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/response-cache/web.d.ts

@@ -0,0 +1,20 @@
+import type { ResponseCacheEntry, ResponseGenerator } from './types';
+/**
+ * In the web server, there is currently no incremental cache provided and we
+ * always SSR the page.
+ */
+export default class WebResponseCache {
+    pendingResponses: Map<string, Promise<ResponseCacheEntry | null>>;
+    previousCacheItem?: {
+        key: string;
+        entry: ResponseCacheEntry | null;
+        expiresAt: number;
+    };
+    minimalMode?: boolean;
+    constructor(minimalMode: boolean);
+    get(key: string | null, responseGenerator: ResponseGenerator, context: {
+        isOnDemandRevalidate?: boolean;
+        isPrefetch?: boolean;
+        incrementalCache: any;
+    }): Promise<ResponseCacheEntry | null>;
+}