feat(renderer): add updater store mirroring main process state

tests/unit/lib/updater-store.test.ts

@@ -0,0 +1,52 @@
+import { describe, expect, test, beforeEach, vi } from 'vitest';
+
+vi.mock('@/lib/ipc', () => ({
+  ipc: {
+    updater: {
+      check: vi.fn(),
+      install: vi.fn(),
+      getState: vi.fn().mockResolvedValue({ state: 'idle' }),
+    },
+  },
+}));
+
+import { useUpdaterStore } from '@/lib/updater-store';
+import { ipc } from '@/lib/ipc';
+
+beforeEach(() => {
+  useUpdaterStore.setState({
+    state: 'idle',
+    version: null,
+    percent: 0,
+    lastCheckAt: 0,
+  });
+  vi.clearAllMocks();
+});
+
+describe('useUpdaterStore', () => {
+  test('initial state is idle', () => {
+    expect(useUpdaterStore.getState().state).toBe('idle');
+  });
+
+  test('applyStatus updates state from incoming event', () => {
+    useUpdaterStore.getState().applyStatus({ state: 'available', version: '5.0.2' });
+    expect(useUpdaterStore.getState().state).toBe('available');
+    expect(useUpdaterStore.getState().version).toBe('5.0.2');
+  });
+
+  test('check() debounces within 60s', async () => {
+    useUpdaterStore.setState({ lastCheckAt: Date.now() });
+    await useUpdaterStore.getState().check();
+    expect(ipc.updater.check).not.toHaveBeenCalled();
+  });
+
+  test('check() invokes ipc.updater.check when not debounced', async () => {
+    await useUpdaterStore.getState().check();
+    expect(ipc.updater.check).toHaveBeenCalled();
+  });
+
+  test('install() invokes ipc.updater.install', () => {
+    useUpdaterStore.getState().install();
+    expect(ipc.updater.install).toHaveBeenCalled();
+  });
+});