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/lib/util/style.js

@@ -0,0 +1,40 @@
+'use strict';
+
+const c = require('kleur');
+const figures = require('./figures');
+
+// rendering user input.
+const styles = Object.freeze({
+  password: { scale: 1, render: input => '*'.repeat(input.length) },
+  emoji: { scale: 2, render: input => '😃'.repeat(input.length) },
+  invisible: { scale: 0, render: input => '' },
+  default: { scale: 1, render: input => `${input}` }
+});
+const render = type => styles[type] || styles.default;
+
+// icon to signalize a prompt.
+const symbols = Object.freeze({
+  aborted: c.red(figures.cross),
+  done: c.green(figures.tick),
+  exited: c.yellow(figures.cross),
+  default: c.cyan('?')
+});
+
+const symbol = (done, aborted, exited) =>
+  aborted ? symbols.aborted : exited ? symbols.exited : done ? symbols.done : symbols.default;
+
+// between the question and the user's input.
+const delimiter = completing =>
+  c.gray(completing ? figures.ellipsis : figures.pointerSmall);
+
+const item = (expandable, expanded) =>
+  c.gray(expandable ? (expanded ? figures.pointerSmall : '+') : figures.line);
+
+module.exports = {
+  styles,
+  render,
+  symbols,
+  symbol,
+  delimiter,
+  item
+};