test(mobile): settings smoke test; docs: capture points to blob-upload

- settings.test.tsx mirrors auth/home import smoke pattern
- Capture screen comment: future uploads via api/blob-upload

Made-with: Cursor

mobile/src/app/(tabs)/capture.tsx

@@ -6,6 +6,8 @@ import { useWorkspaceStore, type WorkspaceState } from '../../store/workspace-st
 import { OFFLINE_QUEUE_MAX_RETRIES, OFFLINE_QUEUE_MAX_SIZE } from '../../lib/offline-queue';
 import { colors } from '../../theme';
 
+/** File/image uploads should go through `api/blob-upload` (shared `blobClient`) when implemented. */
+
 export default function CaptureScreen() {
   const [title, setTitle] = useState('');
   const [body, setBody] = useState('');

mobile/src/app/(tabs)/settings.test.tsx

@@ -0,0 +1,36 @@
+import { beforeEach, describe, expect, it, vi } from 'vitest';
+import React, { isValidElement } from 'react';
+
+vi.mock('expo-router', () => ({
+  router: { replace: vi.fn() },
+}));
+
+vi.mock('../../lib/feedback-client', () => ({
+  getFeedbackClient: () => ({
+    submitWithScreenshot: vi.fn().mockResolvedValue(undefined),
+  }),
+}));
+
+vi.mock('../../store/auth-store', () => ({
+  useAuthStore: (selector: (state: { email: string | null; signOut: () => void }) => unknown) =>
+    selector({ email: 'test@example.com', signOut: vi.fn() }),
+}));
+
+import SettingsScreen from './settings';
+
+describe('SettingsScreen', () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+  });
+
+  it('is a valid React component', () => {
+    expect(typeof SettingsScreen).toBe('function');
+    const element = React.createElement(SettingsScreen);
+    expect(isValidElement(element)).toBe(true);
+  });
+
+  it('exports as default', () => {
+    expect(SettingsScreen).toBeDefined();
+    expect(SettingsScreen.name).toBe('SettingsScreen');
+  });
+});