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/lz-string/typings/lz-string.d.ts

@@ -0,0 +1,14 @@
+export function compressToBase64(input: string): string;
+export function decompressFromBase64(input: string): string;
+
+export function compressToUTF16(input: string): string;
+export function decompressFromUTF16(compressed: string): string;
+
+export function compressToUint8Array(uncompressed: string): Uint8Array;
+export function decompressFromUint8Array(compressed: Uint8Array): string;
+
+export function compressToEncodedURIComponent(input: string): string;
+export function decompressFromEncodedURIComponent(compressed: string): string;
+
+export function compress(input: string): string;
+export function decompress(compressed: string): string;