interactionPos != null &&
+        widget.compactDateBuilder != null;
+
+    if (shouldShowHover) {
+      if (_currentHoveredId != hoveredId || _currentIsInteracting) {
+        _removeOverlay();
+        _currentHoveredId = hoveredId;
+        _currentIsInteracting = false;
+        _showHoverPopover(notifier);
+      }
+    } else if (shouldShowCompact) {
+      if (!_currentIsInteracting) {
+        _removeOverlay();
+        _currentIsInteracting = true;
+        _currentHoveredId = null;
+        _showCompactPopover(notifier);
+      } else {
+        // Just mark dirty to reposition.
+        _overlayEntry?.markNeedsBuild();
+      }
+    } else {
+      if (_overlayEntry != null) {
+        _removeOverlay();
+        _currentHoveredId = null;
+        _currentIsInteracting = false;
+      }
+    }
+  }
+
+  void _showHoverPopover(ZTimelineInteractionNotifier notifier) {
+    _overlayEntry = OverlayEntry(
+      builder: (_) => _HoverPopover(
+        notifier: notifier,
+        contentBuilder: widget.popoverContentBuilder!,
+      ),
+    );
+    Overlay.of(context).insert(_overlayEntry!);
+  }
+
+  void _showCompactPopover(ZTimelineInteractionNotifier notifier) {
+    _overlayEntry = OverlayEntry(
+      builder: (_) => _CompactPopover(
+        notifier: notifier,
+        compactDateBuilder: widget.compactDateBuilder!,
+      ),
+    );
+    Overlay.of(context).insert(_overlayEntry!);
+  }
+
+  void _removeOverlay() {
+    _overlayEntry?.remove();
+    _overlayEntry = null;
+  }
+
+  @override
+  Widget build(BuildContext context) => widget.child;
+}
+
+// ---------------------------------------------------------------------------
+// Hover popover — positioned above the pill rect
+// ---------------------------------------------------------------------------
+
+class _HoverPopover extends StatelessWidget {
+  const _HoverPopover({required this.notifier, required this.contentBuilder});
+
+  final ZTimelineInteractionNotifier notifier;
+  final PopoverContentBuilder contentBuilder;
+
+  @override
+  Widget build(BuildContext context) {
+    final entryId = notifier.hoveredEntryId;
+    final pillRect = notifier.hoveredPillGlobalRect;
+    if (entryId == null || pillRect == null) return const SizedBox.shrink();
+
+    final content = contentBuilder(entryId);
+    if (content == null) return const SizedBox.shrink();
+
+    return _AnimatedPopoverWrapper(
+      child: CustomSingleChildLayout(
+        delegate: _PopoverLayoutDelegate(pillRect: pillRect),
+        child: IgnorePointer(child: _PopoverCard(child: content)),
+      ),
+    );
+  }
+}
+
+// ---------------------------------------------------------------------------
+// Compact popover — positioned near cursor during drag/resize
+// ---------------------------------------------------------------------------
+
+class _CompactPopover extends StatelessWidget {
+  const _CompactPopover({
+    required this.notifier,
+    required this.compactDateBuilder,
+  });
+
+  final ZTimelineInteractionNotifier notifier;
+  final CompactDateBuilder compactDateBuilder;
+
+  @override
+  Widget build(BuildContext context) {
+    final pos = notifier.interactionGlobalPosition;
+    if (pos == null) return const SizedBox.shrink();
+
+    // Determine dates from drag or resize state.
+    DateTime? start;
+    DateTime? end;
+
+    if (notifier.dragState case final drag?) {
+      start = drag.targetStart;
+      final duration = drag.originalEntry.end.difference(
+        drag.originalEntry.start,
+      );
+      end = drag.targetStart.add(duration);
+    } else if (notifier.resizeState case final resize?) {
+      start = resize.targetStart;
+      end = resize.targetEnd;
+    }
+
+    if (start == null || end == null) return const SizedBox.shrink();
+
+    return _AnimatedPopoverWrapper(
+      child: CustomSingleChildLayout(
+        delegate: _CursorPopoverDelegate(cursorPosition: pos),
+        child: IgnorePointer(
+          child: _PopoverCard(
+            compact: true,
+            child: compactDateBuilder(start, end),
+          ),
+        ),
+      ),
+    );
+  }
+}
+
+// ---------------------------------------------------------------------------
+// Layout delegates
+// ---------------------------------------------------------------------------
+
+/// Positions the popover above the pill, flipping below if not enough room.
+/// Clamps horizontally to screen bounds.
+class _PopoverLayoutDelegate extends SingleChildLayoutDelegate {
+  _PopoverLayoutDelegate({required this.pillRect});
+
+  final Rect pillRect;
+
+  @override
+  BoxConstraints getConstraintsForChild(BoxConstraints constraints) {
+    return BoxConstraints(
+      maxWidth: math.min(_kMaxPopoverWidth, constraints.maxWidth - 16),
+      maxHeight: constraints.maxHeight * 0.4,
+    );
+  }
+
+  @override
+  Offset getPositionForChild(Size size, Size childSize) {
+    // Try above first.
+    final aboveY = pillRect.top - _kPopoverGap - childSize.height;
+    final belowY = pillRect.bottom + _kPopoverGap;
+    final y = aboveY >= 8 ? aboveY : belowY;
+
+    // Center on pill horizontally, clamped to screen.
+    final idealX = pillRect.center.dx - childSize.width / 2;
+    final x = idealX.clamp(8.0, size.width - childSize.width - 8);
+
+    return Offset(x, y);
+  }
+
+  @override
+  bool shouldRelayout(_PopoverLayoutDelegate oldDelegate) {
+    return pillRect != oldDelegate.pillRect;
+  }
+}
+
+/// Positions the compact date label above the cursor.
+class _CursorPopoverDelegate extends SingleChildLayoutDelegate {
+  _CursorPopoverDelegate({required this.cursorPosition});
+
+  final Offset cursorPosition;
+
+  @override
+  BoxConstraints getConstraintsForChild(BoxConstraints constraints) {
+    return BoxConstraints(
+      maxWidth: math.min(_kMaxPopoverWidth, constraints.maxWidth - 16),
+      maxHeight: 60,
+    );
+  }
+
+  @override
+  Offset getPositionForChild(Size size, Size childSize) {
+    const offsetAbove = 24.0;
+    final idealX = cursorPosition.dx - childSize.width / 2;
+    final x = idealX.clamp(8.0, size.width - childSize.width - 8);
+    final y = (cursorPosition.dy - offsetAbove - childSize.height).clamp(
+      8.0,
+      size.height - childSize.height - 8,
+    );
+
+    return Offset(x, y);
+  }
+
+  @override
+  bool shouldRelayout(_CursorPopoverDelegate oldDelegate) {
+    return cursorPosition != oldDelegate.cursorPosition;
+  }
+}
+
+// ---------------------------------------------------------------------------
+// Shared card styling
+// ---------------------------------------------------------------------------
+
+class _PopoverCard extends StatelessWidget {
+  const _PopoverCard({required this.child, this.compact = false});
+
+  final Widget child;
+  final bool compact;
+
+  @override
+  Widget build(BuildContext context) {
+    final theme = Theme.of(context);
+
+    return Material(
+      elevation: 4,
+      borderRadius: BorderRadius.circular(8),
+      color: theme.colorScheme.surfaceContainer,
+      child: Padding(
+        padding: compact
+            ? const EdgeInsets.symmetric(horizontal: 10, vertical: 6)
+            : const EdgeInsets.all(12),
+        child: child,
+      ),
+    );
+  }
+}
+
+// ---------------------------------------------------------------------------
+// Animation wrapper
+// ---------------------------------------------------------------------------
+
+class _AnimatedPopoverWrapper extends StatelessWidget {
+  const _AnimatedPopoverWrapper({required this.child});
+
+  final Widget child;
+
+  @override
+  Widget build(BuildContext context) {
+    return TweenAnimationBuilder<double>(
+      tween: Tween(begin: 0.0, end: 1.0),
+      duration: _kAnimationDuration,
+      curve: Curves.easeOut,
+      builder: (context, value, child) {
+        return Opacity(
+          opacity: value,
+          child: Transform.scale(scale: 0.95 + 0.05 * value, child: child),
+        );
+      },
+      child: child,
+    );
+  }
+}

packages/z-flutter/packages/z_timeline/lib/src/widgets/event_pill.dart

@@ -0,0 +1,116 @@
+import 'package:flutter/material.dart';
+import 'package:flutter/widget_previews.dart';
+import '../constants.dart';
+
+/// A standalone event pill widget with a tinted gradient background,
+/// colored border, indicator dot, and an outer selection ring.
+class EventPill extends StatefulWidget {
+  const EventPill({
+    required this.color,
+    required this.label,
+    this.isSelected = false,
+    super.key,
+  });
+
+  final Color color;
+  final String label;
+  final bool isSelected;
+
+  @override
+  State<EventPill> createState() => _EventPillState();
+}
+
+class _EventPillState extends State<EventPill> {
+  bool _isHovered = false;
+
+  @override
+  Widget build(BuildContext context) {
+    final color = widget.color;
+    final isSelected = widget.isSelected;
+
+    final double bgAlphaStart =
+        isSelected ? 0.24 : _isHovered ? 0.18 : 0.08;
+    final double bgAlphaEnd =
+        isSelected ? 0.34 : _isHovered ? 0.28 : 0.16;
+
+    return MouseRegion(
+      onEnter: (_) => setState(() => _isHovered = true),
+      onExit: (_) => setState(() => _isHovered = false),
+      child: Container(
+        clipBehavior: Clip.antiAlias,
+        padding: ZTimelineConstants.pillPadding,
+        decoration: BoxDecoration(
+          gradient: LinearGradient(
+            begin: Alignment.topLeft,
+            end: Alignment.bottomRight,
+            colors: [
+              color.withValues(alpha: bgAlphaStart),
+              color.withValues(alpha: bgAlphaEnd),
+            ],
+          ),
+          borderRadius: BorderRadius.circular(999),
+          border: Border.all(
+            color: color,
+            width: ZTimelineConstants.pillInnerBorderWidth,
+          ),
+        ),
+        alignment: Alignment.centerLeft,
+        child: LayoutBuilder(
+          builder: (context, constraints) {
+            if (constraints.maxWidth < 20) return const SizedBox.shrink();
+            return Row(
+              children: [
+                if (isSelected)
+                  Container(
+                    width: 12,
+                    height: 12,
+                    decoration: BoxDecoration(
+                      shape: BoxShape.circle,
+                      border: Border.all(color: color),
+                    ),
+                    alignment: Alignment.center,
+                    child: Container(
+                      width: 8,
+                      height: 8,
+                      decoration: BoxDecoration(
+                          color: color, shape: BoxShape.circle),
+                    ),
+                  )
+                else
+                  Container(
+                    width: 8,
+                    height: 8,
+                    margin: const EdgeInsets.all(2),
+                    decoration: BoxDecoration(
+                        color: color, shape: BoxShape.circle),
+                  ),
+                const SizedBox(width: 8),
+                Expanded(
+                  child: Text(
+                    widget.label,
+                    maxLines: 1,
+                    overflow: TextOverflow.ellipsis,
+                    style: Theme.of(context).textTheme.labelMedium?.copyWith(
+                      color: Theme.of(context).colorScheme.onSurface,
+                      fontWeight: FontWeight.w400,
+                    ),
+                  ),
+                ),
+              ],
+            );
+          },
+        ),
+      ),
+    );
+  }
+}
+
+@Preview(name: 'Event pill', brightness: Brightness.light)
+@Preview(name: 'Event pill', brightness: Brightness.dark)
+Widget eventPillPreview() =>
+    EventPill(color: Colors.blue, label: 'Sample Event', isSelected: false);
+
+@Preview(name: 'Event pill - selected', brightness: Brightness.light)
+@Preview(name: 'Event pill - selected', brightness: Brightness.dark)
+Widget eventPillSelectedPreview() =>
+    EventPill(color: Colors.blue, label: 'Sample Event', isSelected: true);

packages/z-flutter/packages/z_timeline/lib/src/widgets/event_point.dart

@@ -0,0 +1,75 @@
+import 'package:flutter/material.dart';
+
+import '../constants.dart';
+
+/// A point-event widget: small circle with a text label to its right.
+///
+/// Used for entries with [TimelineEntry.hasEnd] == false.
+class EventPoint extends StatelessWidget {
+  const EventPoint({
+    required this.color,
+    required this.label,
+    this.maxTextWidth,
+    this.isSelected = false,
+    super.key,
+  });
+
+  final Color color;
+  final String label;
+  final bool isSelected;
+
+  /// Maximum width for the label text. When provided, text truncates with
+  /// ellipsis. When null the text sizes naturally.
+  final double? maxTextWidth;
+
+  @override
+  Widget build(BuildContext context) {
+    final onColor =
+        ThemeData.estimateBrightnessForColor(color) == Brightness.dark
+            ? Colors.white
+            : Colors.black87;
+
+    final textWidget = Text(
+      label,
+      maxLines: 1,
+      overflow: TextOverflow.ellipsis,
+      style: Theme.of(context).textTheme.labelMedium?.copyWith(
+            color: onColor,
+            fontWeight: FontWeight.w400,
+          ),
+    );
+
+    final showText = maxTextWidth == null || maxTextWidth! > 0;
+
+    return Row(
+      mainAxisSize: MainAxisSize.min,
+      crossAxisAlignment: CrossAxisAlignment.center,
+      children: [
+        Container(
+          width: ZTimelineConstants.pointEventCircleDiameter,
+          height: ZTimelineConstants.pointEventCircleDiameter,
+          decoration: BoxDecoration(
+            color: color,
+            shape: BoxShape.circle,
+            border: isSelected
+                ? Border.all(
+                    color: Theme.of(context).colorScheme.primary,
+                    width: 2,
+                  )
+                : null,
+          ),
+        ),
+        if (showText) ...[
+          const SizedBox(width: ZTimelineConstants.pointEventCircleTextGap),
+          if (maxTextWidth != null)
+            ConstrainedBox(
+              constraints: BoxConstraints(maxWidth: maxTextWidth!),
+              child: textWidget,
+            )
+          else
+            textWidget,
+        ],
+      ],
+    );
+  }
+}

packages/z-flutter/packages/z_timeline/lib/src/widgets/group_drop_target.dart

@@ -1,128 +0,0 @@
-import 'package:flutter/material.dart';
-
-import '../models/projected_entry.dart';
-import '../models/timeline_entry.dart';
-import '../models/timeline_group.dart';
-import '../services/entry_placement_service.dart';
-import '../services/layout_coordinate_service.dart';
-import '../services/time_scale_service.dart';
-import '../state/timeline_viewport_notifier.dart';
-import 'timeline_scope.dart';
-import 'timeline_view.dart';
-
-/// A drop target wrapper for a timeline group.
-///
-/// Wraps group lanes content and handles drag-and-drop operations.
-/// The ghost overlay is rendered by the parent widget in the same Stack.
-class GroupDropTarget extends StatelessWidget {
-  const GroupDropTarget({
-    required this.group,
-    required this.entries,
-    required this.allEntries,
-    required this.viewport,
-    required this.contentWidth,
-    required this.laneHeight,
-    required this.lanesCount,
-    required this.onEntryMoved,
-    required this.child,
-    this.verticalOffset = 0.0,
-    super.key,
-  });
-
-  final TimelineGroup group;
-  final List<ProjectedEntry> entries;
-  final List<TimelineEntry> allEntries;
-  final TimelineViewportNotifier viewport;
-  final double contentWidth;
-  final double laneHeight;
-  final int lanesCount;
-  final OnEntryMoved? onEntryMoved;
-  final Widget child;
-
-  /// Vertical offset from the top of this widget to the top of the lanes area.
-  /// Used to correctly map pointer y-coordinates to lanes when this target
-  /// wraps content above the lanes (e.g. group headers).
-  final double verticalOffset;
-
-  @override
-  Widget build(BuildContext context) {
-    final scope = ZTimelineScope.of(context);
-
-    return DragTarget<TimelineEntry>(
-      builder: (context, candidateData, rejectedData) {
-        return child;
-      },
-      onWillAcceptWithDetails: (details) => true,
-      onMove: (details) {
-        final renderBox = context.findRenderObject() as RenderBox?;
-        if (renderBox == null) return;
-
-        final local = renderBox.globalToLocal(details.offset);
-
-        // Use centralized coordinate service for consistent transformations
-        final ratio = LayoutCoordinateService.widgetXToNormalized(
-          widgetX: local.dx,
-          contentWidth: contentWidth,
-        );
-
-        final targetStart = TimeScaleService.mapPositionToTime(
-          ratio,
-          viewport.start,
-          viewport.end,
-        );
-
-        // Adjust y to account for content above the lanes (e.g. group header)
-        final adjustedY = local.dy - verticalOffset;
-
-        final rawLane = LayoutCoordinateService.yToLane(
-          y: adjustedY,
-          laneHeight: laneHeight,
-        );
-        final maxAllowedLane = (lanesCount <= 0 ? 1 : lanesCount) + 1;
-        final targetLane = rawLane.clamp(1, maxAllowedLane);
-
-        // Resolve with collision avoidance
-        final resolved = EntryPlacementService.resolvePlacement(
-          entry: details.data,
-          targetGroupId: group.id,
-          targetLane: targetLane,
-          targetStart: targetStart,
-          existingEntries: allEntries,
-        );
-
-        scope.interaction.updateDragTarget(
-          targetGroupId: group.id,
-          targetLane: resolved.lane,
-          targetStart: targetStart,
-        );
-      },
-      onAcceptWithDetails: (details) {
-        final dragState = scope.interaction.dragState;
-        if (dragState == null || onEntryMoved == null) {
-          scope.interaction.endDrag();
-          return;
-        }
-
-        final resolved = EntryPlacementService.resolvePlacement(
-          entry: details.data,
-          targetGroupId: dragState.targetGroupId,
-          targetLane: dragState.targetLane,
-          targetStart: dragState.targetStart,
-          existingEntries: allEntries,
-        );
-
-        onEntryMoved!(
-          details.data,
-          dragState.targetStart,
-          dragState.targetGroupId,
-          resolved.lane,
-        );
-
-        scope.interaction.endDrag();
-      },
-      onLeave: (data) {
-        // Don't clear on leave - entry might move to another group
-      },
-    );
-  }
-}

packages/z-flutter/packages/z_timeline/lib/src/widgets/interactive_event_pill.dart

