feat(app): 完善播放协议搜索与空状态

test/mine/settings_page_test.dart

@@ -59,7 +59,8 @@ void main() {
     final title = tester.widget<Text>(find.byKey(const Key('subpage-title')));
     expect(title.style?.fontSize, 18);
     expect(title.style?.fontWeight, FontWeight.w800);
-    expect(find.byKey(const Key('settings-notices')), findsOneWidget);
+    expect(find.byKey(const Key('settings-notices')), findsNothing);
+    expect(find.byKey(const Key('mine-account-card')), findsNothing);
     expect(find.byKey(const Key('server-endpoint-setting')), findsNothing);
     expect(find.text('Server address'), findsNothing);
     expect(find.text('English'), findsNothing);