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/@testing-library/user-event/dist/esm/utility/clear.js

@@ -0,0 +1,30 @@
+import '../event/behavior/click.js';
+import '../event/behavior/cut.js';
+import '../event/behavior/keydown.js';
+import '../event/behavior/keypress.js';
+import '../event/behavior/keyup.js';
+import '../event/behavior/paste.js';
+import '@testing-library/dom';
+import '../utils/dataTransfer/Clipboard.js';
+import { isEditable } from '../utils/edit/isEditable.js';
+import { isDisabled } from '../utils/misc/isDisabled.js';
+import { focusElement } from '../event/focus.js';
+import { input } from '../event/input.js';
+import { selectAll, isAllSelected } from '../event/selection/selectAll.js';
+
+async function clear(element) {
+    if (!isEditable(element) || isDisabled(element)) {
+        throw new Error('clear()` is only supported on editable elements.');
+    }
+    focusElement(element);
+    if (element.ownerDocument.activeElement !== element) {
+        throw new Error('The element to be cleared could not be focused.');
+    }
+    selectAll(element);
+    if (!isAllSelected(element)) {
+        throw new Error('The element content to be cleared could not be selected.');
+    }
+    input(this, element, '', 'deleteContentBackward');
+}
+
+export { clear };