@@ -0,0 +1,602 @@
+import 'package:flutter/material.dart';
+
+import '../constants.dart';
+import '../models/entry_resize_state.dart';
+import '../models/timeline_entry.dart';
+import '../services/entry_placement_service.dart';
+import '../services/layout_coordinate_service.dart';
+import '../services/time_scale_service.dart';
+import '../services/timeline_group_registry.dart';
+import '../state/timeline_viewport_notifier.dart';
+import 'event_pill.dart';
+import 'event_point.dart';
+import 'timeline_scope.dart';
+import 'timeline_view.dart';
+
+/// Interaction mode determined on pan-down.
+enum _InteractionMode { resizeStart, resizeEnd, drag }
+
+/// An interactive event pill that handles both resize and drag-move
+/// with a single [GestureDetector] using pan gestures.
+///
+/// Each pill listens to the [viewport] internally via [AnimatedBuilder],
+/// so only the [Positioned] wrapper updates during pan — the visual
+/// content ([EventPill] / [EventPoint]) is in the `child:` slot and
+/// is NOT rebuilt on every frame.
+class InteractiveEventPill extends StatefulWidget {
+  const InteractiveEventPill({
+    required this.entry,
+    required this.laneHeight,
+    required this.labelBuilder,
+    required this.colorBuilder,
+    required this.contentWidth,
+    required this.enableDrag,
+    required this.viewport,
+    this.allEntries = const [],
+    this.onEntryResized,
+    this.onEntryMoved,
+    this.onEntrySelected,
+    this.selectedEntryId,
+    this.groupRegistry,
+    this.nextEntryInLane,
+    super.key,
+  });
+
+  final TimelineEntry entry;
+  final double laneHeight;
+  final EntryLabelBuilder labelBuilder;
+  final EntryColorBuilder colorBuilder;
+  final double contentWidth;
+  final bool enableDrag;
+  final TimelineViewportNotifier viewport;
+  final List<TimelineEntry> allEntries;
+  final OnEntryResized? onEntryResized;
+  final OnEntryMoved? onEntryMoved;
+  final OnEntrySelected? onEntrySelected;
+  final String? selectedEntryId;
+  final TimelineGroupRegistry? groupRegistry;
+
+  /// Next entry in the same lane, used to compute available width for
+  /// point events.
+  final TimelineEntry? nextEntryInLane;
+
+  @override
+  State<InteractiveEventPill> createState() => _InteractiveEventPillState();
+}
+
+class _InteractiveEventPillState extends State<InteractiveEventPill> {
+  final _pointInteractionKey = GlobalKey();
+  _InteractionMode? _mode;
+  double _cumulativeDx = 0;
+
+  /// Normalized offset from the entry's start to the grab point,
+  /// so dragging doesn't snap the entry start to the cursor.
+  double _grabOffsetNormalized = 0;
+
+  /// Compute pill width from an entry's start/end mapped through the current
+  /// viewport. Shared by [_currentPillWidth] and [_buildRangeEntry] to avoid
+  /// drift between the two code paths.
+  double _pillWidthFromEntry(TimelineEntry entry) {
+    final startX = TimeScaleService.mapTimeToPosition(
+      entry.start,
+      widget.viewport.start,
+      widget.viewport.end,
+    );
+    final endX = TimeScaleService.mapTimeToPosition(
+      entry.end,
+      widget.viewport.start,
+      widget.viewport.end,
+    );
+    return LayoutCoordinateService.calculateItemWidth(
+      normalizedWidth: (endX - startX).clamp(0.0, double.infinity),
+      contentWidth: widget.contentWidth,
+    );
+  }
+
+  /// Compute current pill width from the raw entry + viewport.
+  double get _currentPillWidth => _pillWidthFromEntry(widget.entry);
+
+  _InteractionMode _determineMode(Offset localPosition) {
+    if (!widget.entry.hasEnd) return _InteractionMode.drag;
+
+    final pillWidth = _currentPillWidth;
+    const handleWidth = ZTimelineConstants.resizeHandleWidth;
+
+    if (widget.onEntryResized != null && pillWidth >= 16) {
+      if (localPosition.dx <= handleWidth) {
+        return _InteractionMode.resizeStart;
+      }
+      if (localPosition.dx >= pillWidth - handleWidth) {
+        return _InteractionMode.resizeEnd;
+      }
+    }
+    return _InteractionMode.drag;
+  }
+
+  void _onPanDown(DragDownDetails details) {
+    _mode = _determineMode(details.localPosition);
+    _grabOffsetNormalized = details.localPosition.dx / widget.contentWidth;
+  }
+
+  void _onPanStart(DragStartDetails details) {
+    final scope = ZTimelineScope.of(context);
+    final entry = widget.entry;
+
+    _cumulativeDx = 0;
+
+    // Clear hover as safety net when drag/resize begins.
+    scope.interaction.clearHoveredEntry();
+
+    switch (_mode!) {
+      case _InteractionMode.resizeStart:
+        scope.interaction.beginResize(entry, ResizeEdge.start);
+      case _InteractionMode.resizeEnd:
+        scope.interaction.beginResize(entry, ResizeEdge.end);
+      case _InteractionMode.drag:
+        scope.interaction.beginDrag(entry);
+    }
+  }
+
+  void _onPanUpdate(DragUpdateDetails details) {
+    switch (_mode!) {
+      case _InteractionMode.resizeStart:
+      case _InteractionMode.resizeEnd:
+        _handleResizeUpdate(details);
+      case _InteractionMode.drag:
+        _handleDragUpdate(details);
+    }
+  }
+
+  void _handleResizeUpdate(DragUpdateDetails details) {
+    final scope = ZTimelineScope.of(context);
+    scope.interaction.updateInteractionPosition(details.globalPosition);
+    _cumulativeDx += details.delta.dx;
+
+    final deltaNormalized = _cumulativeDx / widget.contentWidth;
+    final originalEntry = widget.entry;
+    final edge = _mode == _InteractionMode.resizeStart
+        ? ResizeEdge.start
+        : ResizeEdge.end;
+
+    DateTime newStart = originalEntry.start;
+    DateTime newEnd = originalEntry.end;
+
+    if (edge == ResizeEdge.start) {
+      final originalStartNorm = TimeScaleService.mapTimeToPosition(
+        originalEntry.start,
+        widget.viewport.start,
+        widget.viewport.end,
+      );
+      newStart = TimeScaleService.mapPositionToTime(
+        originalStartNorm + deltaNormalized,
+        widget.viewport.start,
+        widget.viewport.end,
+      );
+      final maxStart = newEnd.subtract(ZTimelineConstants.minResizeDuration);
+      if (newStart.isAfter(maxStart)) {
+        newStart = maxStart;
+      }
+    } else {
+      final originalEndNorm = TimeScaleService.mapTimeToPosition(
+        originalEntry.end,
+        widget.viewport.start,
+        widget.viewport.end,
+      );
+      newEnd = TimeScaleService.mapPositionToTime(
+        originalEndNorm + deltaNormalized,
+        widget.viewport.start,
+        widget.viewport.end,
+      );
+      final minEnd = newStart.add(ZTimelineConstants.minResizeDuration);
+      if (newEnd.isBefore(minEnd)) {
+        newEnd = minEnd;
+      }
+    }
+
+    final resolvedLane = EntryPlacementService.findNearestAvailableLane(
+      entryId: originalEntry.id,
+      targetGroupId: originalEntry.groupId,
+      targetLane: originalEntry.lane,
+      targetStart: newStart,
+      targetEnd: newEnd,
+      existingEntries: widget.allEntries,
+    );
+
+    scope.interaction.updateResizeTarget(
+      targetStart: newStart,
+      targetEnd: newEnd,
+      targetLane: resolvedLane,
+    );
+  }
+
+  void _handleDragUpdate(DragUpdateDetails details) {
+    final scope = ZTimelineScope.of(context);
+    scope.interaction.updateInteractionPosition(details.globalPosition);
+    final registry = widget.groupRegistry;
+    if (registry == null) return;
+
+    final hit = registry.hitTest(details.globalPosition);
+    if (hit == null) return;
+
+    final laneHeight = registry.laneHeightFor(hit.groupId) ?? widget.laneHeight;
+    final contentWidth =
+        registry.contentWidthFor(hit.groupId) ?? widget.contentWidth;
+    final lanesCount = registry.lanesCountFor(hit.groupId) ?? 1;
+
+    final ratio = LayoutCoordinateService.widgetXToNormalized(
+      widgetX: hit.localPosition.dx,
+      contentWidth: contentWidth,
+    );
+
+    final targetStart = TimeScaleService.mapPositionToTime(
+      ratio - _grabOffsetNormalized,
+      widget.viewport.start,
+      widget.viewport.end,
+    );
+
+    final rawLane = LayoutCoordinateService.yToLane(
+      y: hit.localPosition.dy,
+      laneHeight: laneHeight,
+    );
+    final maxAllowedLane = (lanesCount <= 0 ? 1 : lanesCount) + 1;
+    final targetLane = rawLane.clamp(1, maxAllowedLane);
+
+    final resolved = EntryPlacementService.resolvePlacement(
+      entry: widget.entry,
+      targetGroupId: hit.groupId,
+      targetLane: targetLane,
+      targetStart: targetStart,
+      existingEntries: widget.allEntries,
+    );
+
+    scope.interaction.updateDragTarget(
+      targetGroupId: hit.groupId,
+      targetLane: resolved.lane,
+      targetStart: targetStart,
+    );
+  }
+
+  void _onPanEnd(DragEndDetails details) {
+    final scope = ZTimelineScope.of(context);
+
+    switch (_mode!) {
+      case _InteractionMode.resizeStart:
+      case _InteractionMode.resizeEnd:
+        final resizeState = scope.interaction.resizeState;
+        if (resizeState != null && widget.onEntryResized != null) {
+          widget.onEntryResized!(
+            resizeState.originalEntry,
+            resizeState.targetStart,
+            resizeState.targetEnd,
+            resizeState.targetLane,
+          );
+        }
+        scope.interaction.endResize();
+      case _InteractionMode.drag:
+        final dragState = scope.interaction.dragState;
+        if (dragState != null && widget.onEntryMoved != null) {
+          widget.onEntryMoved!(
+            dragState.originalEntry,
+            dragState.targetStart,
+            dragState.targetGroupId,
+            dragState.targetLane,
+          );
+        }
+        scope.interaction.endDrag();
+    }
+
+    _mode = null;
+  }
+
+  void _onPanCancel() {
+    final scope = ZTimelineScope.of(context);
+
+    switch (_mode) {
+      case _InteractionMode.resizeStart:
+      case _InteractionMode.resizeEnd:
+        scope.interaction.cancelResize();
+      case _InteractionMode.drag:
+        scope.interaction.cancelDrag();
+      case null:
+        break;
+    }
+
+    _mode = null;
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    final entry = widget.entry;
+    final isPoint = !entry.hasEnd;
+    final color = widget.colorBuilder(entry);
+    final label = widget.labelBuilder(entry);
+    final isSelected = entry.id == widget.selectedEntryId;
+
+    final top = LayoutCoordinateService.laneToY(
+      lane: entry.lane,
+      laneHeight: widget.laneHeight,
+    );
+
+    if (isPoint) {
+      return _buildPointEntry(entry, color, label, isSelected, top);
+    }
+
+    return _buildRangeEntry(entry, color, label, isSelected, top);
+  }
+
+  /// Range event: EventPill goes in the AnimatedBuilder child: slot
+  /// and is NOT rebuilt during pan — only the Positioned wrapper updates.
+  Widget _buildRangeEntry(
+    TimelineEntry entry,
+    Color color,
+    String label,
+    bool isSelected,
+    double top,
+  ) {
+    final pill = EventPill(color: color, label: label, isSelected: isSelected);
+    final hasResizeHandles =
+        entry.hasEnd && widget.onEntryResized != null;
+
+    Widget content;
+    if (!widget.enableDrag) {
+      content = pill;
+    } else {
+      final scope = ZTimelineScope.of(context);
+      content = ListenableBuilder(
+        listenable: scope.interaction,
+        builder: (context, child) {
+          final entryId = entry.id;
+          final isDragging =
+              scope.interaction.isDraggingEntry &&
+              scope.interaction.dragState?.entryId == entryId;
+          final isResizing =
+              scope.interaction.isResizingEntry &&
+              scope.interaction.resizeState?.entryId == entryId;
+
+          return Opacity(
+            opacity: isDragging || isResizing ? 0.3 : 1.0,
+            child: child,
+          );
+        },
+        child: _buildInteractivePill(pill, hasResizeHandles),
+      );
+    }
+
+    return AnimatedBuilder(
+      animation: widget.viewport,
+      builder: (context, child) {
+        final startX = TimeScaleService.mapTimeToPosition(
+          entry.start,
+          widget.viewport.start,
+          widget.viewport.end,
+        );
+        final left = LayoutCoordinateService.normalizedToWidgetX(
+          normalizedX: startX,
+          contentWidth: widget.contentWidth,
+        );
+        final width = _pillWidthFromEntry(entry);
+
+        return Positioned(
+          top: top,
+          left: left,
+          width: width,
+          height: widget.laneHeight,
+          child: child!,
+        );
+      },
+      child: content,
+    );
+  }
+
+  /// Point event: maxTextWidth depends on viewport, so EventPoint is
+  /// built inside the AnimatedBuilder. Point events are typically few,
+  /// so this has negligible cost.
+  Widget _buildPointEntry(
+    TimelineEntry entry,
+    Color color,
+    String label,
+    bool isSelected,
+    double top,
+  ) {
+    // For point events we need to rebuild EventPoint in the builder because
+    // maxTextWidth depends on the viewport position of the next entry.
+    //
+    // Hoist scope lookup before AnimatedBuilder to avoid re-looking it up on
+    // every animation frame (InheritedWidget lookup is cheap but unnecessary).
+    final scope = widget.enableDrag ? ZTimelineScope.of(context) : null;
+
+    return AnimatedBuilder(
+      animation: widget.viewport,
+      builder: (context, _) {
+        final startX = TimeScaleService.mapTimeToPosition(
+          entry.start,
+          widget.viewport.start,
+          widget.viewport.end,
+        );
+        double? nextStartX;
+        if (widget.nextEntryInLane != null) {
+          nextStartX = TimeScaleService.mapTimeToPosition(
+            widget.nextEntryInLane!.start,
+            widget.viewport.start,
+            widget.viewport.end,
+          );
+        }
+
+        final left = LayoutCoordinateService.normalizedToWidgetX(
+          normalizedX: startX,
+          contentWidth: widget.contentWidth,
+        );
+
+        final availableWidth = nextStartX != null
+            ? (nextStartX - startX) * widget.contentWidth
+            : (1.0 - startX) * widget.contentWidth;
+
+        final maxTextWidth = availableWidth -
+            ZTimelineConstants.pointEventCircleDiameter -
+            ZTimelineConstants.pointEventCircleTextGap -
+            ZTimelineConstants.pointEventTextGap;
+
+        final pointWidget = EventPoint(
+          color: color,
+          label: label,
+          maxTextWidth: maxTextWidth > 0 ? maxTextWidth : 0,
+          isSelected: isSelected,
+        );
+
+        if (!widget.enableDrag) {
+          return Positioned(
+            top: top,
+            left: left,
+            width: availableWidth.clamp(
+              ZTimelineConstants.pointEventCircleDiameter,
+              double.infinity,
+            ),
+            height: widget.laneHeight,
+            child: Align(
+              alignment: Alignment.centerLeft,
+              child: pointWidget,
+            ),
+          );
+        }
+
+        return Positioned(
+          top: top,
+          left: left,
+          width: availableWidth.clamp(
+            ZTimelineConstants.pointEventCircleDiameter,
+            double.infinity,
+          ),
+          height: widget.laneHeight,
+          child: ListenableBuilder(
+            listenable: scope!.interaction,
+            builder: (context, child) {
+              final entryId = entry.id;
+              final isDragging = scope!.interaction.isDraggingEntry &&
+                  scope!.interaction.dragState?.entryId == entryId;
+
+              return Opacity(
+                opacity: isDragging ? 0.3 : 1.0,
+                child: child,
+              );
+            },
+            child: _buildInteractivePoint(pointWidget),
+          ),
+        );
+      },
+    );
+  }
+
+  void _onHoverEnter() {
+    final box = context.findRenderObject() as RenderBox?;
+    if (box == null || !box.attached) return;
+    final topLeft = box.localToGlobal(Offset.zero);
+    final rect = topLeft & box.size;
+    final scope = ZTimelineScope.of(context);
+    scope.interaction.setHoveredEntry(widget.entry.id, rect);
+  }
+
+  void _onHoverExit() {
+    final scope = ZTimelineScope.of(context);
+    scope.interaction.clearHoveredEntry();
+  }
+
+  void _onPointHoverEnter() {
+    final box =
+        _pointInteractionKey.currentContext?.findRenderObject() as RenderBox?;
+    if (box == null || !box.attached) return;
+    final topLeft = box.localToGlobal(Offset.zero);
+    final rect = topLeft & box.size;
+    final scope = ZTimelineScope.of(context);
+    scope.interaction.setHoveredEntry(widget.entry.id, rect);
+  }
+
+  Widget _buildInteractivePoint(Widget pointWidget) {
+    return Align(
+      alignment: Alignment.centerLeft,
+      child: MouseRegion(
+        key: _pointInteractionKey,
+        cursor: SystemMouseCursors.click,
+        opaque: false,
+        hitTestBehavior: HitTestBehavior.deferToChild,
+        onEnter: (_) => _onPointHoverEnter(),
+        onExit: (_) => _onHoverExit(),
+        child: GestureDetector(
+          behavior: HitTestBehavior.opaque,
+          onTap: () => widget.onEntrySelected?.call(widget.entry),
+          onPanDown: _onPanDown,
+          onPanStart: _onPanStart,
+          onPanUpdate: _onPanUpdate,
+          onPanEnd: _onPanEnd,
+          onPanCancel: _onPanCancel,
+          child: pointWidget,
+        ),
+      ),
+    );
+  }
+
+  Widget _buildInteractivePill(Widget pill, bool hasResizeHandles) {
+    return MouseRegion(
+      opaque: false,
+      hitTestBehavior: HitTestBehavior.deferToChild,
+      onEnter: (_) => _onHoverEnter(),
+      onExit: (_) => _onHoverExit(),
+      child: GestureDetector(
+        behavior: HitTestBehavior.opaque,
+        onTap: () => widget.onEntrySelected?.call(widget.entry),
+        onPanDown: _onPanDown,
+        onPanStart: _onPanStart,
+        onPanUpdate: _onPanUpdate,
+        onPanEnd: _onPanEnd,
+        onPanCancel: _onPanCancel,
+        child: Stack(
+          children: [
+            pill,
+            // Left resize cursor zone
+            if (hasResizeHandles)
+              Positioned(
+                left: 0,
+                top: 0,
+                bottom: 0,
+                width: ZTimelineConstants.resizeHandleWidth,
+                child: const MouseRegion(
+                  cursor: SystemMouseCursors.resizeColumn,
+                  opaque: false,
+                ),
+              ),
+            // Right resize cursor zone
+            if (hasResizeHandles)
+              Positioned(
+                right: 0,
+                top: 0,
+                bottom: 0,
+                width: ZTimelineConstants.resizeHandleWidth,
+                child: const MouseRegion(
+                  cursor: SystemMouseCursors.resizeColumn,
+                  opaque: false,
+                ),
+              ),
+            // Center click cursor zone (between handles)
+            if (hasResizeHandles)
+              Positioned(
+                left: ZTimelineConstants.resizeHandleWidth,
+                right: ZTimelineConstants.resizeHandleWidth,
+                top: 0,
+                bottom: 0,
+                child: const MouseRegion(
+                  cursor: SystemMouseCursors.click,
+                  opaque: false,
+                ),
+              )
+            else
+              Positioned.fill(
+                child: const MouseRegion(
+                  cursor: SystemMouseCursors.click,
+                  opaque: false,
+                ),
+              ),
+          ],
+        ),
+      ),
+    );
+  }
+}

