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/shared/lib/fnv1a.d.ts

@@ -0,0 +1,13 @@
+declare const FNV_PRIMES: {
+    readonly 32: bigint;
+    readonly 64: bigint;
+    readonly 128: bigint;
+    readonly 256: bigint;
+    readonly 512: bigint;
+    readonly 1024: bigint;
+};
+export default function fnv1a(inputString: string, { size, seed, }?: {
+    size?: keyof typeof FNV_PRIMES;
+    seed?: number;
+}): bigint;
+export {};