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/esm/client/request-idle-callback.js

@@ -0,0 +1,16 @@
+export const requestIdleCallback = typeof self !== "undefined" && self.requestIdleCallback && self.requestIdleCallback.bind(window) || function(cb) {
+    let start = Date.now();
+    return self.setTimeout(function() {
+        cb({
+            didTimeout: false,
+            timeRemaining: function() {
+                return Math.max(0, 50 - (Date.now() - start));
+            }
+        });
+    }, 1);
+};
+export const cancelIdleCallback = typeof self !== "undefined" && self.cancelIdleCallback && self.cancelIdleCallback.bind(window) || function(id) {
+    return clearTimeout(id);
+};
+
+//# sourceMappingURL=request-idle-callback.js.map