packages/z-flutter/packages/z_timeline/lib/src/widgets/timeline_breadcrumb.dart

@@ -98,10 +98,7 @@ class ZTimelineBreadcrumb extends StatelessWidget {
 }
 
 class _BreadcrumbSegmentRow extends StatelessWidget {
-  const _BreadcrumbSegmentRow({
-    required this.segments,
-    required this.viewport,
-  });
+  const _BreadcrumbSegmentRow({required this.segments, required this.viewport});
 
   final List<BreadcrumbSegment> segments;
   final TimelineViewportNotifier viewport;
@@ -173,9 +170,9 @@ class _ZoomLevelIndicator extends StatelessWidget {
       ),
       child: Text(
         level.label,
-        style: Theme.of(context).textTheme.labelSmall?.copyWith(
-          color: colorScheme.onSurfaceVariant,
-        ),
+        style: Theme.of(
+          context,
+        ).textTheme.labelSmall?.copyWith(color: colorScheme.onSurfaceVariant),
       ),
     );
   }

packages/z-flutter/packages/z_timeline/lib/src/widgets/timeline_interactor.dart

@@ -27,6 +27,7 @@ class ZTimelineInteractor extends StatefulWidget {
   const ZTimelineInteractor({
     required this.child,
     this.autofocus = true,
+    this.onBackgroundTap,
     super.key,
   });
 
@@ -36,6 +37,9 @@ class ZTimelineInteractor extends StatefulWidget {
   /// Whether to automatically focus this widget for keyboard input.
   final bool autofocus;
 
+  /// Called when the user taps empty space (not on a pill/entry).
+  final VoidCallback? onBackgroundTap;
+
   @override
   State<ZTimelineInteractor> createState() => _ZTimelineInteractorState();
 }
@@ -88,7 +92,7 @@ class _ZTimelineInteractorState extends State<ZTimelineInteractor> {
     // Single-finger pan
     else if (details.pointerCount == 1 &&
         config.enablePan &&
-        !scope.interaction.isDraggingEntry) {
+        !scope.interaction.isInteracting) {
       if (_lastFocalPoint != null) {
         final diff = details.focalPoint - _lastFocalPoint!;
         final ratio = -diff.dx / width;
@@ -221,8 +225,9 @@ class _ZTimelineInteractorState extends State<ZTimelineInteractor> {
             listenable: scope.interaction,
             builder: (context, child) {
               return MouseRegion(
-                cursor:
-                    scope.interaction.isGrabbing ||
+                cursor: scope.interaction.isResizingEntry
+                    ? SystemMouseCursors.resizeColumn
+                    : scope.interaction.isGrabbing ||
                           scope.interaction.isDraggingEntry
                     ? SystemMouseCursors.grabbing
                     : SystemMouseCursors.basic,
@@ -230,6 +235,7 @@ class _ZTimelineInteractorState extends State<ZTimelineInteractor> {
               );
             },
             child: GestureDetector(
+              onTap: widget.onBackgroundTap,
               onScaleStart: _handleScaleStart,
               onScaleUpdate: _handleScaleUpdate,
               onScaleEnd: _handleScaleEnd,

packages/z-flutter/packages/z_timeline/lib/src/widgets/timeline_scope.dart

@@ -1,6 +1,7 @@
 import 'package:flutter/material.dart';
 
 import '../models/interaction_config.dart';
+import '../services/timeline_group_registry.dart';
 import '../state/timeline_interaction_notifier.dart';
 import '../state/timeline_viewport_notifier.dart';
 
@@ -61,11 +62,13 @@ class ZTimelineScope extends StatefulWidget {
 
 class _ZTimelineScopeState extends State<ZTimelineScope> {
   late final ZTimelineInteractionNotifier _interactionNotifier;
+  late final TimelineGroupRegistry _groupRegistry;
 
   @override
   void initState() {
     super.initState();
     _interactionNotifier = ZTimelineInteractionNotifier();
+    _groupRegistry = TimelineGroupRegistry();
   }
 
   @override
@@ -81,6 +84,7 @@ class _ZTimelineScopeState extends State<ZTimelineScope> {
         viewport: widget.viewport,
         interaction: _interactionNotifier,
         config: widget.config,
+        groupRegistry: _groupRegistry,
       ),
       child: widget.child,
     );
@@ -105,6 +109,7 @@ class ZTimelineScopeData {
     required this.viewport,
     required this.interaction,
     required this.config,
+    required this.groupRegistry,
   });
 
   /// The viewport notifier for domain state (start/end times).
@@ -116,15 +121,19 @@ class ZTimelineScopeData {
   /// Configuration for interaction behavior.
   final ZTimelineInteractionConfig config;
 
+  /// Registry for group lane areas, used for cross-group hit detection.
+  final TimelineGroupRegistry groupRegistry;
+
   @override
   bool operator ==(Object other) {
     if (identical(this, other)) return true;
     return other is ZTimelineScopeData &&
         other.viewport == viewport &&
         other.interaction == interaction &&
-        other.config == config;
+        other.config == config &&
+        other.groupRegistry == groupRegistry;
   }
 
   @override
-  int get hashCode => Object.hash(viewport, interaction, config);
+  int get hashCode => Object.hash(viewport, interaction, config, groupRegistry);
 }

packages/z-flutter/packages/z_timeline/lib/src/widgets/timeline_tiered_header.dart

@@ -97,8 +97,9 @@ class ZTimelineTieredHeader extends StatelessWidget {
                       domainEnd: effectiveViewport.end,
                       borderColor: Theme.of(context).colorScheme.outlineVariant,
                       labelColor: Theme.of(context).colorScheme.onSurface,
-                      secondaryLabelColor:
-                          Theme.of(context).colorScheme.onSurfaceVariant,
+                      secondaryLabelColor: Theme.of(
+                        context,
+                      ).colorScheme.onSurfaceVariant,
                     ),
                   ),
                 ),
@@ -126,9 +127,9 @@ class _ConfigIndicator extends StatelessWidget {
       color: colorScheme.surfaceContainerHighest,
       child: Text(
         'Zoom: $configName',
-        style: Theme.of(context).textTheme.labelSmall?.copyWith(
-          color: colorScheme.onSurfaceVariant,
-        ),
+        style: Theme.of(
+          context,
+        ).textTheme.labelSmall?.copyWith(color: colorScheme.onSurfaceVariant),
       ),
     );
   }
@@ -155,8 +156,7 @@ class _TieredHeaderPainter extends CustomPainter {
 
   @override
   void paint(Canvas canvas, Size size) {
-    final borderPaint =
-        Paint()
+    final borderPaint = Paint()
       ..color = borderColor
       ..strokeWidth = 1.0;
 

packages/z-flutter/packages/z_timeline/lib/src/widgets/timeline_view.dart

@@ -2,14 +2,12 @@ import 'package:flutter/material.dart';
 
 import '../constants.dart';
 import '../models/entry_drag_state.dart';
-import '../models/projected_entry.dart';
+import '../models/entry_resize_state.dart';
 import '../models/timeline_entry.dart';
 import '../models/timeline_group.dart';
-import '../services/timeline_projection_service.dart';
 import '../state/timeline_viewport_notifier.dart';
-import 'draggable_event_pill.dart';
-import 'ghost_overlay.dart';
-import 'group_drop_target.dart';
+import 'drag_preview.dart';
+import 'interactive_event_pill.dart';
 import 'timeline_scope.dart';
 
 typedef EntryLabelBuilder = String Function(TimelineEntry entry);
@@ -24,8 +22,24 @@ typedef OnEntryMoved =
       int newLane,
     );
 
+/// Callback signature for when an entry is resized via edge drag.
+typedef OnEntryResized =
+    void Function(
+      TimelineEntry entry,
+      DateTime newStart,
+      DateTime newEnd,
+      int newLane,
+    );
+
+/// Callback signature for when an entry is tapped / selected.
+typedef OnEntrySelected = void Function(TimelineEntry entry);
+
 /// Base timeline view: renders groups with between-group headers and
 /// lane rows containing event pills.
+///
+/// Viewport changes (pan/zoom) are handled by each pill's internal
+/// [AnimatedBuilder] — the parent tree only rebuilds when [entries]
+/// or [groups] change.
 class ZTimelineView extends StatelessWidget {
   const ZTimelineView({
     super.key,
@@ -37,7 +51,10 @@ class ZTimelineView extends StatelessWidget {
     this.laneHeight = ZTimelineConstants.laneHeight,
     this.groupHeaderHeight = ZTimelineConstants.groupHeaderHeight,
     this.onEntryMoved,
+    this.onEntryResized,
+    this.onEntrySelected,
     this.enableDrag = true,
+    this.selectedEntryId,
   });
 
   final List<TimelineGroup> groups;
@@ -54,19 +71,45 @@ class ZTimelineView extends StatelessWidget {
   /// position. The [newLane] is calculated to avoid collisions.
   final OnEntryMoved? onEntryMoved;
 
+  /// Callback invoked when an entry is resized via edge drag.
+  final OnEntryResized? onEntryResized;
+
+  /// Callback invoked when an entry is tapped / selected.
+  final OnEntrySelected? onEntrySelected;
+
   /// Whether drag-and-drop is enabled.
   final bool enableDrag;
 
+  /// ID of the currently selected entry, if any.
+  final String? selectedEntryId;
+
   @override
   Widget build(BuildContext context) {
-    return AnimatedBuilder(
-      animation: viewport,
-      builder: (context, _) {
-        final projected = const TimelineProjectionService().project(
-          entries: entries,
-          domainStart: viewport.start,
-          domainEnd: viewport.end,
-        );
+    // Group entries by groupId and sort by lane+start.
+    // Runs once per entries/groups change, NOT on every pan frame.
+    final grouped = <String, List<TimelineEntry>>{};
+    for (final e in entries) {
+      (grouped[e.groupId] ??= []).add(e);
+    }
+    for (final list in grouped.values) {
+      list.sort((a, b) {
+        final cmp = a.lane.compareTo(b.lane);
+        return cmp != 0 ? cmp : a.start.compareTo(b.start);
+      });
+    }
+
+    // Pre-compute next-entry-in-lane lookup in O(n).
+    final nextEntryInLane = <String, TimelineEntry>{};
+    for (final list in grouped.values) {
+      final lastInLane = <int, TimelineEntry>{};
+      for (final entry in list) {
+        final prev = lastInLane[entry.lane];
+        if (prev != null) {
+          nextEntryInLane[prev.id] = entry;
+        }
+        lastInLane[entry.lane] = entry;
+      }
+    }
 
     return LayoutBuilder(
       builder: (context, constraints) {
@@ -79,16 +122,18 @@ class ZTimelineView extends StatelessWidget {
           itemBuilder: (context, index) {
             final group = groups[index];
             final groupEntries =
-                    projected[group.id] ?? const <ProjectedEntry>[];
+                grouped[group.id] ?? const <TimelineEntry>[];
             final lanesCount = _countLanes(groupEntries);
 
-                Widget groupColumn = Column(
+            return Column(
               crossAxisAlignment: CrossAxisAlignment.start,
               children: [
                 _GroupHeader(title: group.title, height: groupHeaderHeight),
-                    _GroupLanes(
+                RepaintBoundary(
+                  child: _GroupLanes(
                     group: group,
                     entries: groupEntries,
+                    allEntries: entries,
                     viewport: viewport,
                     lanesCount: lanesCount,
                     laneHeight: laneHeight,
@@ -96,42 +141,26 @@ class ZTimelineView extends StatelessWidget {
                     labelBuilder: labelBuilder,
                     contentWidth: contentWidth,
                     enableDrag: enableDrag,
+                    onEntryResized: onEntryResized,
+                    onEntryMoved: onEntryMoved,
+                    onEntrySelected: onEntrySelected,
+                    selectedEntryId: selectedEntryId,
+                    nextEntryInLane: nextEntryInLane,
+                    groupHeaderHeight: groupHeaderHeight,
+                  ),
                 ),
               ],
             );
-
-                // Wrap the entire group (header + lanes) in a DragTarget
-                // so dragging over headers doesn't create a dead zone.
-                if (enableDrag && onEntryMoved != null) {
-                  groupColumn = GroupDropTarget(
-                    group: group,
-                    entries: groupEntries,
-                    allEntries: entries,
-                    viewport: viewport,
-                    contentWidth: contentWidth,
-                    laneHeight: laneHeight,
-                    lanesCount: lanesCount,
-                    onEntryMoved: onEntryMoved,
-                    verticalOffset:
-                        groupHeaderHeight +
-                        ZTimelineConstants.verticalOuterPadding,
-                    child: groupColumn,
-                  );
-                }
-
-                return groupColumn;
-              },
-            );
           },
         );
       },
     );
   }
 
