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/next/dist/build/jest/jest.d.ts

@@ -0,0 +1,24 @@
+import type { Config } from '@jest/types';
+/**
+ * @example
+ * ```ts
+ * // Usage in jest.config.js
+ * const nextJest = require('next/jest');
+ *
+ * // Optionally provide path to Next.js app which will enable loading next.config.js and .env files
+ * const createJestConfig = nextJest({ dir })
+ *
+ * // Any custom config you want to pass to Jest
+ * const customJestConfig = {
+ *     setupFilesAfterEnv: ['<rootDir>/jest.setup.js'],
+ * }
+ *
+ * // createJestConfig is exported in this way to ensure that next/jest can load the Next.js config which is async
+ * module.exports = createJestConfig(customJestConfig)
+ * ```
+ *
+ * Read more: [Next.js Docs: Setting up Jest with Next.js](https://nextjs.org/docs/app/building-your-application/testing/jest)
+ */
+export default function nextJest(options?: {
+    dir?: string;
+}): (customJestConfig?: Config.InitialProjectOptions | (() => Promise<Config.InitialProjectOptions>)) => () => Promise<Config.InitialProjectOptions>;