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/yargs/helpers/helpers.mjs

@@ -0,0 +1,10 @@
+import {applyExtends as _applyExtends} from '../build/lib/utils/apply-extends.js';
+import {hideBin} from '../build/lib/utils/process-argv.js';
+import Parser from 'yargs-parser';
+import shim from '../lib/platform-shims/esm.mjs';
+
+const applyExtends = (config, cwd, mergeExtends) => {
+  return _applyExtends(config, cwd, mergeExtends, shim);
+};
+
+export {applyExtends, hideBin, Parser};