fix(linux): Can't change Chinese IMEs on Debian (#582)

Co-authored-by: Cursor Agent <cursoragent@cursor.com>
Co-authored-by: Haze <hazeone@users.noreply.github.com>

tests/unit/title-bar.test.tsx

@@ -0,0 +1,50 @@
+import { beforeEach, describe, expect, it, vi } from 'vitest';
+import { render, screen, waitFor } from '@testing-library/react';
+import { TitleBar } from '@/components/layout/TitleBar';
+
+const invokeIpcMock = vi.hoisted(() => vi.fn());
+
+vi.mock('@/lib/api-client', () => ({
+  invokeIpc: (...args: unknown[]) => invokeIpcMock(...args),
+}));
+
+describe('TitleBar platform behavior', () => {
+  beforeEach(() => {
+    invokeIpcMock.mockReset();
+    invokeIpcMock.mockResolvedValue(false);
+  });
+
+  it('renders macOS drag region', () => {
+    window.electron.platform = 'darwin';
+
+    const { container } = render(<TitleBar />);
+
+    expect(container.querySelector('.drag-region')).toBeInTheDocument();
+    expect(screen.queryByTitle('Minimize')).not.toBeInTheDocument();
+    expect(invokeIpcMock).not.toHaveBeenCalled();
+  });
+
+  it('renders custom controls on Windows', async () => {
+    window.electron.platform = 'win32';
+
+    render(<TitleBar />);
+
+    expect(screen.getByTitle('Minimize')).toBeInTheDocument();
+    expect(screen.getByTitle('Maximize')).toBeInTheDocument();
+    expect(screen.getByTitle('Close')).toBeInTheDocument();
+
+    await waitFor(() => {
+      expect(invokeIpcMock).toHaveBeenCalledWith('window:isMaximized');
+    });
+  });
+
+  it('renders no custom title bar on Linux', () => {
+    window.electron.platform = 'linux';
+
+    const { container } = render(<TitleBar />);
+
+    expect(container.firstChild).toBeNull();
+    expect(screen.queryByTitle('Minimize')).not.toBeInTheDocument();
+    expect(invokeIpcMock).not.toHaveBeenCalled();
+  });
+});