-  int _countLanes(List<ProjectedEntry> entries) {
+  int _countLanes(List<TimelineEntry> entries) {
     var maxLane = 0;
     for (final e in entries) {
-      if (e.entry.lane > maxLane) maxLane = e.entry.lane;
+      if (e.lane > maxLane) maxLane = e.lane;
     }
     return maxLane.clamp(0, 1000); // basic guard
   }
@@ -162,10 +191,11 @@ class _GroupHeader extends StatelessWidget {
   }
 }
 
-class _GroupLanes extends StatelessWidget {
+class _GroupLanes extends StatefulWidget {
   const _GroupLanes({
     required this.group,
     required this.entries,
+    required this.allEntries,
     required this.viewport,
     required this.lanesCount,
     required this.laneHeight,
@@ -173,10 +203,17 @@ class _GroupLanes extends StatelessWidget {
     required this.colorBuilder,
     required this.contentWidth,
     required this.enableDrag,
+    required this.nextEntryInLane,
+    required this.groupHeaderHeight,
+    this.onEntryResized,
+    this.onEntryMoved,
+    this.onEntrySelected,
+    this.selectedEntryId,
   });
 
   final TimelineGroup group;
-  final List<ProjectedEntry> entries;
+  final List<TimelineEntry> entries;
+  final List<TimelineEntry> allEntries;
   final TimelineViewportNotifier viewport;
   final int lanesCount;
   final double laneHeight;
@@ -184,27 +221,108 @@ class _GroupLanes extends StatelessWidget {
   final EntryColorBuilder colorBuilder;
   final double contentWidth;
   final bool enableDrag;
+  final OnEntryResized? onEntryResized;
+  final OnEntryMoved? onEntryMoved;
+  final OnEntrySelected? onEntrySelected;
+  final String? selectedEntryId;
+  final Map<String, TimelineEntry> nextEntryInLane;
+  final double groupHeaderHeight;
+
+  @override
+  State<_GroupLanes> createState() => _GroupLanesState();
+}
+
+class _GroupLanesState extends State<_GroupLanes> {
+  final GlobalKey _lanesKey = GlobalKey();
+
+  @override
+  void didChangeDependencies() {
+    super.didChangeDependencies();
+    _registerGroup();
+  }
+
+  @override
+  void didUpdateWidget(_GroupLanes oldWidget) {
+    super.didUpdateWidget(oldWidget);
+    if (oldWidget.group.id != widget.group.id) {
+      final scope = ZTimelineScope.maybeOf(context);
+      scope?.groupRegistry.unregister(oldWidget.group.id);
+    }
+    if (oldWidget.lanesCount != widget.lanesCount ||
+        oldWidget.laneHeight != widget.laneHeight ||
+        oldWidget.contentWidth != widget.contentWidth ||
+        oldWidget.group.id != widget.group.id) {
+      _registerGroup();
+    }
+  }
+
+  @override
+  void dispose() {
+    final scope = ZTimelineScope.maybeOf(context);
+    scope?.groupRegistry.unregister(widget.group.id);
+    super.dispose();
+  }
+
+  void _registerGroup() {
+    final scope = ZTimelineScope.maybeOf(context);
+    if (scope == null || !widget.enableDrag) return;
+
+    scope.groupRegistry.register(
+      widget.group.id,
+      _lanesKey,
+      verticalOffset: ZTimelineConstants.verticalOuterPadding,
+      lanesCount: widget.lanesCount,
+      laneHeight: widget.laneHeight,
+      contentWidth: widget.contentWidth,
+      headerHeight: widget.groupHeaderHeight,
+    );
+  }
 
   @override
   Widget build(BuildContext context) {
     final scope = ZTimelineScope.maybeOf(context);
 
+    // Build pill widgets once per build() call (stable between interaction
+    // changes). When the ListenableBuilder fires, the same widget objects
+    // are reused — Flutter matches by identity and skips rebuilding.
+    final pillWidgets = <Widget>[
+      for (final entry in widget.entries)
+        InteractiveEventPill(
+          key: ValueKey(entry.id),
+          entry: entry,
+          laneHeight: widget.laneHeight,
+          labelBuilder: widget.labelBuilder,
+          colorBuilder: widget.colorBuilder,
+          contentWidth: widget.contentWidth,
+          enableDrag: widget.enableDrag,
+          viewport: widget.viewport,
+          allEntries: widget.allEntries,
+          onEntryResized: widget.onEntryResized,
+          onEntryMoved: widget.onEntryMoved,
+          onEntrySelected: widget.onEntrySelected,
+          selectedEntryId: widget.selectedEntryId,
+          groupRegistry: scope?.groupRegistry,
+          nextEntryInLane: widget.nextEntryInLane[entry.id],
+        ),
+    ];
+
     // If no scope (drag not enabled), use static height
-    if (scope == null || !enableDrag) {
-      return _buildContent(context, lanesCount);
+    if (scope == null || !widget.enableDrag) {
+      return _wrapContent(pillWidgets, widget.lanesCount, null);
     }
 
-    // Listen to interaction notifier for drag state changes
+    // Listen to interaction only for height changes + drag preview.
     return ListenableBuilder(
       listenable: scope.interaction,
       builder: (context, _) {
         final effectiveLanesCount = _calculateEffectiveLanesCount(
-          actualLanesCount: lanesCount,
+          actualLanesCount: widget.lanesCount,
           dragState: scope.interaction.dragState,
-          groupId: group.id,
+          resizeState: scope.interaction.resizeState,
+          groupId: widget.group.id,
         );
 
-        return _buildContent(context, effectiveLanesCount);
+        return _wrapContent(pillWidgets, effectiveLanesCount, scope);
       },
     );
   }
@@ -212,66 +330,47 @@ class _GroupLanes extends StatelessWidget {
   int _calculateEffectiveLanesCount({
     required int actualLanesCount,
     required EntryDragState? dragState,
+    required EntryResizeState? resizeState,
     required String groupId,
   }) {
-    // No drag active - use actual lane count
-    if (dragState == null) {
-      return actualLanesCount;
+    var effective = actualLanesCount;
+
+    // Expand for drag target lane
+    if (dragState != null && dragState.targetGroupId == groupId) {
+      if (dragState.targetLane > effective) {
+        effective = dragState.targetLane;
+      }
     }
 
-    // Drag active but over different group - use actual lane count
-    if (dragState.targetGroupId != groupId) {
-      return actualLanesCount;
+    // Expand for resize target lane
+    if (resizeState != null && resizeState.originalEntry.groupId == groupId) {
+      if (resizeState.targetLane > effective) {
+        effective = resizeState.targetLane;
+      }
     }
 
-    // Drag active over this group - expand to accommodate target lane
-    return actualLanesCount > dragState.targetLane
-        ? actualLanesCount
-        : dragState.targetLane;
+    return effective;
   }
 
-  Widget _buildContent(BuildContext context, int effectiveLanesCount) {
+  Widget _wrapContent(
+    List<Widget> pillWidgets,
+    int effectiveLanesCount,
+    ZTimelineScopeData? scope,
+  ) {
     final totalHeight =
-        effectiveLanesCount * laneHeight +
+        effectiveLanesCount * widget.laneHeight +
         (effectiveLanesCount > 0
             ? (effectiveLanesCount - 1) * ZTimelineConstants.laneVerticalSpacing
             : 0);
-    final scope = ZTimelineScope.maybeOf(context);
 
-    // The inner Stack with pills and ghost overlay
-    Widget innerStack = SizedBox(
+    final innerStack = SizedBox(
       height: totalHeight,
       width: double.infinity,
       child: Stack(
         children: [
-          // Event pills
-          for (final e in entries)
-            DraggableEventPill(
-              entry: e,
-              laneHeight: laneHeight,
-              labelBuilder: labelBuilder,
-              colorBuilder: colorBuilder,
-              contentWidth: contentWidth,
-              enableDrag: enableDrag,
-            ),
-
-          // Ghost overlay (rendered in same coordinate space as pills)
-          if (enableDrag && scope != null)
-            ListenableBuilder(
-              listenable: scope.interaction,
-              builder: (context, _) {
-                final dragState = scope.interaction.dragState;
-                if (dragState == null || dragState.targetGroupId != group.id) {
-                  return const SizedBox.shrink();
-                }
-                return GhostOverlay(
-                  dragState: dragState,
-                  viewport: viewport,
-                  contentWidth: contentWidth,
-                  laneHeight: laneHeight,
-                );
-              },
-            ),
+          ...pillWidgets,
+          // Ghost overlay for drag operations
+          if (widget.enableDrag && scope != null) _buildDragPreview(scope),
         ],
       ),
     );
@@ -281,6 +380,7 @@ class _GroupLanes extends StatelessWidget {
       curve: Curves.easeInOut,
       alignment: Alignment.topCenter,
       child: Padding(
+        key: _lanesKey,
         padding: EdgeInsets.symmetric(
           vertical: ZTimelineConstants.verticalOuterPadding,
         ),
@@ -288,4 +388,42 @@ class _GroupLanes extends StatelessWidget {
       ),
     );
   }
+
+  Widget _buildDragPreview(ZTimelineScopeData scope) {
+    final dragState = scope.interaction.dragState;
+    final resizeState = scope.interaction.resizeState;
+
+    // Show ghost for resize (entry stays in its own group)
+    if (resizeState != null &&
+        resizeState.originalEntry.groupId == widget.group.id) {
+      return DragPreview(
+        targetStart: resizeState.targetStart,
+        targetEnd: resizeState.targetEnd,
+        targetLane: resizeState.targetLane,
+        viewport: widget.viewport,
+        contentWidth: widget.contentWidth,
+        laneHeight: widget.laneHeight,
+        color: widget.colorBuilder(resizeState.originalEntry),
+        label: widget.labelBuilder(resizeState.originalEntry),
+        hasEnd: resizeState.originalEntry.hasEnd,
+      );
+    }
+
+    // Show ghost for drag-move
+    if (dragState != null && dragState.targetGroupId == widget.group.id) {
+      return DragPreview(
+        targetStart: dragState.targetStart,
+        targetEnd: dragState.targetEnd,
+        targetLane: dragState.targetLane,
+        viewport: widget.viewport,
+        contentWidth: widget.contentWidth,
+        laneHeight: widget.laneHeight,
+        color: widget.colorBuilder(dragState.originalEntry),
+        label: widget.labelBuilder(dragState.originalEntry),
+        hasEnd: dragState.originalEntry.hasEnd,
+      );
+    }
+
+    return const SizedBox.shrink();
+  }
 }

packages/z-flutter/packages/z_timeline/lib/z_timeline.dart

@@ -7,9 +7,9 @@ export 'src/constants.dart';
 // Models
 export 'src/models/breadcrumb_segment.dart';
 export 'src/models/entry_drag_state.dart';
+export 'src/models/entry_resize_state.dart';
 export 'src/models/interaction_config.dart';
 export 'src/models/interaction_state.dart';
-export 'src/models/projected_entry.dart';
 export 'src/models/tier_config.dart';
 export 'src/models/tier_section.dart';
 export 'src/models/tiered_tick_data.dart';
@@ -23,17 +23,18 @@ export 'src/services/entry_placement_service.dart';
 export 'src/services/layout_coordinate_service.dart';
 export 'src/services/tiered_tick_service.dart';
 export 'src/services/time_scale_service.dart';
-export 'src/services/timeline_projection_service.dart';
-
+export 'src/services/timeline_group_registry.dart';
 // State
 export 'src/state/timeline_interaction_notifier.dart';
 export 'src/state/timeline_viewport_notifier.dart';
 
 // Widgets
 export 'src/widgets/breadcrumb_segment_chip.dart';
-export 'src/widgets/draggable_event_pill.dart';
-export 'src/widgets/ghost_overlay.dart';
-export 'src/widgets/group_drop_target.dart';
+export 'src/widgets/entry_popover_overlay.dart';
+export 'src/widgets/event_pill.dart';
+export 'src/widgets/event_point.dart';
+export 'src/widgets/drag_preview.dart';
+export 'src/widgets/interactive_event_pill.dart';
 export 'src/widgets/timeline_breadcrumb.dart';
 export 'src/widgets/timeline_interactor.dart';
 export 'src/widgets/timeline_scope.dart';

packages/z-flutter/packages/z_timeline/pubspec.lock

@@ -0,0 +1,205 @@
+# Generated by pub
+# See https://dart.dev/tools/pub/glossary#lockfile
+packages:
+  async:
+    dependency: transitive
+    description:
+      name: async
+      sha256: "758e6d74e971c3e5aceb4110bfd6698efc7f501675bcfe0c775459a8140750eb"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.13.0"
+  boolean_selector:
+    dependency: transitive
+    description:
+      name: boolean_selector
+      sha256: "8aab1771e1243a5063b8b0ff68042d67334e3feab9e95b9490f9a6ebf73b42ea"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.1.2"
+  characters:
+    dependency: transitive
+    description:
+      name: characters
+      sha256: faf38497bda5ead2a8c7615f4f7939df04333478bf32e4173fcb06d428b5716b
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.4.1"
+  clock:
+    dependency: transitive
+    description:
+      name: clock
+      sha256: fddb70d9b5277016c77a80201021d40a2247104d9f4aa7bab7157b7e3f05b84b
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.1.2"
+  collection:
+    dependency: transitive
+    description:
+      name: collection
+      sha256: "2f5709ae4d3d59dd8f7cd309b4e023046b57d8a6c82130785d2b0e5868084e76"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.19.1"
+  fake_async:
+    dependency: transitive
+    description:
+      name: fake_async
+      sha256: "5368f224a74523e8d2e7399ea1638b37aecfca824a3cc4dfdf77bf1fa905ac44"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.3.3"
+  flutter:
+    dependency: "direct main"
+    description: flutter
+    source: sdk
+    version: "0.0.0"
+  flutter_lints:
+    dependency: "direct dev"
+    description:
+      name: flutter_lints
+      sha256: "3105dc8492f6183fb076ccf1f351ac3d60564bff92e20bfc4af9cc1651f4e7e1"
+      url: "https://pub.dev"
+    source: hosted
+    version: "6.0.0"
+  flutter_test:
+    dependency: "direct dev"
+    description: flutter
+    source: sdk
+    version: "0.0.0"
+  leak_tracker:
+    dependency: transitive
+    description:
+      name: leak_tracker
+      sha256: "33e2e26bdd85a0112ec15400c8cbffea70d0f9c3407491f672a2fad47915e2de"
+      url: "https://pub.dev"
+    source: hosted
+    version: "11.0.2"
+  leak_tracker_flutter_testing:
+    dependency: transitive
+    description:
+      name: leak_tracker_flutter_testing
+      sha256: "1dbc140bb5a23c75ea9c4811222756104fbcd1a27173f0c34ca01e16bea473c1"
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.0.10"
+  leak_tracker_testing:
+    dependency: transitive
+    description:
+      name: leak_tracker_testing
+      sha256: "8d5a2d49f4a66b49744b23b018848400d23e54caf9463f4eb20df3eb8acb2eb1"
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.0.2"
+  lints:
+    dependency: transitive
+    description:
+      name: lints
+      sha256: "12f842a479589fea194fe5c5a3095abc7be0c1f2ddfa9a0e76aed1dbd26a87df"
+      url: "https://pub.dev"
+    source: hosted
+    version: "6.1.0"
+  matcher:
+    dependency: transitive
+    description:
+      name: matcher
+      sha256: "12956d0ad8390bbcc63ca2e1469c0619946ccb52809807067a7020d57e647aa6"
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.12.18"
+  material_color_utilities:
+    dependency: transitive
+    description:
+      name: material_color_utilities
+      sha256: "9c337007e82b1889149c82ed242ed1cb24a66044e30979c44912381e9be4c48b"
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.13.0"
+  meta:
+    dependency: transitive
+    description:
+      name: meta
+      sha256: "23f08335362185a5ea2ad3a4e597f1375e78bce8a040df5c600c8d3552ef2394"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.17.0"
+  path:
+    dependency: transitive
+    description:
+      name: path
+      sha256: "75cca69d1490965be98c73ceaea117e8a04dd21217b37b292c9ddbec0d955bc5"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.9.1"
+  sky_engine:
+    dependency: transitive
+    description: flutter
+    source: sdk
+    version: "0.0.0"
+  source_span:
+    dependency: transitive
+    description:
+      name: source_span
+      sha256: "56a02f1f4cd1a2d96303c0144c93bd6d909eea6bee6bf5a0e0b685edbd4c47ab"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.10.2"
+  stack_trace:
+    dependency: transitive
+    description:
+      name: stack_trace
+      sha256: "8b27215b45d22309b5cddda1aa2b19bdfec9df0e765f2de506401c071d38d1b1"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.12.1"
+  stream_channel:
+    dependency: transitive
+    description:
+      name: stream_channel
+      sha256: "969e04c80b8bcdf826f8f16579c7b14d780458bd97f56d107d3950fdbeef059d"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.1.4"
+  string_scanner:
+    dependency: transitive
+    description:
+      name: string_scanner
+      sha256: "921cd31725b72fe181906c6a94d987c78e3b98c2e205b397ea399d4054872b43"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.4.1"
+  term_glyph:
+    dependency: transitive
+    description:
+      name: term_glyph
+      sha256: "7f554798625ea768a7518313e58f83891c7f5024f88e46e7182a4558850a4b8e"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.2.2"
+  test_api:
+    dependency: transitive
+    description:
+      name: test_api
+      sha256: "93167629bfc610f71560ab9312acdda4959de4df6fac7492c89ff0d3886f6636"
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.7.9"
+  vector_math:
+    dependency: transitive
+    description:
+      name: vector_math
+      sha256: d530bd74fea330e6e364cda7a85019c434070188383e1cd8d9777ee586914c5b
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.2.0"
+  vm_service:
+    dependency: transitive
+    description:
+      name: vm_service
+      sha256: "45caa6c5917fa127b5dbcfbd1fa60b14e583afdc08bfc96dda38886ca252eb60"
+      url: "https://pub.dev"
+    source: hosted
+    version: "15.0.2"
+sdks:
+  dart: ">=3.11.0 <4.0.0"
+  flutter: ">=3.18.0-18.0.pre.54"

