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/prompts/dist/util/figures.js

@@ -0,0 +1,32 @@
+'use strict';
+
+const main = {
+  arrowUp: '↑',
+  arrowDown: '↓',
+  arrowLeft: '←',
+  arrowRight: '→',
+  radioOn: '◉',
+  radioOff: '◯',
+  tick: '✔',
+  cross: '✖',
+  ellipsis: '…',
+  pointerSmall: '›',
+  line: '─',
+  pointer: '❯'
+};
+const win = {
+  arrowUp: main.arrowUp,
+  arrowDown: main.arrowDown,
+  arrowLeft: main.arrowLeft,
+  arrowRight: main.arrowRight,
+  radioOn: '(*)',
+  radioOff: '( )',
+  tick: '√',
+  cross: '×',
+  ellipsis: '...',
+  pointerSmall: '»',
+  line: '─',
+  pointer: '>'
+};
+const figures = process.platform === 'win32' ? win : main;
+module.exports = figures;