feat(ext/popup): ⚙ picker → device/vault settings

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

extension/src/popup/popup.ts

@@ -10,6 +10,7 @@ import { renderItemList } from './components/item-list';
 import { renderItemDetail } from './components/item-detail';
 import { renderItemForm } from './components/item-form';
 import { renderSettings } from './components/settings';
+import { renderVaultSettings } from './components/settings-vault';
 
 // --- Escape HTML to prevent XSS ---
 export function escapeHtml(str: string): string {
@@ -146,6 +147,9 @@ function render(): void {
     case 'settings':
       renderSettings(app);
       break;
+    case 'settings-vault':
+      renderVaultSettings(app);
+      break;
   }
 }