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/@babel/runtime/helpers/esm/using.js

@@ -0,0 +1,12 @@
+function _using(o, n, e) {
+  if (null == n) return n;
+  if (Object(n) !== n) throw new TypeError("using declarations can only be used with objects, functions, null, or undefined.");
+  if (e) var r = n[Symbol.asyncDispose || Symbol["for"]("Symbol.asyncDispose")];
+  if (null == r && (r = n[Symbol.dispose || Symbol["for"]("Symbol.dispose")]), "function" != typeof r) throw new TypeError("Property [Symbol.dispose] is not a function.");
+  return o.push({
+    v: n,
+    d: r,
+    a: e
+  }), n;
+}
+export { _using as default };