fix: add electron mock to teams IPC test for CI compatibility

The test imports teams.ts which transitively requires electron runtime
(via NotificationManager). Add vi.mock('electron') so tests pass in CI
where electron binary is not installed.

test/main/ipc/teams.test.ts

@@ -1,6 +1,11 @@
 import * as os from 'os';
 import { beforeEach, describe, expect, it, vi } from 'vitest';
 
+vi.mock('electron', () => ({
+  app: { getLocale: vi.fn(() => 'en'), getPath: vi.fn(() => '/tmp') },
+  Notification: vi.fn(),
+}));
+
 vi.mock('@preload/constants/ipcChannels', () => ({
   TEAM_LIST: 'team:list',
   TEAM_GET_DATA: 'team:getData',