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/build/webpack/plugins/nextjs-require-cache-hot-reloader.d.ts

@@ -0,0 +1,14 @@
+import type { webpack } from 'next/dist/compiled/webpack/webpack';
+type Compiler = webpack.Compiler;
+type WebpackPluginInstance = webpack.WebpackPluginInstance;
+export declare function deleteAppClientCache(): void;
+export declare function deleteCache(filePath: string): void;
+export declare class NextJsRequireCacheHotReloader implements WebpackPluginInstance {
+    prevAssets: any;
+    serverComponents: boolean;
+    constructor(opts: {
+        serverComponents: boolean;
+    });
+    apply(compiler: Compiler): void;
+}
+export {};