FN-6323: mock mobile keyboard viewport lock in App tests

Keep the App test suite aligned with the mobile scroll lock hook exports.\n\n- Add a vi.fn() mock for useMobileKeyboardViewportLock in the existing useMobileScrollLock module mock.\n- Preserve the iOS and lock-state mocks used by App test coverage.\n\nFiles changed:\n packages/dashboard/app/components/__tests__/App.test.tsx | 1 +\n 1 file changed, 1 insertion(+)

Fusion-Task-Id: FN-6323

Fusion-Task-Lineage: cc257afe-2ab7-4e97-b04f-2ccae28eaf38

packages/dashboard/app/components/__tests__/App.test.tsx

@@ -590,6 +590,7 @@ vi.mock("../../hooks/useViewportMode", () => ({
 // Mock isIOS so FN-3290 keyboard-open behavior is testable in jsdom
 vi.mock("../../hooks/useMobileScrollLock", () => ({
   useMobileScrollLock: vi.fn(),
+  useMobileKeyboardViewportLock: vi.fn(),
   isIOS: () => true,
   _resetLockState: vi.fn(),
 }));