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/browserslist/browser.js

@@ -0,0 +1,54 @@
+var BrowserslistError = require('./error')
+
+function noop() {}
+
+module.exports = {
+  loadQueries: function loadQueries() {
+    throw new BrowserslistError(
+      'Sharable configs are not supported in client-side build of Browserslist'
+    )
+  },
+
+  getStat: function getStat(opts) {
+    return opts.stats
+  },
+
+  loadConfig: function loadConfig(opts) {
+    if (opts.config) {
+      throw new BrowserslistError(
+        'Browserslist config are not supported in client-side build'
+      )
+    }
+  },
+
+  loadCountry: function loadCountry() {
+    throw new BrowserslistError(
+      'Country statistics are not supported ' +
+        'in client-side build of Browserslist'
+    )
+  },
+
+  loadFeature: function loadFeature() {
+    throw new BrowserslistError(
+      'Supports queries are not available in client-side build of Browserslist'
+    )
+  },
+
+  currentNode: function currentNode(resolve, context) {
+    return resolve(['maintained node versions'], context)[0]
+  },
+
+  parseConfig: noop,
+
+  readConfig: noop,
+
+  findConfig: noop,
+
+  findConfigFile: noop,
+
+  clearCaches: noop,
+
+  oldDataWarning: noop,
+
+  env: {}
+}