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/lazy-dynamic/dynamic-bailout-to-csr.d.ts

@@ -0,0 +1,11 @@
+import type { ReactElement } from 'react';
+interface BailoutToCSRProps {
+    reason: string;
+    children: ReactElement;
+}
+/**
+ * If rendered on the server, this component throws an error
+ * to signal Next.js that it should bail out to client-side rendering instead.
+ */
+export declare function BailoutToCSR({ reason, children }: BailoutToCSRProps): ReactElement<any, string | import("react").JSXElementConstructor<any>>;
+export {};