fix(ext/popup): update stale generator-popover mock names in settings-vault test

The mock in settings-vault.test.ts referenced the old function names
openGeneratorPopover and closeGeneratorPopover, which were renamed to
openGeneratorPanel and closeGeneratorPanel during the refactor. Update
the mock to use the current function names.

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

extension/src/popup/components/__tests__/settings-vault.test.ts

@@ -29,8 +29,8 @@ vi.mock('../../popup', async () => {
 });
 
 vi.mock('../generator-panel', () => ({
-  openGeneratorPopover: vi.fn(),
-  closeGeneratorPopover: vi.fn(),
+  openGeneratorPanel: vi.fn(),
+  closeGeneratorPanel: vi.fn(),
 }));
 
 import { renderVaultSettings } from '../settings-vault';