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/ts-jest/dist/config/paths-to-module-name-mapper.d.ts

@@ -0,0 +1,9 @@
+import type { Config } from '@jest/types';
+import type { CompilerOptions } from 'typescript';
+type TsPathMapping = Exclude<CompilerOptions['paths'], undefined>;
+type JestPathMapping = Config.InitialOptions['moduleNameMapper'];
+export declare const pathsToModuleNameMapper: (mapping: TsPathMapping, { prefix, useESM }?: {
+    prefix?: string;
+    useESM?: boolean;
+}) => JestPathMapping;
+export {};