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/.next/build-manifest.json

@@ -0,0 +1,30 @@
+{
+  "polyfillFiles": [
+    "static/chunks/polyfills.js"
+  ],
+  "devFiles": [
+    "static/chunks/react-refresh.js"
+  ],
+  "ampDevFiles": [],
+  "lowPriorityFiles": [
+    "static/development/_buildManifest.js",
+    "static/development/_ssgManifest.js"
+  ],
+  "rootMainFiles": [
+    "static/chunks/webpack.js",
+    "static/chunks/main-app.js"
+  ],
+  "pages": {
+    "/_app": [
+      "static/chunks/webpack.js",
+      "static/chunks/main.js",
+      "static/chunks/pages/_app.js"
+    ],
+    "/_error": [
+      "static/chunks/webpack.js",
+      "static/chunks/main.js",
+      "static/chunks/pages/_error.js"
+    ]
+  },
+  "ampFirstPages": []
+}