packages/z-flutter/packages/z_timeline/test/helpers/test_constants.dart

@@ -0,0 +1,12 @@
+/// Reusable UTC date anchors for timeline tests.
+///
+/// All dates are UTC to avoid timezone flakiness.
+
+/// Domain start: June 1, 2025 00:00 UTC.
+final kDomainStart = DateTime.utc(2025, 6, 1);
+
+/// Domain end: July 1, 2025 00:00 UTC (30-day domain).
+final kDomainEnd = DateTime.utc(2025, 7, 1);
+
+/// Midpoint anchor: June 15, 2025 12:00 UTC.
+final kAnchor = DateTime.utc(2025, 6, 15, 12);

packages/z-flutter/packages/z_timeline/test/helpers/test_factories.dart

@@ -0,0 +1,88 @@
+import 'package:z_timeline/src/models/entry_drag_state.dart';
+import 'package:z_timeline/src/models/entry_resize_state.dart';
+import 'package:z_timeline/src/models/timeline_entry.dart';
+import 'package:z_timeline/src/models/timeline_group.dart';
+
+import 'test_constants.dart';
+
+/// Creates a [TimelineEntry] with sensible defaults, all fields overridable.
+TimelineEntry makeEntry({
+  String? id,
+  String? groupId,
+  DateTime? start,
+  DateTime? end,
+  int lane = 1,
+  bool hasEnd = true,
+}) {
+  return TimelineEntry(
+    id: id ?? 'entry-1',
+    groupId: groupId ?? 'group-1',
+    start: start ?? kAnchor,
+    end: end ?? kAnchor.add(const Duration(hours: 2)),
+    lane: lane,
+    hasEnd: hasEnd,
+  );
+}
+
+/// Creates a [TimelineGroup] with sensible defaults.
+TimelineGroup makeGroup({String? id, String? title}) {
+  return TimelineGroup(id: id ?? 'group-1', title: title ?? 'Group 1');
+}
+
+/// Creates an [EntryDragState] with sensible defaults.
+EntryDragState makeDragState({
+  String? entryId,
+  TimelineEntry? originalEntry,
+  String? targetGroupId,
+  int targetLane = 1,
+  DateTime? targetStart,
+}) {
+  final entry = originalEntry ?? makeEntry(id: entryId);
+  return EntryDragState(
+    entryId: entry.id,
+    originalEntry: entry,
+    targetGroupId: targetGroupId ?? entry.groupId,
+    targetLane: targetLane,
+    targetStart: targetStart ?? entry.start,
+  );
+}
+
+/// Creates an [EntryResizeState] with sensible defaults.
+EntryResizeState makeResizeState({
+  String? entryId,
+  TimelineEntry? originalEntry,
+  ResizeEdge edge = ResizeEdge.end,
+  DateTime? targetStart,
+  DateTime? targetEnd,
+  int targetLane = 1,
+}) {
+  final entry = originalEntry ?? makeEntry(id: entryId);
+  return EntryResizeState(
+    entryId: entry.id,
+    originalEntry: entry,
+    edge: edge,
+    targetStart: targetStart ?? entry.start,
+    targetEnd: targetEnd ?? entry.end,
+    targetLane: targetLane,
+  );
+}
+
+/// Creates N non-overlapping entries in the same group/lane for collision tests.
+///
+/// Each entry is 1 hour long, starting 2 hours apart.
+List<TimelineEntry> makeEntrySequence(
+  int count, {
+  String groupId = 'group-1',
+  int lane = 1,
+}) {
+  return List.generate(count, (i) {
+    final start = kAnchor.add(Duration(hours: i * 2));
+    return makeEntry(
+      id: 'seq-$i',
+      groupId: groupId,
+      lane: lane,
+      start: start,
+      end: start.add(const Duration(hours: 1)),
+    );
+  });
+}

packages/z-flutter/packages/z_timeline/test/helpers/timeline_test_harness.dart

@@ -0,0 +1,56 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:z_timeline/src/models/interaction_config.dart';
+import 'package:z_timeline/src/state/timeline_viewport_notifier.dart';
+import 'package:z_timeline/src/widgets/timeline_scope.dart';
+
+import 'test_constants.dart';
+
+/// Test harness wrapping a child in MaterialApp > Scaffold > ZTimelineScope.
+///
+/// Provides controllable [TimelineViewportNotifier] and
+/// [ZTimelineInteractionConfig].
+class TimelineTestHarness extends StatelessWidget {
+  const TimelineTestHarness({
+    required this.viewport,
+    required this.child,
+    this.config = ZTimelineInteractionConfig.defaults,
+    super.key,
+  });
+
+  final TimelineViewportNotifier viewport;
+  final ZTimelineInteractionConfig config;
+  final Widget child;
+
+  @override
+  Widget build(BuildContext context) {
+    return MaterialApp(
+      home: Scaffold(
+        body: ZTimelineScope(
+          viewport: viewport,
+          config: config,
+          child: child,
+        ),
+      ),
+    );
+  }
+}
+
+/// Convenience extension on [WidgetTester] for pumping a timeline test harness.
+extension TimelineTestHarnessExtension on WidgetTester {
+  /// Pumps a [TimelineTestHarness] with the given child and optional config.
+  ///
+  /// Returns the [TimelineViewportNotifier] for controlling the viewport.
+  Future<TimelineViewportNotifier> pumpTimeline(
+    Widget child, {
+    TimelineViewportNotifier? viewport,
+    ZTimelineInteractionConfig config = ZTimelineInteractionConfig.defaults,
+  }) async {
+    final vp = viewport ??
+        TimelineViewportNotifier(start: kDomainStart, end: kDomainEnd);
+    await pumpWidget(
+      TimelineTestHarness(viewport: vp, config: config, child: child),
+    );
+    return vp;
+  }
+}

packages/z-flutter/packages/z_timeline/test/services/entry_placement_service_test.dart

@@ -0,0 +1,256 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:z_timeline/src/services/entry_placement_service.dart';
+
+import '../helpers/test_constants.dart';
+import '../helpers/test_factories.dart';
+
+void main() {
+  group('EntryPlacementService', () {
+    group('isPositionAvailable', () {
+      test('empty list is always available', () {
+        final result = EntryPlacementService.isPositionAvailable(
+          entryId: 'new',
+          targetGroupId: 'group-1',
+          targetLane: 1,
+          targetStart: kAnchor,
+          targetEnd: kAnchor.add(const Duration(hours: 1)),
+          existingEntries: [],
+        );
+        expect(result, isTrue);
+      });
+
+      test('overlap in same lane and group is blocked', () {
+        final existing = makeEntry(
+          id: 'existing',
+          groupId: 'group-1',
+          lane: 1,
+          start: kAnchor,
+          end: kAnchor.add(const Duration(hours: 2)),
+        );
+        final result = EntryPlacementService.isPositionAvailable(
+          entryId: 'new',
+          targetGroupId: 'group-1',
+          targetLane: 1,
+          targetStart: kAnchor.add(const Duration(hours: 1)),
+          targetEnd: kAnchor.add(const Duration(hours: 3)),
+          existingEntries: [existing],
+        );
+        expect(result, isFalse);
+      });
+
+      test('different lane is available', () {
+        final existing = makeEntry(
+          id: 'existing',
+          groupId: 'group-1',
+          lane: 1,
+          start: kAnchor,
+          end: kAnchor.add(const Duration(hours: 2)),
+        );
+        final result = EntryPlacementService.isPositionAvailable(
+          entryId: 'new',
+          targetGroupId: 'group-1',
+          targetLane: 2,
+          targetStart: kAnchor,
+          targetEnd: kAnchor.add(const Duration(hours: 2)),
+          existingEntries: [existing],
+        );
+        expect(result, isTrue);
+      });
+
+      test('different group is available', () {
+        final existing = makeEntry(
+          id: 'existing',
+          groupId: 'group-1',
+          lane: 1,
+          start: kAnchor,
+          end: kAnchor.add(const Duration(hours: 2)),
+        );
+        final result = EntryPlacementService.isPositionAvailable(
+          entryId: 'new',
+          targetGroupId: 'group-2',
+          targetLane: 1,
+          targetStart: kAnchor,
+          targetEnd: kAnchor.add(const Duration(hours: 2)),
+          existingEntries: [existing],
+        );
+        expect(result, isTrue);
+      });
+
+      test('self is excluded from collision', () {
+        final existing = makeEntry(
+          id: 'self',
+          groupId: 'group-1',
+          lane: 1,
+          start: kAnchor,
+          end: kAnchor.add(const Duration(hours: 2)),
+        );
+        final result = EntryPlacementService.isPositionAvailable(
+          entryId: 'self',
+          targetGroupId: 'group-1',
+          targetLane: 1,
+          targetStart: kAnchor,
+          targetEnd: kAnchor.add(const Duration(hours: 2)),
+          existingEntries: [existing],
+        );
+        expect(result, isTrue);
+      });
+
+      test('touching entries (end == start) do not overlap', () {
+        final existing = makeEntry(
+          id: 'existing',
+          groupId: 'group-1',
+          lane: 1,
+          start: kAnchor,
+          end: kAnchor.add(const Duration(hours: 1)),
+        );
+        final result = EntryPlacementService.isPositionAvailable(
+          entryId: 'new',
+          targetGroupId: 'group-1',
+          targetLane: 1,
+          targetStart: kAnchor.add(const Duration(hours: 1)),
+          targetEnd: kAnchor.add(const Duration(hours: 2)),
+          existingEntries: [existing],
+        );
+        // end == start means s1.isBefore(e2) && e1.isAfter(s2) — touching
+        // is NOT overlapping because e1 == s2 means e1.isAfter(s2) is false
+        expect(result, isTrue);
+      });
+    });
+
+    group('findNearestAvailableLane', () {
+      test('target available returns target', () {
+        final result = EntryPlacementService.findNearestAvailableLane(
+          entryId: 'new',
+          targetGroupId: 'group-1',
+          targetLane: 1,
+          targetStart: kAnchor,
+          targetEnd: kAnchor.add(const Duration(hours: 1)),
+          existingEntries: [],
+        );
+        expect(result, 1);
+      });
+
+      test('target blocked finds next available', () {
+        final existing = makeEntry(
+          id: 'blocker',
+          groupId: 'group-1',
+          lane: 1,
+          start: kAnchor,
+          end: kAnchor.add(const Duration(hours: 2)),
+        );
+        final result = EntryPlacementService.findNearestAvailableLane(
+          entryId: 'new',
+          targetGroupId: 'group-1',
+          targetLane: 1,
+          targetStart: kAnchor,
+          targetEnd: kAnchor.add(const Duration(hours: 1)),
+          existingEntries: [existing],
+        );
+        // Lane 1 blocked, tries lane 2 (which is free)
+        expect(result, 2);
+      });
+
+      test('expanding search: +1, -1, +2, etc.', () {
+        // Block lanes 3 and 4, target lane 3. Should find lane 2 (3-1).
+        final entries = [
+          makeEntry(
+            id: 'a',
+            groupId: 'group-1',
+            lane: 3,
+            start: kAnchor,
+            end: kAnchor.add(const Duration(hours: 2)),
+          ),
+          makeEntry(
+            id: 'b',
+            groupId: 'group-1',
+            lane: 4,
+            start: kAnchor,
+            end: kAnchor.add(const Duration(hours: 2)),
+          ),
+        ];
+        final result = EntryPlacementService.findNearestAvailableLane(
+          entryId: 'new',
+          targetGroupId: 'group-1',
+          targetLane: 3,
+          targetStart: kAnchor,
+          targetEnd: kAnchor.add(const Duration(hours: 1)),
+          existingEntries: entries,
+        );
+        // Lane 3 blocked, tries 4 (blocked), then 2 (free)
+        expect(result, 2);
+      });
+
+      test('lane 1 minimum enforced (no lane 0)', () {
+        // Block lanes 1 and 2, target lane 1. Should skip 0 and find lane 3.
+        final entries = [
+          makeEntry(
+            id: 'a',
+            groupId: 'group-1',
+            lane: 1,
+            start: kAnchor,
+            end: kAnchor.add(const Duration(hours: 2)),
+          ),
+          makeEntry(
+            id: 'b',
+            groupId: 'group-1',
+            lane: 2,
+            start: kAnchor,
+            end: kAnchor.add(const Duration(hours: 2)),
+          ),
+        ];
+        final result = EntryPlacementService.findNearestAvailableLane(
+          entryId: 'new',
+          targetGroupId: 'group-1',
+          targetLane: 1,
+          targetStart: kAnchor,
+          targetEnd: kAnchor.add(const Duration(hours: 1)),
+          existingEntries: entries,
+        );
+        // Lane 1 blocked, tries 2 (blocked), then 0 (skipped, <1), then 3
+        expect(result, 3);
+      });
+    });
+
+    group('resolvePlacement', () {
+      test('preserves duration', () {
+        final entry = makeEntry(
+          start: kAnchor,
+          end: kAnchor.add(const Duration(hours: 3)),
+        );
+        final newStart = kAnchor.add(const Duration(hours: 5));
+        final result = EntryPlacementService.resolvePlacement(
+          entry: entry,
+          targetGroupId: 'group-1',
+          targetLane: 1,
+          targetStart: newStart,
+          existingEntries: [],
+        );
+        final expectedEnd = newStart.add(const Duration(hours: 3));
+        expect(result.end, expectedEnd);
+      });
+
+      test('returns collision-free lane', () {
+        final existing = makeEntry(
+          id: 'blocker',
+          groupId: 'group-1',
+          lane: 1,
+          start: kAnchor,
+          end: kAnchor.add(const Duration(hours: 4)),
+        );
+        final entry = makeEntry(
+          id: 'mover',
+          start: kAnchor,
+          end: kAnchor.add(const Duration(hours: 2)),
+        );
+        final result = EntryPlacementService.resolvePlacement(
+          entry: entry,
+          targetGroupId: 'group-1',
+          targetLane: 1,
+          targetStart: kAnchor,
+          existingEntries: [existing],
+        );
+        expect(result.lane, 2);
+      });
+    });
+  });
+}

packages/z-flutter/packages/z_timeline/test/services/layout_coordinate_service_test.dart

