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__/generator-panel.test.ts

@@ -5,7 +5,7 @@ vi.mock('../../popup', async () => {
   return { sendMessage };
 });
 
-import { openGeneratorPopover, closeGeneratorPopover } from '../generator-popover';
+import { openGeneratorPopover, closeGeneratorPopover } from '../generator-panel';
 import { sendMessage } from '../../popup';
 import type { GeneratorRequest } from '../../../shared/types';