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/shared/lib/page-path/absolute-path-to-page.d.ts

@@ -0,0 +1,22 @@
+import type { PAGE_TYPES } from '../../../lib/page-types';
+/**
+ * Given the absolute path to the pages folder, an absolute file path for a
+ * page and the page extensions, this function will return the page path
+ * relative to the pages folder. It doesn't consider index tail. Example:
+ *  - `/Users/rick/my-project/pages/foo/bar/baz.js` -> `/foo/bar/baz`
+ *
+ * It also handles special metadata routes mapping. Example:
+ * - `/Users/rick/my-project/app/sitemap.js` -> `/sitemap/route`
+ *
+ * @param filepath Absolute path to the page.
+ * @param opts.dir Absolute path to the pages/app folder.
+ * @param opts.extensions Extensions allowed for the page.
+ * @param opts.keepIndex When true the trailing `index` kept in the path.
+ * @param opts.pagesType Whether the page is in the pages or app directory.
+ */
+export declare function absolutePathToPage(pagePath: string, options: {
+    extensions: string[] | readonly string[];
+    keepIndex: boolean;
+    dir: string;
+    pagesType: PAGE_TYPES;
+}): string;