fix(home): 修复样式常量与测试类型错误

test/following/following_page_test.dart

@@ -79,9 +79,11 @@ void main() {
       coverClip.borderRadius,
       BorderRadius.circular(AppDimens.cardCoverRadius),
     );
-    final title = tester.widget<Text>(
-      find.descendant(of: card, matching: find.text('The Signal')),
+    final titleFinder = find.descendant(
+      of: card,
+      matching: find.text('The Signal'),
     );
+    final title = tester.widget<Text>(titleFinder);
     expect(title.style?.fontSize, AppDimens.cardTitleFont);
     expect(title.style?.fontWeight, FontWeight.w500);
     expect(title.style?.height, AppDimens.cardTitleLineHeight);
@@ -105,14 +107,15 @@ void main() {
       ),
       findsOneWidget,
     );
-    final tags = tester.widget<Text>(
-      find.byKey(const Key('following-tags-the-signal-demo')),
+    final tagsFinder = find.byKey(
+      const Key('following-tags-the-signal-demo'),
     );
+    final tags = tester.widget<Text>(tagsFinder);
     expect(tags.data, 'Suspense | Mystery');
     expect(tags.style?.fontSize, AppDimens.cardTagFont);
     expect(tags.style?.color, AppColors.textTertiary);
-    expect(tester.getTopLeft(title).dx, tester.getTopLeft(coverFinder).dx);
-    expect(tester.getTopLeft(tags).dx, tester.getTopLeft(cover).dx);
+    expect(tester.getTopLeft(titleFinder).dx, tester.getTopLeft(coverFinder).dx);
+    expect(tester.getTopLeft(tagsFinder).dx, tester.getTopLeft(coverFinder).dx);
 
     await tester.tap(find.byKey(const Key('following-edit')));
     await tester.pumpAndSettle();