refactor(ext/popup): update import paths after generator-popover → generator-panel rename

Update all import statements to reference the new generator-panel module name.
- generator-panel.test.ts: update internal import
- settings-vault.test.ts: update mock import
- settings-vault.ts: update import
- types/login.ts: update import

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

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

@@ -28,7 +28,7 @@ vi.mock('../../popup', async () => {
   return { navigate, setState, sendMessage, getState, escapeHtml };
 });
 
-vi.mock('../generator-popover', () => ({
+vi.mock('../generator-panel', () => ({
   openGeneratorPopover: vi.fn(),
   closeGeneratorPopover: vi.fn(),
 }));