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/babel/preset.d.ts

@@ -0,0 +1,25 @@
+import type { PluginItem } from 'next/dist/compiled/babel/core';
+type StyledJsxPlugin = [string, any] | string;
+type StyledJsxBabelOptions = {
+    plugins?: StyledJsxPlugin[];
+    styleModule?: string;
+    'babel-test'?: boolean;
+} | undefined;
+type NextBabelPresetOptions = {
+    'preset-env'?: any;
+    'preset-react'?: any;
+    'class-properties'?: any;
+    'transform-runtime'?: any;
+    'styled-jsx'?: StyledJsxBabelOptions;
+    'preset-typescript'?: any;
+};
+type BabelPreset = {
+    presets?: PluginItem[] | null;
+    plugins?: PluginItem[] | null;
+    sourceType?: 'script' | 'module' | 'unambiguous';
+    overrides?: Array<{
+        test: RegExp;
+    } & Omit<BabelPreset, 'overrides'>>;
+};
+declare const _default: (api: any, options?: NextBabelPresetOptions) => BabelPreset;
+export default _default;