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/webpack/loaders/utils.d.ts

@@ -0,0 +1,21 @@
+import type webpack from 'webpack';
+export declare function isClientComponentEntryModule(mod: {
+    resource: string;
+    buildInfo?: any;
+}): any;
+export declare const regexCSS: RegExp;
+export declare function isCSSMod(mod: {
+    resource: string;
+    type?: string;
+    loaders?: {
+        loader: string;
+    }[];
+}): boolean;
+export declare function getActions(mod: {
+    resource: string;
+    buildInfo?: any;
+}): undefined | string[];
+export declare function generateActionId(filePath: string, exportName: string): string;
+export declare function encodeToBase64<T extends {}>(obj: T): string;
+export declare function decodeFromBase64<T extends {}>(str: string): T;
+export declare function getLoaderModuleNamedExports(resourcePath: string, context: webpack.LoaderContext<any>): Promise<string[]>;