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/server/future/route-matcher-managers/dev-route-matcher-manager.d.ts

@@ -0,0 +1,19 @@
+import { RouteKind } from '../route-kind';
+import type { RouteMatch } from '../route-matches/route-match';
+import type { RouteDefinition } from '../route-definitions/route-definition';
+import { DefaultRouteMatcherManager } from './default-route-matcher-manager';
+import type { MatchOptions, RouteMatcherManager } from './route-matcher-manager';
+import type { RouteMatcher } from '../route-matchers/route-matcher';
+export interface RouteEnsurer {
+    ensure(match: RouteMatch, pathname: string): Promise<void>;
+}
+export declare class DevRouteMatcherManager extends DefaultRouteMatcherManager {
+    private readonly production;
+    private readonly ensurer;
+    private readonly dir;
+    constructor(production: RouteMatcherManager, ensurer: RouteEnsurer, dir: string);
+    test(pathname: string, options: MatchOptions): Promise<boolean>;
+    protected validate(pathname: string, matcher: RouteMatcher, options: MatchOptions): RouteMatch | null;
+    matchAll(pathname: string, options: MatchOptions): AsyncGenerator<RouteMatch<RouteDefinition<RouteKind>>, null, undefined>;
+    reload(): Promise<void>;
+}