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/lib/metadata/get-metadata-route.d.ts

@@ -0,0 +1,18 @@
+/**
+ * Fill the dynamic segment in the metadata route
+ *
+ * Example:
+ * fillMetadataSegment('/a/[slug]', { params: { slug: 'b' } }, 'open-graph') -> '/a/b/open-graph'
+ *
+ */
+export declare function fillMetadataSegment(segment: string, params: any, imageSegment: string): string;
+/**
+ * Map metadata page key to the corresponding route
+ *
+ * static file page key:    /app/robots.txt -> /robots.xml -> /robots.txt/route
+ * dynamic route page key:  /app/robots.tsx -> /robots -> /robots.txt/route
+ *
+ * @param page
+ * @returns
+ */
+export declare function normalizeMetadataRoute(page: string): string;