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/document/trackValue.js

@@ -0,0 +1,53 @@
+import '../utils/dataTransfer/Clipboard.js';
+import { getWindow } from '../utils/misc/getWindow.js';
+import { setUIValueClean, setUISelection, hasUISelection } from './UI.js';
+
+const TrackChanges = Symbol('Track programmatic changes for React workaround');
+// When the input event happens in the browser, React executes all event handlers
+// and if they change state of a controlled value, nothing happens.
+// But when we trigger the event handlers in test environment with React@17,
+// the changes are rolled back before the state update is applied.
+// This results in a reset cursor.
+// There might be a better way to work around if we figure out
+// why the batched update is executed differently in our test environment.
+function isReact17Element(element) {
+    return Object.getOwnPropertyNames(element).some((k)=>k.startsWith('__react')) && getWindow(element).REACT_VERSION === 17;
+}
+function startTrackValue(element) {
+    if (!isReact17Element(element)) {
+        return;
+    }
+    element[TrackChanges] = {
+        previousValue: String(element.value),
+        tracked: []
+    };
+}
+function trackOrSetValue(element, v) {
+    var _element_TrackChanges_tracked, _element_TrackChanges;
+    (_element_TrackChanges = element[TrackChanges]) === null || _element_TrackChanges === undefined ? undefined : (_element_TrackChanges_tracked = _element_TrackChanges.tracked) === null || _element_TrackChanges_tracked === undefined ? undefined : _element_TrackChanges_tracked.push(v);
+    if (!element[TrackChanges]) {
+        setUIValueClean(element);
+        setUISelection(element, {
+            focusOffset: v.length
+        });
+    }
+}
+function commitValueAfterInput(element, cursorOffset) {
+    var _changes_tracked;
+    const changes = element[TrackChanges];
+    element[TrackChanges] = undefined;
+    if (!(changes === null || changes === undefined ? undefined : (_changes_tracked = changes.tracked) === null || _changes_tracked === undefined ? undefined : _changes_tracked.length)) {
+        return;
+    }
+    const isJustReactStateUpdate = changes.tracked.length === 2 && changes.tracked[0] === changes.previousValue && changes.tracked[1] === element.value;
+    if (!isJustReactStateUpdate) {
+        setUIValueClean(element);
+    }
+    if (hasUISelection(element)) {
+        setUISelection(element, {
+            focusOffset: isJustReactStateUpdate ? cursorOffset : element.value.length
+        });
+    }
+}
+
+export { commitValueAfterInput, startTrackValue, trackOrSetValue };