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/@nodelib/fs.stat/out/adapters/fs.d.ts

@@ -0,0 +1,13 @@
+/// <reference types="node" />
+import * as fs from 'fs';
+import type { ErrnoException } from '../types';
+export declare type StatAsynchronousMethod = (path: string, callback: (error: ErrnoException | null, stats: fs.Stats) => void) => void;
+export declare type StatSynchronousMethod = (path: string) => fs.Stats;
+export interface FileSystemAdapter {
+    lstat: StatAsynchronousMethod;
+    stat: StatAsynchronousMethod;
+    lstatSync: StatSynchronousMethod;
+    statSync: StatSynchronousMethod;
+}
+export declare const FILE_SYSTEM_ADAPTER: FileSystemAdapter;
+export declare function createFileSystemAdapter(fsMethods?: Partial<FileSystemAdapter>): FileSystemAdapter;

frontend/node_modules/@nodelib/fs.stat/out/adapters/fs.js

@@ -0,0 +1,17 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.createFileSystemAdapter = exports.FILE_SYSTEM_ADAPTER = void 0;
+const fs = require("fs");
+exports.FILE_SYSTEM_ADAPTER = {
+    lstat: fs.lstat,
+    stat: fs.stat,
+    lstatSync: fs.lstatSync,
+    statSync: fs.statSync
+};
+function createFileSystemAdapter(fsMethods) {
+    if (fsMethods === undefined) {
+        return exports.FILE_SYSTEM_ADAPTER;
+    }
+    return Object.assign(Object.assign({}, exports.FILE_SYSTEM_ADAPTER), fsMethods);
+}
+exports.createFileSystemAdapter = createFileSystemAdapter;