fix: resolve all failing frontend tests

- Fix vitest.config.ts React alias to point to local node_modules
  instead of nonexistent ancestor path (../../../../node_modules/react)
- Remove stale HQWaitingForInputSection tests (component was deleted
  in e8d332e0 but test cases were left behind)

vitest.config.ts

@@ -5,14 +5,12 @@ import path from 'node:path';
 export default defineConfig({
   plugins: [react()],
   resolve: {
-    // Alias react to the parent monorepo's copy, matching what @testing-library
-    // loads react-dom from. This ensures React DOM and our components share the
-    // same ReactSharedInternals and hook dispatcher — preventing null-dispatcher
-    // errors when running tests from a git worktree.
+    // Ensure all React imports resolve to the same copy, preventing
+    // duplicate-React errors (mismatched ReactSharedInternals / hook dispatcher).
     alias: {
       '@': path.resolve(__dirname, './apps/web/src'),
-      react: path.resolve(__dirname, '../../../../node_modules/react'),
-      'react-dom': path.resolve(__dirname, '../../../../node_modules/react-dom'),
+      react: path.resolve(__dirname, 'node_modules/react'),
+      'react-dom': path.resolve(__dirname, 'node_modules/react-dom'),
     },
     dedupe: ['react', 'react-dom'],
   },