feat: import Chinese-localized Buzz source snapshot

Signed-off-by: cls_宁波本机 <908705107@qq.com>

mobile/test/shared/widgets/buzz_loading_indicator_test.dart

@@ -0,0 +1,50 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:hooks_riverpod/hooks_riverpod.dart';
+import 'package:buzz/shared/theme/theme.dart';
+import 'package:buzz/shared/widgets/buzz_loading_indicator.dart';
+
+Widget _testable({required bool disableAnimations}) {
+  return ProviderScope(
+    child: MaterialApp(
+      theme: AppTheme.light(),
+      home: MediaQuery(
+        data: const MediaQueryData().copyWith(
+          disableAnimations: disableAnimations,
+        ),
+        child: const Scaffold(
+          body: BuzzLoadingIndicator(semanticLabel: 'Loading photos'),
+        ),
+      ),
+    ),
+  );
+}
+
+void main() {
+  testWidgets('animates the shared arc spinner', (tester) async {
+    final semantics = tester.ensureSemantics();
+
+    await tester.pumpWidget(_testable(disableAnimations: false));
+    await tester.pump(const Duration(milliseconds: 70));
+
+    final spinner = tester.widget<RotationTransition>(
+      find.byKey(const ValueKey('buzz-loading-indicator-spinner')),
+    );
+    expect(spinner.turns.value, greaterThan(0));
+    expect(find.bySemanticsLabel('Loading photos'), findsOneWidget);
+    semantics.dispose();
+  });
+
+  testWidgets('holds a static pose when reduced motion is enabled', (
+    tester,
+  ) async {
+    await tester.pumpWidget(_testable(disableAnimations: true));
+    await tester.pump(const Duration(milliseconds: 70));
+
+    final spinner = tester.widget<RotationTransition>(
+      find.byKey(const ValueKey('buzz-loading-indicator-spinner')),
+    );
+    expect(spinner.turns.value, 0);
+    expect(tester.binding.hasScheduledFrame, isFalse);
+  });
+}