Add side panels, task selection, graph animation, and project docs

- Foldable left panel (user profile) and right panel (task details)
- Clicking a task in the list or graph node selects it and shows details
- Both views (task list + graph) always mounted via absolute inset-0 for
  correct canvas dimensions; tabs toggle visibility with opacity
- Graph node selection animation: other nodes repel outward (charge -600),
  then selected node smoothly slides to center (500ms cubic ease-out),
  then charge restores to -120 and graph stabilizes
- Graph re-fits on tab switch and panel resize via ResizeObserver
- Fix UUID string IDs throughout (backend returns UUIDs, not integers)
- Add TaskDetailPanel, UserPanel components
- Add CLAUDE.md project documentation

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/node_modules/next/dist/client/components/router-reducer/fetch-server-response.d.ts

@@ -0,0 +1,12 @@
+import type { FlightRouterState, FlightData } from '../../../server/app-render/types';
+import { PrefetchKind } from './router-reducer-types';
+export type FetchServerResponseResult = [
+    flightData: FlightData,
+    canonicalUrlOverride: URL | undefined,
+    postponed?: boolean,
+    intercepted?: boolean
+];
+/**
+ * Fetch the flight data for the provided url. Takes in the current router state to decide what to render server-side.
+ */
+export declare function fetchServerResponse(url: URL, flightRouterState: FlightRouterState, nextUrl: string | null, currentBuildId: string, prefetchKind?: PrefetchKind): Promise<FetchServerResponseResult>;