@@ -0,0 +1,126 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:z_timeline/src/constants.dart';
+import 'package:z_timeline/src/services/layout_coordinate_service.dart';
+
+void main() {
+  group('LayoutCoordinateService', () {
+    const contentWidth = 1000.0;
+    const laneHeight = ZTimelineConstants.laneHeight;
+
+    group('normalizedToWidgetX / widgetXToNormalized roundtrip', () {
+      test('0.0 normalized maps to 0.0 widget X', () {
+        final result = LayoutCoordinateService.normalizedToWidgetX(
+          normalizedX: 0.0,
+          contentWidth: contentWidth,
+        );
+        expect(result, 0.0);
+      });
+
+      test('1.0 normalized maps to contentWidth', () {
+        final result = LayoutCoordinateService.normalizedToWidgetX(
+          normalizedX: 1.0,
+          contentWidth: contentWidth,
+        );
+        expect(result, contentWidth);
+      });
+
+      test('roundtrip normalized → widget → normalized', () {
+        const normalizedX = 0.35;
+        final widgetX = LayoutCoordinateService.normalizedToWidgetX(
+          normalizedX: normalizedX,
+          contentWidth: contentWidth,
+        );
+        final result = LayoutCoordinateService.widgetXToNormalized(
+          widgetX: widgetX,
+          contentWidth: contentWidth,
+        );
+        expect(result, closeTo(normalizedX, 0.0001));
+      });
+    });
+
+    group('widgetXToNormalized', () {
+      test('clamps negative widget X to 0.0', () {
+        final result = LayoutCoordinateService.widgetXToNormalized(
+          widgetX: -50.0,
+          contentWidth: contentWidth,
+        );
+        expect(result, 0.0);
+      });
+
+      test('clamps widget X > contentWidth to 1.0', () {
+        final result = LayoutCoordinateService.widgetXToNormalized(
+          widgetX: contentWidth + 100,
+          contentWidth: contentWidth,
+        );
+        expect(result, 1.0);
+      });
+
+      test('returns 0.0 when contentWidth is 0', () {
+        final result = LayoutCoordinateService.widgetXToNormalized(
+          widgetX: 50.0,
+          contentWidth: 0.0,
+        );
+        expect(result, 0.0);
+      });
+    });
+
+    group('calculateItemWidth', () {
+      test('normalized width * content width', () {
+        final result = LayoutCoordinateService.calculateItemWidth(
+          normalizedWidth: 0.25,
+          contentWidth: contentWidth,
+        );
+        expect(result, 250.0);
+      });
+
+      test('clamps to 0 for negative input', () {
+        final result = LayoutCoordinateService.calculateItemWidth(
+          normalizedWidth: -0.1,
+          contentWidth: contentWidth,
+        );
+        expect(result, 0.0);
+      });
+    });
+
+    group('laneToY / yToLane', () {
+      test('lane 1 starts at Y=0', () {
+        final y = LayoutCoordinateService.laneToY(
+          lane: 1,
+          laneHeight: laneHeight,
+        );
+        expect(y, 0.0);
+      });
+
+      test('lane 2 includes lane height + spacing', () {
+        final y = LayoutCoordinateService.laneToY(
+          lane: 2,
+          laneHeight: laneHeight,
+        );
+        expect(y, laneHeight + ZTimelineConstants.laneVerticalSpacing);
+      });
+
+      test('yToLane roundtrip from laneToY', () {
+        for (var lane = 1; lane <= 5; lane++) {
+          final y = LayoutCoordinateService.laneToY(
+            lane: lane,
+            laneHeight: laneHeight,
+          );
+          // Add a small offset within the lane to test mid-lane Y
+          final recoveredLane = LayoutCoordinateService.yToLane(
+            y: y + laneHeight / 2,
+            laneHeight: laneHeight,
+          );
+          expect(recoveredLane, lane);
+        }
+      });
+
+      test('yToLane at lane boundary returns correct lane', () {
+        final lane = LayoutCoordinateService.yToLane(
+          y: 0.0,
+          laneHeight: laneHeight,
+        );
+        expect(lane, 1);
+      });
+    });
+  });
+}

packages/z-flutter/packages/z_timeline/test/services/time_scale_service_test.dart

@@ -0,0 +1,222 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:z_timeline/src/services/time_scale_service.dart';
+
+import '../helpers/test_constants.dart';
+
+void main() {
+  group('TimeScaleService', () {
+    group('mapTimeToPosition', () {
+      test('domain start maps to 0.0', () {
+        final result = TimeScaleService.mapTimeToPosition(
+          kDomainStart,
+          kDomainStart,
+          kDomainEnd,
+        );
+        expect(result, 0.0);
+      });
+
+      test('domain end maps to 1.0', () {
+        final result = TimeScaleService.mapTimeToPosition(
+          kDomainEnd,
+          kDomainStart,
+          kDomainEnd,
+        );
+        expect(result, 1.0);
+      });
+
+      test('midpoint maps to ~0.5', () {
+        final mid = kDomainStart.add(
+          kDomainEnd.difference(kDomainStart) ~/ 2,
+        );
+        final result = TimeScaleService.mapTimeToPosition(
+          mid,
+          kDomainStart,
+          kDomainEnd,
+        );
+        expect(result, closeTo(0.5, 0.001));
+      });
+
+      test('before domain returns negative', () {
+        final before = kDomainStart.subtract(const Duration(days: 1));
+        final result = TimeScaleService.mapTimeToPosition(
+          before,
+          kDomainStart,
+          kDomainEnd,
+        );
+        expect(result, lessThan(0.0));
+      });
+
+      test('after domain returns >1', () {
+        final after = kDomainEnd.add(const Duration(days: 1));
+        final result = TimeScaleService.mapTimeToPosition(
+          after,
+          kDomainStart,
+          kDomainEnd,
+        );
+        expect(result, greaterThan(1.0));
+      });
+    });
+
+    group('mapPositionToTime', () {
+      test('position 0 maps to domain start', () {
+        final result = TimeScaleService.mapPositionToTime(
+          0.0,
+          kDomainStart,
+          kDomainEnd,
+        );
+        expect(
+          result.millisecondsSinceEpoch,
+          kDomainStart.millisecondsSinceEpoch,
+        );
+      });
+
+      test('position 1 maps to domain end', () {
+        final result = TimeScaleService.mapPositionToTime(
+          1.0,
+          kDomainStart,
+          kDomainEnd,
+        );
+        expect(
+          result.millisecondsSinceEpoch,
+          kDomainEnd.millisecondsSinceEpoch,
+        );
+      });
+
+      test('roundtrip with mapTimeToPosition', () {
+        final time = kAnchor;
+        final position = TimeScaleService.mapTimeToPosition(
+          time,
+          kDomainStart,
+          kDomainEnd,
+        );
+        final result = TimeScaleService.mapPositionToTime(
+          position,
+          kDomainStart,
+          kDomainEnd,
+        );
+        // Allow 1ms tolerance for rounding
+        expect(
+          result.millisecondsSinceEpoch,
+          closeTo(time.millisecondsSinceEpoch, 1),
+        );
+      });
+    });
+
+    group('domainDuration', () {
+      test('30-day domain returns correct milliseconds', () {
+        final result = TimeScaleService.domainDuration(
+          kDomainStart,
+          kDomainEnd,
+        );
+        // June has 30 days
+        const expectedMs = 30 * 24 * 60 * 60 * 1000;
+        expect(result, expectedMs.toDouble());
+      });
+    });
+
+    group('calculateZoomedDomain', () {
+      test('factor > 1 shrinks domain (zoom in)', () {
+        final result = TimeScaleService.calculateZoomedDomain(
+          kDomainStart,
+          kDomainEnd,
+          factor: 2.0,
+        );
+        final originalDuration = kDomainEnd.difference(kDomainStart);
+        final newDuration = result.end.difference(result.start);
+        expect(
+          newDuration.inMilliseconds,
+          closeTo(originalDuration.inMilliseconds / 2, 1),
+        );
+      });
+
+      test('factor < 1 expands domain (zoom out)', () {
+        final result = TimeScaleService.calculateZoomedDomain(
+          kDomainStart,
+          kDomainEnd,
+          factor: 0.5,
+        );
+        final originalDuration = kDomainEnd.difference(kDomainStart);
+        final newDuration = result.end.difference(result.start);
+        expect(
+          newDuration.inMilliseconds,
+          closeTo(originalDuration.inMilliseconds * 2, 1),
+        );
+      });
+
+      test('factor = 1 leaves domain unchanged', () {
+        final result = TimeScaleService.calculateZoomedDomain(
+          kDomainStart,
+          kDomainEnd,
+          factor: 1.0,
+        );
+        expect(
+          result.start.millisecondsSinceEpoch,
+          closeTo(kDomainStart.millisecondsSinceEpoch, 1),
+        );
+        expect(
+          result.end.millisecondsSinceEpoch,
+          closeTo(kDomainEnd.millisecondsSinceEpoch, 1),
+        );
+      });
+
+      test('focus position is preserved', () {
+        const focusPosition = 0.25;
+        final focusTime = TimeScaleService.mapPositionToTime(
+          focusPosition,
+          kDomainStart,
+          kDomainEnd,
+        );
+
+        final result = TimeScaleService.calculateZoomedDomain(
+          kDomainStart,
+          kDomainEnd,
+          factor: 2.0,
+          focusPosition: focusPosition,
+        );
+
+        final newFocusPosition = TimeScaleService.mapTimeToPosition(
+          focusTime,
+          result.start,
+          result.end,
+        );
+        expect(newFocusPosition, closeTo(focusPosition, 0.001));
+      });
+    });
+
+    group('calculatePannedDomain', () {
+      test('positive ratio shifts forward', () {
+        final result = TimeScaleService.calculatePannedDomain(
+          kDomainStart,
+          kDomainEnd,
+          ratio: 0.1,
+        );
+        expect(result.start.isAfter(kDomainStart), isTrue);
+        expect(result.end.isAfter(kDomainEnd), isTrue);
+      });
+
+      test('negative ratio shifts backward', () {
+        final result = TimeScaleService.calculatePannedDomain(
+          kDomainStart,
+          kDomainEnd,
+          ratio: -0.1,
+        );
+        expect(result.start.isBefore(kDomainStart), isTrue);
+        expect(result.end.isBefore(kDomainEnd), isTrue);
+      });
+
+      test('duration is preserved', () {
+        final originalDuration = kDomainEnd.difference(kDomainStart);
+        final result = TimeScaleService.calculatePannedDomain(
+          kDomainStart,
+          kDomainEnd,
+          ratio: 0.3,
+        );
+        final newDuration = result.end.difference(result.start);
+        expect(
+          newDuration.inMilliseconds,
+          closeTo(originalDuration.inMilliseconds, 1),
+        );
+      });
+    });
+  });
+}

packages/z-flutter/packages/z_timeline/test/state/timeline_interaction_notifier_test.dart

@@ -0,0 +1,291 @@
+import 'dart:ui';
+
+import 'package:flutter_test/flutter_test.dart';
+import 'package:z_timeline/src/models/entry_resize_state.dart';
+import 'package:z_timeline/src/state/timeline_interaction_notifier.dart';
+
+import '../helpers/test_constants.dart';
+import '../helpers/test_factories.dart';
+
+void main() {
+  group('ZTimelineInteractionNotifier', () {
+    late ZTimelineInteractionNotifier notifier;
+
+    setUp(() {
+      notifier = ZTimelineInteractionNotifier();
+    });
+
+    tearDown(() {
+      notifier.dispose();
+    });
+
+    group('initial state', () {
+      test('all flags are false', () {
+        expect(notifier.isGrabbing, isFalse);
+        expect(notifier.isDraggingEntry, isFalse);
+        expect(notifier.isResizingEntry, isFalse);
+        expect(notifier.isInteracting, isFalse);
+      });
+
+      test('all states are null', () {
+        expect(notifier.dragState, isNull);
+        expect(notifier.resizeState, isNull);
+        expect(notifier.hoveredEntryId, isNull);
+        expect(notifier.hoveredPillGlobalRect, isNull);
+        expect(notifier.interactionGlobalPosition, isNull);
+      });
+    });
+
+    group('hover', () {
+      test('setHoveredEntry sets id and rect and notifies', () {
+        var notifyCount = 0;
+        notifier.addListener(() => notifyCount++);
+
+        const rect = Rect.fromLTWH(10, 20, 100, 30);
+        notifier.setHoveredEntry('entry-1', rect);
+
+        expect(notifier.hoveredEntryId, 'entry-1');
+        expect(notifier.hoveredPillGlobalRect, rect);
+        expect(notifyCount, 1);
+      });
+
+      test('duplicate setHoveredEntry is no-op', () {
+        const rect = Rect.fromLTWH(10, 20, 100, 30);
+        notifier.setHoveredEntry('entry-1', rect);
+
+        var notifyCount = 0;
+        notifier.addListener(() => notifyCount++);
+
+        notifier.setHoveredEntry('entry-1', rect);
+        expect(notifyCount, 0);
+      });
+
+      test('clearHoveredEntry clears and notifies', () {
+        notifier.setHoveredEntry('entry-1', const Rect.fromLTWH(0, 0, 50, 20));
+
+        var notifyCount = 0;
+        notifier.addListener(() => notifyCount++);
+
+        notifier.clearHoveredEntry();
+        expect(notifier.hoveredEntryId, isNull);
+        expect(notifier.hoveredPillGlobalRect, isNull);
+        expect(notifyCount, 1);
+      });
+
+      test('clearHoveredEntry when already null is no-op', () {
+        var notifyCount = 0;
+        notifier.addListener(() => notifyCount++);
+
+        notifier.clearHoveredEntry();
+        expect(notifyCount, 0);
+      });
+    });
+
+    group('grabbing', () {
+      test('setGrabbing(true) toggles and notifies', () {
+        var notifyCount = 0;
+        notifier.addListener(() => notifyCount++);
+
+        notifier.setGrabbing(true);
+        expect(notifier.isGrabbing, isTrue);
+        expect(notifyCount, 1);
+      });
+
+      test('setGrabbing(false) toggles and notifies', () {
+        notifier.setGrabbing(true);
+
+        var notifyCount = 0;
+        notifier.addListener(() => notifyCount++);
+
+        notifier.setGrabbing(false);
+        expect(notifier.isGrabbing, isFalse);
+        expect(notifyCount, 1);
+      });
+
+      test('duplicate setGrabbing is no-op', () {
+        var notifyCount = 0;
+        notifier.addListener(() => notifyCount++);
+
+        notifier.setGrabbing(false); // already false
+        expect(notifyCount, 0);
+      });
+    });
+
+    group('drag lifecycle', () {
+      test('beginDrag sets dragState and isDraggingEntry and clears hover', () {
+        notifier.setHoveredEntry('entry-1', const Rect.fromLTWH(0, 0, 50, 20));
+
+        var notifyCount = 0;
+        notifier.addListener(() => notifyCount++);
+
+        final entry = makeEntry(id: 'entry-1');
+        notifier.beginDrag(entry);
+
+        expect(notifier.isDraggingEntry, isTrue);
+        expect(notifier.dragState, isNotNull);
+        expect(notifier.dragState!.entryId, 'entry-1');
+        expect(notifier.hoveredEntryId, isNull);
+        expect(notifyCount, greaterThan(0));
+      });
+
+      test('updateDragTarget updates target', () {
+        final entry = makeEntry();
+        notifier.beginDrag(entry);
+
+        var notifyCount = 0;
+        notifier.addListener(() => notifyCount++);
+
+        final newStart = kAnchor.add(const Duration(hours: 5));
+        notifier.updateDragTarget(
+          targetGroupId: 'group-2',
+          targetLane: 3,
+          targetStart: newStart,
+        );
+
+        expect(notifier.dragState!.targetGroupId, 'group-2');
+        expect(notifier.dragState!.targetLane, 3);
+        expect(notifier.dragState!.targetStart, newStart);
+        expect(notifyCount, 1);
+      });
+
+      test('updateDragTarget is no-op without active drag', () {
+        var notifyCount = 0;
+        notifier.addListener(() => notifyCount++);
+
+        notifier.updateDragTarget(
+          targetGroupId: 'group-1',
+          targetLane: 1,
+          targetStart: kAnchor,
+        );
+        expect(notifyCount, 0);
+      });
+
+      test('endDrag clears all drag state', () {
+        final entry = makeEntry();
+        notifier.beginDrag(entry);
+        notifier.updateInteractionPosition(const Offset(100, 200));
+
+        notifier.endDrag();
+
+        expect(notifier.isDraggingEntry, isFalse);
+        expect(notifier.dragState, isNull);
+        expect(notifier.interactionGlobalPosition, isNull);
+      });
+    });
+
+    group('resize lifecycle', () {
+      test(
+        'beginResize sets resizeState and isResizingEntry and clears hover',
+        () {
+          notifier.setHoveredEntry(
+            'entry-1',
+            const Rect.fromLTWH(0, 0, 50, 20),
+          );
+
+          var notifyCount = 0;
+          notifier.addListener(() => notifyCount++);
+
+          final entry = makeEntry(id: 'entry-1');
+          notifier.beginResize(entry, ResizeEdge.start);
+
+          expect(notifier.isResizingEntry, isTrue);
+          expect(notifier.resizeState, isNotNull);
+          expect(notifier.resizeState!.edge, ResizeEdge.start);
+          expect(notifier.hoveredEntryId, isNull);
+          expect(notifyCount, greaterThan(0));
+        },
+      );
+
+      test('updateResizeTarget updates targets', () {
+        final entry = makeEntry();
+        notifier.beginResize(entry, ResizeEdge.end);
+
+        var notifyCount = 0;
+        notifier.addListener(() => notifyCount++);
+
+        final newStart = kAnchor.subtract(const Duration(hours: 1));
+        final newEnd = kAnchor.add(const Duration(hours: 5));
+        notifier.updateResizeTarget(
+          targetStart: newStart,
+          targetEnd: newEnd,
+          targetLane: 2,
+        );
+
+        expect(notifier.resizeState!.targetStart, newStart);
+        expect(notifier.resizeState!.targetEnd, newEnd);
+        expect(notifier.resizeState!.targetLane, 2);
+        expect(notifyCount, 1);
+      });
+
+      test('updateResizeTarget is no-op without active resize', () {
+        var notifyCount = 0;
+        notifier.addListener(() => notifyCount++);
+
+        notifier.updateResizeTarget(
+          targetStart: kAnchor,
+          targetEnd: kAnchor.add(const Duration(hours: 1)),
+        );
+        expect(notifyCount, 0);
+      });
+
+      test('endResize clears all resize state', () {
+        final entry = makeEntry();
+        notifier.beginResize(entry, ResizeEdge.end);
+        notifier.updateInteractionPosition(const Offset(100, 200));
+
+        notifier.endResize();
+
+        expect(notifier.isResizingEntry, isFalse);
+        expect(notifier.resizeState, isNull);
+        expect(notifier.interactionGlobalPosition, isNull);
+      });
+    });
+
+    group('cancelDrag / cancelResize', () {
+      test('cancelDrag clears same as endDrag', () {
+        final entry = makeEntry();
+        notifier.beginDrag(entry);
+
+        notifier.cancelDrag();
+
+        expect(notifier.isDraggingEntry, isFalse);
+        expect(notifier.dragState, isNull);
+      });
+
+      test('cancelResize clears same as endResize', () {
+        final entry = makeEntry();
+        notifier.beginResize(entry, ResizeEdge.start);
+
+        notifier.cancelResize();
+
+        expect(notifier.isResizingEntry, isFalse);
+        expect(notifier.resizeState, isNull);
+      });
+    });
+
+    group('isInteracting', () {
+      test('true during drag', () {
+        final entry = makeEntry();
+        notifier.beginDrag(entry);
+        expect(notifier.isInteracting, isTrue);
+      });
+
+      test('true during resize', () {
+        final entry = makeEntry();
+        notifier.beginResize(entry, ResizeEdge.end);
+        expect(notifier.isInteracting, isTrue);
+      });
+
+      test('false when idle', () {
+        expect(notifier.isInteracting, isFalse);
+      });
+
+      test('false after ending drag', () {
+        final entry = makeEntry();
+        notifier.beginDrag(entry);
+        notifier.endDrag();
+        expect(notifier.isInteracting, isFalse);
+      });
+    });
+  });
+}

packages/z-flutter/packages/z_timeline/test/state/timeline_viewport_notifier_test.dart

