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/prepareDocument.js

@@ -0,0 +1,56 @@
+import { dispatchDOMEvent } from '../event/dispatchEvent.js';
+import { isElementType } from '../utils/misc/isElementType.js';
+import '../utils/dataTransfer/Clipboard.js';
+import { getInitialValue, clearInitialValue } from './UI.js';
+import '@testing-library/dom';
+import { prepareValueInterceptor, prepareSelectionInterceptor, prepareRangeTextInterceptor } from './interceptor.js';
+
+const isPrepared = Symbol('Node prepared with document state workarounds');
+function prepareDocument(document) {
+    if (document[isPrepared]) {
+        return;
+    }
+    document.addEventListener('focus', (e)=>{
+        const el = e.target;
+        prepareElement(el);
+    }, {
+        capture: true,
+        passive: true
+    });
+    // Our test environment defaults to `document.body` as `activeElement`.
+    // In other environments this might be `null` when preparing.
+    // istanbul ignore else
+    if (document.activeElement) {
+        prepareElement(document.activeElement);
+    }
+    document.addEventListener('blur', (e)=>{
+        const el = e.target;
+        const initialValue = getInitialValue(el);
+        if (initialValue !== undefined) {
+            if (el.value !== initialValue) {
+                dispatchDOMEvent(el, 'change');
+            }
+            clearInitialValue(el);
+        }
+    }, {
+        capture: true,
+        passive: true
+    });
+    document[isPrepared] = isPrepared;
+}
+function prepareElement(el) {
+    if (el[isPrepared]) {
+        return;
+    }
+    if (isElementType(el, [
+        'input',
+        'textarea'
+    ])) {
+        prepareValueInterceptor(el);
+        prepareSelectionInterceptor(el);
+        prepareRangeTextInterceptor(el);
+    }
+    el[isPrepared] = isPrepared;
+}
+
+export { prepareDocument };