支持录制中切换广角/主摄

test/features/recording/view_model_recording_test.dart

@@ -226,7 +226,33 @@ void main() {
 
         final session = container.read(recordingViewModelProvider).session;
         expect(session.zoomRatio, 1.0);
-        expect(session.errorMessage, 'Zoom is unavailable');
+        expect(session.errorMessage, '切换镜头失败，请重试');
+      },
+    );
+
+    test(
+      'maps native zoom failure to user friendly lens switch message',
+      () async {
+        TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger
+            .setMockMethodCallHandler(
+              const MethodChannel(RecordingChannelNames.method),
+              (call) async {
+                throw PlatformException(
+                  code: 'ZOOM_FAILED',
+                  message: 'Cannot switch physical camera while recording',
+                );
+              },
+            );
+        final container = ProviderContainer();
+        addTearDown(container.dispose);
+
+        await container
+            .read(recordingViewModelProvider.notifier)
+            .setZoomRatio(0.6);
+
+        final session = container.read(recordingViewModelProvider).session;
+        expect(session.zoomRatio, 1.0);
+        expect(session.errorMessage, '切换镜头失败，请重试');
       },
     );
   });

test/features/recording/widget_recording_hud_test.dart

@@ -75,9 +75,7 @@ void main() {
     expect(find.text('1x'), findsOneWidget);
   });
 
-  testWidgets('marks current 0.5x zoom ratio as selected', (
-    tester,
-  ) async {
+  testWidgets('marks current 0.5x zoom ratio as selected', (tester) async {
     await pumpHud(tester, zoomRatio: 0.5, minZoomRatio: 0.5);
 
     final selectedButton = tester.widget<TextButton>(
@@ -135,8 +133,16 @@ void main() {
     expect(selected, 0.6);
   });
 
-  testWidgets('disables 0.6x while recording on main camera', (tester) async {
-    await pumpHud(tester, minZoomRatio: 0.6, isRecording: true);
+  testWidgets('allows 0.6x while recording on main camera after unlock', (
+    tester,
+  ) async {
+    double? selected;
+    await pumpHud(
+      tester,
+      minZoomRatio: 0.6,
+      isRecording: true,
+      onZoomSelected: (ratio) => selected = ratio,
+    );
 
     final ultraWideButton = tester.widget<TextButton>(
       find.ancestor(of: find.text('0.6x'), matching: find.byType(TextButton)),
@@ -145,14 +151,26 @@ void main() {
       find.ancestor(of: find.text('1x'), matching: find.byType(TextButton)),
     );
 
-    expect(ultraWideButton.enabled, isFalse);
+    expect(ultraWideButton.enabled, isTrue);
     expect(mainButton.enabled, isFalse);
+
+    await tester.tap(find.text('0.6x'));
+    await tester.pump();
+
+    expect(selected, 0.6);
   });
 
-  testWidgets('disables main zoom presets while recording on ultra-wide', (
+  testWidgets('allows 1x while recording on ultra-wide after unlock', (
     tester,
   ) async {
-    await pumpHud(tester, zoomRatio: 0.5, minZoomRatio: 0.5, isRecording: true);
+    double? selected;
+    await pumpHud(
+      tester,
+      zoomRatio: 0.5,
+      minZoomRatio: 0.5,
+      isRecording: true,
+      onZoomSelected: (ratio) => selected = ratio,
+    );
 
     final ultraWideButton = tester.widget<TextButton>(
       find.ancestor(of: find.text('0.5x'), matching: find.byType(TextButton)),
@@ -162,6 +180,11 @@ void main() {
     );
 
     expect(ultraWideButton.enabled, isFalse);
-    expect(mainButton.enabled, isFalse);
+    expect(mainButton.enabled, isTrue);
+
+    await tester.tap(find.text('1x'));
+    await tester.pump();
+
+    expect(selected, 1.0);
   });
 }