@@ -0,0 +1,163 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:z_timeline/src/state/timeline_viewport_notifier.dart';
+
+import '../helpers/test_constants.dart';
+
+void main() {
+  group('TimelineViewportNotifier', () {
+    late TimelineViewportNotifier notifier;
+
+    setUp(() {
+      notifier = TimelineViewportNotifier(start: kDomainStart, end: kDomainEnd);
+    });
+
+    tearDown(() {
+      notifier.dispose();
+    });
+
+    group('construction', () {
+      test('stores start and end correctly', () {
+        expect(notifier.start, kDomainStart);
+        expect(notifier.end, kDomainEnd);
+      });
+
+      test('asserts on invalid domain (start >= end)', () {
+        expect(
+          () => TimelineViewportNotifier(start: kDomainEnd, end: kDomainStart),
+          throwsAssertionError,
+        );
+      });
+    });
+
+    group('setDomain', () {
+      test('updates and notifies', () {
+        var notifyCount = 0;
+        notifier.addListener(() => notifyCount++);
+
+        final newStart = kDomainStart.add(const Duration(days: 1));
+        final newEnd = kDomainEnd.subtract(const Duration(days: 1));
+        notifier.setDomain(newStart, newEnd);
+
+        expect(notifier.start, newStart);
+        expect(notifier.end, newEnd);
+        expect(notifyCount, 1);
+      });
+
+      test('no-op if unchanged', () {
+        var notifyCount = 0;
+        notifier.addListener(() => notifyCount++);
+
+        notifier.setDomain(kDomainStart, kDomainEnd);
+        expect(notifyCount, 0);
+      });
+
+      test('rejects invalid domain (start >= end)', () {
+        var notifyCount = 0;
+        notifier.addListener(() => notifyCount++);
+
+        notifier.setDomain(kDomainEnd, kDomainStart);
+        expect(notifier.start, kDomainStart);
+        expect(notifier.end, kDomainEnd);
+        expect(notifyCount, 0);
+      });
+
+      test('rejects equal start and end', () {
+        var notifyCount = 0;
+        notifier.addListener(() => notifyCount++);
+
+        notifier.setDomain(kDomainStart, kDomainStart);
+        expect(notifyCount, 0);
+      });
+    });
+
+    group('zoom', () {
+      test('factor > 1 shrinks domain', () {
+        var notifyCount = 0;
+        notifier.addListener(() => notifyCount++);
+
+        final originalDuration = notifier.end.difference(notifier.start);
+        notifier.zoom(2.0);
+        final newDuration = notifier.end.difference(notifier.start);
+
+        expect(
+          newDuration.inMilliseconds,
+          closeTo(originalDuration.inMilliseconds / 2, 1),
+        );
+        expect(notifyCount, 1);
+      });
+
+      test('factor < 1 expands domain', () {
+        var notifyCount = 0;
+        notifier.addListener(() => notifyCount++);
+
+        final originalDuration = notifier.end.difference(notifier.start);
+        notifier.zoom(0.5);
+        final newDuration = notifier.end.difference(notifier.start);
+
+        expect(
+          newDuration.inMilliseconds,
+          closeTo(originalDuration.inMilliseconds * 2, 1),
+        );
+        expect(notifyCount, 1);
+      });
+    });
+
+    group('pan', () {
+      test('shifts domain forward', () {
+        var notifyCount = 0;
+        notifier.addListener(() => notifyCount++);
+
+        notifier.pan(0.1);
+        expect(notifier.start.isAfter(kDomainStart), isTrue);
+        expect(notifier.end.isAfter(kDomainEnd), isTrue);
+        expect(notifyCount, 1);
+      });
+
+      test('shifts domain backward', () {
+        notifier.pan(-0.1);
+        expect(notifier.start.isBefore(kDomainStart), isTrue);
+        expect(notifier.end.isBefore(kDomainEnd), isTrue);
+      });
+
+      test('preserves duration', () {
+        final originalDuration = notifier.end.difference(notifier.start);
+        notifier.pan(0.25);
+        final newDuration = notifier.end.difference(notifier.start);
+        expect(
+          newDuration.inMilliseconds,
+          closeTo(originalDuration.inMilliseconds, 1),
+        );
+      });
+    });
+
+    group('listener counting', () {
+      test('exactly one notification per valid mutation', () {
+        var notifyCount = 0;
+        notifier.addListener(() => notifyCount++);
+
+        notifier.pan(0.1);
+        expect(notifyCount, 1);
+
+        notifier.zoom(1.5);
+        expect(notifyCount, 2);
+
+        final newStart = notifier.start.add(const Duration(days: 1));
+        final newEnd = notifier.end.add(const Duration(days: 1));
+        notifier.setDomain(newStart, newEnd);
+        expect(notifyCount, 3);
+      });
+
+      test('zero notifications for no-ops', () {
+        var notifyCount = 0;
+        notifier.addListener(() => notifyCount++);
+
+        // setDomain with same values
+        notifier.setDomain(kDomainStart, kDomainEnd);
+        // setDomain with invalid values
+        notifier.setDomain(kDomainEnd, kDomainStart);
+
+        expect(notifyCount, 0);
+      });
+    });
+  });
+}

packages/z-flutter/packages/z_timeline/test/widgets/interactive_event_pill_test.dart

@@ -0,0 +1,335 @@
+import 'package:flutter/gestures.dart';
+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:z_timeline/src/constants.dart';
+import 'package:z_timeline/src/models/entry_resize_state.dart';
+import 'package:z_timeline/src/models/timeline_entry.dart';
+import 'package:z_timeline/src/services/layout_coordinate_service.dart';
+import 'package:z_timeline/src/services/time_scale_service.dart';
+import 'package:z_timeline/src/state/timeline_viewport_notifier.dart';
+import 'package:z_timeline/src/widgets/event_pill.dart';
+import 'package:z_timeline/src/widgets/interactive_event_pill.dart';
+import 'package:z_timeline/src/widgets/timeline_scope.dart';
+
+import '../helpers/test_constants.dart';
+import '../helpers/test_factories.dart';
+import '../helpers/timeline_test_harness.dart';
+
+void main() {
+  group('InteractiveEventPill', () {
+    const contentWidth = 800.0;
+    const laneHeight = ZTimelineConstants.laneHeight;
+
+    late TimelineViewportNotifier viewport;
+
+    setUp(() {
+      viewport = TimelineViewportNotifier(start: kDomainStart, end: kDomainEnd);
+    });
+
+    tearDown(() {
+      viewport.dispose();
+    });
+
+    /// Helper to pump an InteractiveEventPill in a test harness.
+    Future<void> pumpPill(
+      WidgetTester tester, {
+      TimelineEntry? entry,
+      bool enableDrag = true,
+      List<TimelineEntry> allEntries = const [],
+      void Function(TimelineEntry, DateTime, String, int)? onEntryMoved,
+      void Function(TimelineEntry, DateTime, DateTime, int)? onEntryResized,
+    }) async {
+      final testEntry = entry ?? makeEntry();
+
+      await tester.pumpTimeline(
+        SizedBox(
+          width: contentWidth,
+          height: 200,
+          child: Stack(
+            children: [
+              InteractiveEventPill(
+                entry: testEntry,
+                laneHeight: laneHeight,
+                labelBuilder: (e) => e.id,
+                colorBuilder: (_) => Colors.blue,
+                contentWidth: contentWidth,
+                enableDrag: enableDrag,
+                viewport: viewport,
+                allEntries: allEntries,
+                onEntryMoved: onEntryMoved,
+                onEntryResized: onEntryResized,
+              ),
+            ],
+          ),
+        ),
+        viewport: viewport,
+      );
+    }
+
+    group('rendering', () {
+      testWidgets('pill appears at correct position', (tester) async {
+        final testEntry = makeEntry(lane: 2);
+
+        await pumpPill(tester, entry: testEntry);
+
+        final positioned = tester.widget<Positioned>(
+          find
+              .ancestor(
+                of: find.byType(EventPill),
+                matching: find.byType(Positioned),
+              )
+              .first,
+        );
+
+        final expectedTop = LayoutCoordinateService.laneToY(
+          lane: 2,
+          laneHeight: laneHeight,
+        );
+        final startX = TimeScaleService.mapTimeToPosition(
+          testEntry.start,
+          viewport.start,
+          viewport.end,
+        );
+        final endX = TimeScaleService.mapTimeToPosition(
+          testEntry.end,
+          viewport.start,
+          viewport.end,
+        );
+        final expectedLeft = LayoutCoordinateService.normalizedToWidgetX(
+          normalizedX: startX,
+          contentWidth: contentWidth,
+        );
+        final expectedWidth = LayoutCoordinateService.calculateItemWidth(
+          normalizedWidth: (endX - startX).clamp(0.0, double.infinity),
+          contentWidth: contentWidth,
+        );
+
+        expect(positioned.top, expectedTop);
+        expect(positioned.left, closeTo(expectedLeft, 0.1));
+        expect(positioned.width, closeTo(expectedWidth, 0.1));
+        expect(positioned.height, laneHeight);
+      });
+
+      testWidgets('enableDrag=false still renders pill', (tester) async {
+        await pumpPill(tester, enableDrag: false);
+
+        expect(find.byType(EventPill), findsOneWidget);
+        // No GestureDetector when drag is disabled
+        expect(
+          find.descendant(
+            of: find.byType(InteractiveEventPill),
+            matching: find.byType(GestureDetector),
+          ),
+          findsNothing,
+        );
+      });
+    });
+
+    group('hover', () {
+      testWidgets('mouse enter calls setHoveredEntry', (tester) async {
+        await pumpPill(tester);
+
+        final pillFinder = find.byType(EventPill);
+        final gesture = await tester.createGesture(
+          kind: PointerDeviceKind.mouse,
+        );
+        await gesture.addPointer(location: Offset.zero);
+        addTearDown(gesture.removePointer);
+        await tester.pump();
+
+        await gesture.moveTo(tester.getCenter(pillFinder));
+        await tester.pump();
+
+        final scope = ZTimelineScope.of(
+          tester.element(find.byType(InteractiveEventPill)),
+        );
+        expect(scope.interaction.hoveredEntryId, isNotNull);
+      });
+
+      testWidgets('mouse exit calls clearHoveredEntry', (tester) async {
+        await pumpPill(tester);
+
+        final pillFinder = find.byType(EventPill);
+        final gesture = await tester.createGesture(
+          kind: PointerDeviceKind.mouse,
+        );
+        await gesture.addPointer(location: Offset.zero);
+        addTearDown(gesture.removePointer);
+        await tester.pump();
+
+        // Enter
+        await gesture.moveTo(tester.getCenter(pillFinder));
+        await tester.pump();
+
+        // Exit
+        await gesture.moveTo(Offset.zero);
+        await tester.pump();
+
+        final scope = ZTimelineScope.of(
+          tester.element(find.byType(InteractiveEventPill)),
+        );
+        expect(scope.interaction.hoveredEntryId, isNull);
+      });
+    });
+
+    group('drag flow', () {
+      testWidgets('pan from center triggers beginDrag', (tester) async {
+        final testEntry = makeEntry();
+
+        await pumpPill(tester, entry: testEntry);
+
+        final pillCenter = tester.getCenter(find.byType(EventPill));
+
+        // Simulate pan gesture
+        await tester.timedDragFrom(
+          pillCenter,
+          const Offset(20, 0),
+          const Duration(milliseconds: 200),
+        );
+        await tester.pump();
+
+        // After drag ends, state should be cleared
+        final scope = ZTimelineScope.of(
+          tester.element(find.byType(InteractiveEventPill)),
+        );
+        expect(scope.interaction.isDraggingEntry, isFalse);
+      });
+    });
+
+    group('resize', () {
+      // Resize tests need a pill wide enough for resize handles (>= 16px).
+      // With a 30-day viewport and 800px contentWidth, a 7-day entry gives
+      // ~186px — well above the 16px threshold.
+      TimelineEntry makeWideEntry() => makeEntry(
+            start: kAnchor,
+            end: kAnchor.add(const Duration(days: 7)),
+          );
+
+      testWidgets('pan from left edge triggers resize start', (tester) async {
+        final testEntry = makeWideEntry();
+
+        TimelineEntry? resizedEntry;
+        await pumpPill(
+          tester,
+          entry: testEntry,
+          onEntryResized: (entry, newStart, newEnd, newLane) {
+            resizedEntry = entry;
+          },
+        );
+
+        // Get the pill's left edge position (within first 6px)
+        final pillRect = tester.getRect(find.byType(EventPill));
+        final leftEdge = Offset(pillRect.left + 3, pillRect.center.dy);
+
+        await tester.timedDragFrom(
+          leftEdge,
+          const Offset(-20, 0),
+          const Duration(milliseconds: 200),
+        );
+        await tester.pump();
+
+        expect(resizedEntry, isNotNull);
+      });
+
+      testWidgets('pan from right edge triggers resize end', (tester) async {
+        final testEntry = makeWideEntry();
+
+        TimelineEntry? resizedEntry;
+        await pumpPill(
+          tester,
+          entry: testEntry,
+          onEntryResized: (entry, newStart, newEnd, newLane) {
+            resizedEntry = entry;
+          },
+        );
+
+        final pillRect = tester.getRect(find.byType(EventPill));
+        final rightEdge = Offset(pillRect.right - 3, pillRect.center.dy);
+
+        await tester.timedDragFrom(
+          rightEdge,
+          const Offset(20, 0),
+          const Duration(milliseconds: 200),
+        );
+        await tester.pump();
+
+        expect(resizedEntry, isNotNull);
+      });
+
+      testWidgets('narrow pill (< 16px) always uses drag mode', (tester) async {
+        // Make a very narrow pill (< 16px) — start close to end
+        final narrowStart = kAnchor;
+        final viewDuration =
+            kDomainEnd.difference(kDomainStart).inMilliseconds;
+        // 15px out of 800px contentWidth → 15/800 = 0.01875 of normalized
+        final narrowDurationMs = (0.01875 * viewDuration).round();
+        final narrowEnd = narrowStart.add(
+          Duration(milliseconds: narrowDurationMs),
+        );
+        final testEntry = makeEntry(start: narrowStart, end: narrowEnd);
+
+        TimelineEntry? resizedEntry;
+        await pumpPill(
+          tester,
+          entry: testEntry,
+          onEntryResized: (entry, newStart, newEnd, newLane) {
+            resizedEntry = entry;
+          },
+        );
+
+        final pillCenter = tester.getCenter(find.byType(EventPill));
+        await tester.timedDragFrom(
+          pillCenter,
+          const Offset(20, 0),
+          const Duration(milliseconds: 200),
+        );
+        await tester.pump();
+
+        // Should not have triggered resize
+        expect(resizedEntry, isNull);
+      });
+    });
+
+    group('opacity', () {
+      testWidgets('pill at 1.0 opacity when idle', (tester) async {
+        await pumpPill(tester);
+
+        final opacity = tester.widget<Opacity>(find.byType(Opacity));
+        expect(opacity.opacity, 1.0);
+      });
+
+      testWidgets('pill at 0.3 opacity during drag', (tester) async {
+        final testEntry = makeEntry();
+        await pumpPill(tester, entry: testEntry);
+
+        // Start a drag by triggering beginDrag on the notifier directly
+        final scope = ZTimelineScope.of(
+          tester.element(find.byType(InteractiveEventPill)),
+        );
+        scope.interaction.beginDrag(testEntry);
+        await tester.pump();
+
+        final opacity = tester.widget<Opacity>(find.byType(Opacity));
+        expect(opacity.opacity, 0.3);
+      });
+
+      testWidgets('pill at 0.3 opacity during resize', (tester) async {
+        final testEntry = makeEntry();
+        await pumpPill(
+          tester,
+          entry: testEntry,
+          onEntryResized: (_, _, _, _) {},
+        );
+
+        final scope = ZTimelineScope.of(
+          tester.element(find.byType(InteractiveEventPill)),
+        );
+        scope.interaction.beginResize(testEntry, ResizeEdge.end);
+        await tester.pump();
+
+        final opacity = tester.widget<Opacity>(find.byType(Opacity));
+        expect(opacity.opacity, 0.3);
+      });
+    });
+  });
+}

packages/z-flutter/scripts/copy-build.mjs

@@ -1,6 +1,14 @@
-import { cpSync, readFileSync, writeFileSync } from "node:fs";
+import {
+  copyFileSync,
+  cpSync,
+  existsSync,
+  readFileSync,
+  realpathSync,
+  writeFileSync,
+} from "node:fs";
 import { resolve, dirname } from "node:path";
 import { fileURLToPath } from "node:url";
+import { execFileSync } from "node:child_process";
 
 const __dirname = dirname(fileURLToPath(import.meta.url));
 const src = resolve(__dirname, "../build/web");
@@ -9,6 +17,22 @@ const dest = resolve(__dirname, "../../../apps/web/public/flutter");
 cpSync(src, dest, { recursive: true });
 console.log(`Copied Flutter build: ${src} → ${dest}`);
 
