test(harmonyos): pin gesture-viewport invalidation hooks

Assert that backHarmony, homeHarmony, and appSwitcherHarmony call
invalidateHarmonyGestureViewport, and that openHarmonyApp/closeHarmonyApp
do so on their success paths, so deleting the hook call sites can no
longer leave the suite green.

Author: thymikee

src/platforms/harmonyos/__tests__/app-lifecycle.test.ts

@@ -7,6 +7,15 @@ vi.mock('../../../utils/exec.ts', async (importOriginal) => {
   return { ...actual, runCmd: vi.fn() };
 });
 
+const { invalidateHarmonyGestureViewport } = vi.hoisted(() => ({
+  invalidateHarmonyGestureViewport: vi.fn(),
+}));
+
+vi.mock('../snapshot.ts', async (importOriginal) => ({
+  ...(await importOriginal<typeof import('../snapshot.ts')>()),
+  invalidateHarmonyGestureViewport,
+}));
+
 import {
   closeHarmonyApp,
   listHarmonyApps,
@@ -32,6 +41,7 @@ const DEVICE = {
 beforeEach(() => {
   vi.useRealTimers();
   mockRunCmd.mockReset();
+  invalidateHarmonyGestureViewport.mockReset();
 });
 
 afterEach(() => {
@@ -146,6 +156,7 @@ test('HarmonyOS lifecycle commands use HDC bundle and ability primitives', async
       ['-t', 'harmony-1', 'shell', 'aa', 'force-stop', 'com.example.application'],
     ],
   );
+  assert.deepEqual(invalidateHarmonyGestureViewport.mock.calls, [[DEVICE], [DEVICE]]);
 });
 
 test('HarmonyOS app listing filters user-installed bundles through Bundle Manager metadata', async () => {

src/platforms/harmonyos/__tests__/input-actions.test.ts

@@ -75,6 +75,7 @@ test('HarmonyOS input primitives use the documented uiInput command names', asyn
     ],
   );
   assert.deepEqual(sleep.mock.calls, [[25], [50]]);
+  assert.deepEqual(invalidateHarmonyGestureViewport.mock.calls, [[DEVICE], [DEVICE], [DEVICE]]);
 });
 
 test('HarmonyOS scroll derives a viewport-aware swipe plan', async () => {