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/tmpl/lib/tmpl.js

@@ -0,0 +1,17 @@
+var INTERPOLATE = /{([^{]+?)}/g
+
+module.exports = function(str, data) {
+  var tmpl = 'var __p=[],print=function(){__p.push.apply(__p,arguments);};' +
+    'with(obj||{}){__p.push(\'' +
+    str.replace(/\\/g, '\\\\')
+       .replace(/'/g, "\\'")
+       .replace(INTERPOLATE, function(match, code) {
+         return "'," + code.replace(/\\'/g, "'") + ",'"
+       })
+       .replace(/\r/g, '\\r')
+       .replace(/\n/g, '\\n')
+       .replace(/\t/g, '\\t')
+       + "');}return __p.join('');"
+  var func = new Function('obj', tmpl)
+  return data ? func(data) : func
+}