style(empty): 放大空状态图标并降低亮度

test/empty_state/empty_state_test.dart

@@ -23,17 +23,16 @@ void main() {
     );
 
     expect(find.byKey(const Key('empty-state-art')), findsNothing);
-    expect(find.byKey(const Key('empty-state-art-inner')), findsNothing);
     expect(find.byKey(const Key('empty-state-icon')), findsOneWidget);
     expect(find.text('No stories'), findsOneWidget);
     expect(find.text('New content will appear here.'), findsOneWidget);
     expect(
       tester.getSize(find.byKey(const Key('empty-state-icon'))),
-      const Size(48, 48),
+      const Size(72, 72),
     );
     expect(
       tester.widget<Icon>(find.byKey(const Key('empty-state-icon'))).color,
-      AppColors.blueSoft,
+      AppColors.subtle,
     );
     expect(
       tester
@@ -84,7 +83,7 @@ void main() {
 
     expect(
       tester.getSize(find.byKey(const Key('empty-state-icon'))),
-      const Size(32, 32),
+      const Size(44, 44),
     );
     expect(find.byType(DecoratedBox), findsNothing);
     expect(
@@ -111,7 +110,7 @@ void main() {
     );
     expect(
       tester.widget<Icon>(find.byKey(const Key('empty-state-icon'))).color,
-      AppColors.blueSoft,
+      AppColors.subtle,
     );
 
     await _pump(
@@ -121,7 +120,7 @@ void main() {
     );
     expect(
       tester.widget<Icon>(find.byKey(const Key('empty-state-icon'))).color,
-      AppColors.blueSoft,
+      AppColors.subtle,
     );
   });