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/tailwindcss/scripts/create-plugin-list.js

@@ -0,0 +1,10 @@
+import { corePlugins } from '../src/corePlugins'
+import fs from 'fs'
+import path from 'path'
+
+let corePluginList = Object.keys(corePlugins)
+
+fs.writeFileSync(
+  path.join(process.cwd(), 'src', 'corePluginList.js'),
+  `export default ${JSON.stringify(corePluginList)}`
+)