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/prefetch-cache-utils.d.ts

@@ -0,0 +1,27 @@
+import { type FetchServerResponseResult } from './fetch-server-response';
+import { PrefetchCacheEntryStatus, type PrefetchCacheEntry, PrefetchKind, type ReadonlyReducerState } from './router-reducer-types';
+/**
+ * Returns a prefetch cache entry if one exists. Otherwise creates a new one and enqueues a fetch request
+ * to retrieve the prefetch data from the server.
+ */
+export declare function getOrCreatePrefetchCacheEntry({ url, nextUrl, tree, buildId, prefetchCache, kind, }: Pick<ReadonlyReducerState, 'nextUrl' | 'prefetchCache' | 'tree' | 'buildId'> & {
+    url: URL;
+    kind?: PrefetchKind;
+}): PrefetchCacheEntry;
+/**
+ * Use to seed the prefetch cache with data that has already been fetched.
+ */
+export declare function createPrefetchCacheEntryForInitialLoad({ nextUrl, tree, prefetchCache, url, kind, data, }: Pick<ReadonlyReducerState, 'nextUrl' | 'tree' | 'prefetchCache'> & {
+    url: URL;
+    kind: PrefetchKind;
+    data: FetchServerResponseResult;
+}): {
+    treeAtTimeOfPrefetch: import("../../../server/app-render/types").FlightRouterState;
+    data: Promise<FetchServerResponseResult>;
+    kind: PrefetchKind;
+    prefetchTime: number;
+    lastUsedTime: number;
+    key: string;
+    status: PrefetchCacheEntryStatus;
+};
+export declare function prunePrefetchCache(prefetchCache: ReadonlyReducerState['prefetchCache']): void;