+// Copy flutter.js.map from the Flutter SDK (not included in build output)
+const flutterBin = execFileSync("which", ["flutter"], {
+  encoding: "utf-8",
+}).trim();
+const sdkBinDir = dirname(realpathSync(flutterBin));
+const flutterJsMap = resolve(
+  sdkBinDir,
+  "cache/flutter_web_sdk/flutter_js/flutter.js.map",
+);
+if (existsSync(flutterJsMap)) {
+  copyFileSync(flutterJsMap, resolve(dest, "flutter.js.map"));
+  console.log("Copied flutter.js.map from SDK");
+} else {
+  console.warn(`flutter.js.map not found at ${flutterJsMap}`);
+}
+
 // Extract buildConfig from flutter_bootstrap.js so the React app can fetch it
 const bootstrap = readFileSync(resolve(dest, "flutter_bootstrap.js"), "utf-8");
 const match = bootstrap.match(/_flutter\.buildConfig\s*=\s*({.*?});/);

packages/z-flutter/web/index.html

@@ -1,46 +1,410 @@
 <!DOCTYPE html>
 <html>
 <head>
-  <!--
-    If you are serving your web app in a path other than the root, change the
-    href value below to reflect the base path you are serving from.
-
-    The path provided below has to start and end with a slash "/" in order for
-    it to work correctly.
-
-    For more details:
-    * https://developer.mozilla.org/en-US/docs/Web/HTML/Element/base
-
-    This is a placeholder for base href that will be replaced by the value of
-    the `--base-href` argument provided to `flutter build`.
-  -->
   <base href="$FLUTTER_BASE_HREF">
-
   <meta charset="UTF-8">
   <meta content="IE=Edge" http-equiv="X-UA-Compatible">
-  <meta name="description" content="A new Flutter project.">
-
-  <!-- iOS meta tags & icons -->
+  <meta name="description" content="Zendegi Timeline - Dev Mode">
   <meta name="mobile-web-app-capable" content="yes">
   <meta name="apple-mobile-web-app-status-bar-style" content="black">
   <meta name="apple-mobile-web-app-title" content="z_flutter">
   <link rel="apple-touch-icon" href="icons/Icon-192.png">
-
-  <!-- Favicon -->
   <link rel="icon" type="image/png" href="favicon.png"/>
-
-  <title>z_flutter</title>
+  <title>Zendegi Timeline (Dev)</title>
   <link rel="manifest" href="manifest.json">
+  <style>
+    * { margin: 0; padding: 0; box-sizing: border-box; }
+    body {
+      font-family: system-ui, -apple-system, sans-serif;
+      background: #1a1a2e;
+      color: #e0e0e0;
+      display: flex;
+      flex-direction: column;
+      height: 100vh;
+    }
+    #toolbar {
+      display: flex;
+      align-items: center;
+      gap: 8px;
+      padding: 8px 12px;
+      background: #16213e;
+      border-bottom: 1px solid #0f3460;
+      font-size: 13px;
+      flex-shrink: 0;
+      flex-wrap: wrap;
+    }
+    #toolbar .group { display: flex; align-items: center; gap: 4px; }
+    #toolbar label { color: #8899aa; }
+    #toolbar button {
+      padding: 4px 10px;
+      border: 1px solid #0f3460;
+      border-radius: 4px;
+      background: #1a1a2e;
+      color: #e0e0e0;
+      cursor: pointer;
+      font-size: 12px;
+    }
+    #toolbar button:hover { background: #0f3460; }
+    #toolbar .sep { width: 1px; height: 20px; background: #0f3460; }
+    #event-log {
+      position: fixed;
+      bottom: 0;
+      left: 0;
+      right: 0;
+      max-height: 180px;
+      overflow-y: auto;
+      background: #0d1117;
+      border-top: 1px solid #0f3460;
+      font-family: monospace;
+      font-size: 12px;
+      padding: 6px 10px;
+      z-index: 100;
+    }
+    #event-log .entry { padding: 2px 0; border-bottom: 1px solid #161b22; }
+    #event-log .type { color: #58a6ff; }
+    #event-log .time { color: #6e7681; margin-right: 8px; }
+    #event-log .payload { color: #8b949e; }
+    #flutter-container { flex: 1; min-height: 0; position: relative; }
+  </style>
 </head>
 <body>
-  <!--
-    You can customize the "flutter_bootstrap.js" script.
-    This is useful to provide a custom configuration to the Flutter loader
-    or to give the user feedback during the initialization process.
+  <div id="toolbar">
+    <div class="group">
+      <label>Theme:</label>
+      <button id="btn-light">Light</button>
+      <button id="btn-dark">Dark</button>
+    </div>
+    <div class="sep"></div>
+    <div class="group">
+      <label>Data:</label>
+      <button id="btn-few">Few items</button>
+      <button id="btn-many">Many items</button>
+      <button id="btn-empty">Empty</button>
+    </div>
+    <div class="sep"></div>
+    <div class="group">
+      <button id="btn-push">Push state</button>
+      <button id="btn-clear-log">Clear log</button>
+    </div>
+  </div>
 
-    For more details:
-    * https://docs.flutter.dev/platform-integration/web/initialization
-  -->
+  <div id="flutter-container"></div>
+  <div id="event-log"></div>
+
+  <script>
+    // -----------------------------------------------------------------------
+    // Test data generators
+    // -----------------------------------------------------------------------
+
+    function makeId() {
+      return crypto.randomUUID();
+    }
+
+    function iso(year, month, day) {
+      return new Date(year, month - 1, day).toISOString();
+    }
+
+    function buildFewItems() {
+      const g1 = makeId();
+      const g2 = makeId();
+      const g3 = makeId();
+
+      const items = {};
+      const addItem = (groupId, title, start, end, lane, desc) => {
+        const id = makeId();
+        items[id] = {
+          id, groupId, title, description: desc ?? null,
+          start, end: end ?? null, lane,
+        };
+      };
+
+      // Work group
+      addItem(g1, "Project Alpha",    iso(2026, 1, 5),  iso(2026, 3, 15), 1, "Main project");
+      addItem(g1, "Project Beta",     iso(2026, 2, 10), iso(2026, 5, 20), 2, "Secondary project");
+      addItem(g1, "Code Review",      iso(2026, 3, 1),  iso(2026, 3, 5),  1);
+      addItem(g1, "Sprint Planning",  iso(2026, 1, 15), null,             3); // point event
+
+      // Personal group
+      addItem(g2, "Vacation",         iso(2026, 4, 1),  iso(2026, 4, 14), 1, "Spring break");
+      addItem(g2, "Birthday",         iso(2026, 6, 12), null,             1); // point event
+      addItem(g2, "Move apartments",  iso(2026, 3, 20), iso(2026, 3, 25), 2);
+
+      // Learning group
+      addItem(g3, "Flutter course",   iso(2026, 1, 1),  iso(2026, 2, 28), 1);
+      addItem(g3, "Rust book",        iso(2026, 2, 15), iso(2026, 4, 30), 2);
+      addItem(g3, "Conference talk",  iso(2026, 5, 10), null,             1); // point event
+
+      return {
+        timeline: { id: makeId(), title: "My Timeline" },
+        groups: {
+          [g1]: { id: g1, title: "Work",     sortOrder: 0 },
+          [g2]: { id: g2, title: "Personal", sortOrder: 1 },
+          [g3]: { id: g3, title: "Learning", sortOrder: 2 },
+        },
+        items,
+        groupOrder: [g1, g2, g3],
+        selectedItemId: null,
+        darkMode: true,
+      };
+    }
+
+    function buildManyItems() {
+      const groupCount = 5;
+      const groupIds = Array.from({ length: groupCount }, makeId);
+      const groupNames = ["Engineering", "Design", "Marketing", "Operations", "Research"];
+      const groups = {};
+      for (let i = 0; i < groupCount; i++) {
+        groups[groupIds[i]] = { id: groupIds[i], title: groupNames[i], sortOrder: i };
+      }
+
+      const items = {};
+      const baseDate = new Date(2026, 0, 1);
+      let itemIndex = 0;
+      for (const gId of groupIds) {
+        for (let lane = 1; lane <= 3; lane++) {
+          for (let j = 0; j < 4; j++) {
+            const id = makeId();
+            const startOffset = j * 45 + lane * 5 + Math.floor(Math.random() * 10);
+            const duration = 14 + Math.floor(Math.random() * 30);
+            const start = new Date(baseDate);
+            start.setDate(start.getDate() + startOffset);
+            const end = new Date(start);
+            end.setDate(end.getDate() + duration);
+            const isPoint = Math.random() < 0.15;
+            items[id] = {
+              id, groupId: gId,
+              title: `Task ${++itemIndex}`,
+              description: null,
+              start: start.toISOString(),
+              end: isPoint ? null : end.toISOString(),
+              lane,
+            };
+          }
+        }
+      }
+
+      return {
+        timeline: { id: makeId(), title: "Large Timeline" },
+        groups, items,
+        groupOrder: groupIds,
+        selectedItemId: null,
+        darkMode: true,
+      };
+    }
+
+    function buildEmpty() {
+      const g1 = makeId();
+      return {
+        timeline: { id: makeId(), title: "Empty Timeline" },
+        groups: { [g1]: { id: g1, title: "Untitled Group", sortOrder: 0 } },
+        items: {},
+        groupOrder: [g1],
+        selectedItemId: null,
+        darkMode: true,
+      };
+    }
+
+    // -----------------------------------------------------------------------
+    // Bridge state
+    // -----------------------------------------------------------------------
+
+    let currentState = buildFewItems();
+    let updateStateCallback = null;
+
+    window.__zendegi__ = {
+      getState: () => JSON.stringify(currentState),
+      onEvent: (json) => {
+        const event = JSON.parse(json);
+        logEvent(event);
+        handleEvent(event);
+      },
+      set updateState(cb) { updateStateCallback = cb; },
+      get updateState() { return updateStateCallback; },
+    };
+
+    function pushState(state) {
+      currentState = state;
+      if (updateStateCallback) {
+        updateStateCallback(JSON.stringify(state));
+      }
+    }
+
+    // -----------------------------------------------------------------------
+    // Event handling
+    // -----------------------------------------------------------------------
+
+    function handleEvent(event) {
+      switch (event.type) {
+        case "content_height":
+          // No-op in dev page — flex layout handles sizing.
+          // The event is still logged via logEvent().
+          break;
+        case "entry_moved": {
+          const { entryId, newStart, newEnd, newGroupId, newLane } = event.payload;
+          const item = currentState.items[entryId];
+          if (item) {
+            currentState.items[entryId] = {
+              ...item,
+              start: newStart,
+              end: newEnd,
+              groupId: newGroupId,
+              lane: newLane,
+            };
+          }
+          break;
+        }
+        case "entry_resized": {
+          const { entryId, newStart, newEnd, groupId, lane } = event.payload;
+          const item = currentState.items[entryId];
+          if (item) {
+            currentState.items[entryId] = {
+              ...item,
+              start: newStart,
+              end: newEnd,
+              groupId: groupId,
+              lane: lane,
+            };
+          }
+          break;
+        }
+        case "item_selected":
+          currentState.selectedItemId = event.payload.itemId;
+          pushState(currentState);
+          break;
+        case "item_deselected":
+          currentState.selectedItemId = null;
+          pushState(currentState);
+          break;
+      }
+    }
+
+    // -----------------------------------------------------------------------
+    // Event log
+    // -----------------------------------------------------------------------
+
+    function logEvent(event) {
+      const log = document.getElementById("event-log");
+      const entry = document.createElement("div");
+      entry.className = "entry";
+      const now = new Date().toLocaleTimeString("en-GB", { hour12: false });
+      const payloadStr = event.payload ? " " + JSON.stringify(event.payload) : "";
+      entry.innerHTML =
+        `<span class="time">${now}</span>` +
+        `<span class="type">${event.type}</span>` +
+        `<span class="payload">${payloadStr}</span>`;
+      log.appendChild(entry);
+      log.scrollTop = log.scrollHeight;
+    }
+
+    // -----------------------------------------------------------------------
+    // Toolbar actions
+    // -----------------------------------------------------------------------
+
+    function setPageTheme(isDark) {
+      const body = document.body;
+      const toolbar = document.getElementById("toolbar");
+      const eventLog = document.getElementById("event-log");
+
+      if (isDark) {
+        body.style.background = "#1a1a2e";
+        body.style.color = "#e0e0e0";
+        toolbar.style.background = "#16213e";
+        toolbar.style.borderBottomColor = "#0f3460";
+        eventLog.style.background = "#0d1117";
+        eventLog.style.borderTopColor = "#0f3460";
+        for (const btn of toolbar.querySelectorAll("button")) {
+          btn.style.background = "#1a1a2e";
+          btn.style.color = "#e0e0e0";
+          btn.style.borderColor = "#0f3460";
+        }
+        for (const sep of toolbar.querySelectorAll(".sep")) {
+          sep.style.background = "#0f3460";
+        }
+        for (const lbl of toolbar.querySelectorAll("label")) {
+          lbl.style.color = "#8899aa";
+        }
+      } else {
+        body.style.background = "#f0f0f0";
+        body.style.color = "#333";
+        toolbar.style.background = "#e0e0e0";
+        toolbar.style.borderBottomColor = "#ccc";
+        eventLog.style.background = "#f5f5f5";
+        eventLog.style.borderTopColor = "#ccc";
+        for (const btn of toolbar.querySelectorAll("button")) {
+          btn.style.background = "#fff";
+          btn.style.color = "#333";
+          btn.style.borderColor = "#ccc";
+        }
+        for (const sep of toolbar.querySelectorAll(".sep")) {
+          sep.style.background = "#ccc";
+        }
+        for (const lbl of toolbar.querySelectorAll("label")) {
+          lbl.style.color = "#666";
+        }
+      }
+    }
+
+    document.getElementById("btn-dark").addEventListener("click", () => {
+      currentState.darkMode = true;
+      setPageTheme(true);
+      pushState(currentState);
+    });
+
+    document.getElementById("btn-light").addEventListener("click", () => {
+      currentState.darkMode = false;
+      setPageTheme(false);
+      pushState(currentState);
+    });
+
+    document.getElementById("btn-few").addEventListener("click", () => {
+      const state = buildFewItems();
+      state.darkMode = currentState.darkMode;
+      pushState(state);
+    });
+
+    document.getElementById("btn-many").addEventListener("click", () => {
+      const state = buildManyItems();
+      state.darkMode = currentState.darkMode;
+      pushState(state);
+    });
+
+    document.getElementById("btn-empty").addEventListener("click", () => {
+      const state = buildEmpty();
+      state.darkMode = currentState.darkMode;
+      pushState(state);
+    });
+
+    document.getElementById("btn-push").addEventListener("click", () => {
+      pushState(currentState);
+    });
+
+    document.getElementById("btn-clear-log").addEventListener("click", () => {
+      document.getElementById("event-log").innerHTML = "";
+    });
+  </script>
+
+  <script>
+    // Intercept Flutter bootstrap to render into #flutter-container
+    window._flutter = {};
+    let _loaderInstance = null;
+    Object.defineProperty(window._flutter, 'loader', {
+      set(loader) {
+        const origLoad = loader.load.bind(loader);
+        loader.load = (opts = {}) => origLoad({
+          ...opts,
+          onEntrypointLoaded: async (engineInitializer) => {
+            const appRunner = await engineInitializer.initializeEngine({
+              hostElement: document.getElementById('flutter-container'),
+            });
+            appRunner.runApp();
+          },
+        });
+        _loaderInstance = loader;
+      },
+      get() { return _loaderInstance; },
+      configurable: true,
+    });
+  </script>
   <script src="flutter_bootstrap.js" async></script>
 </body>
 </html>