feat(ui): 增加视觉 token 与统一导航

test/theme/app_dimens_test.dart

@@ -0,0 +1,23 @@
+// Author: fruit.com.cn
+
+import 'package:flutter_test/flutter_test.dart';
+import 'package:fruitshorts/core/theme/app_dimens.dart';
+
+void main() {
+  test('should_expose_the_k20_spacing_and_type_scale', () {
+    expect(AppDimens.pageHorizontal, 16);
+    expect(AppDimens.cardRadius, 16);
+    expect(AppDimens.innerRadius, 12);
+    expect(AppDimens.caption, 12);
+    expect(AppDimens.body, 14);
+    expect(AppDimens.listTitle, 15);
+    expect(AppDimens.sectionTitle, 16);
+    expect(AppDimens.pageTitle, 20);
+    expect(AppDimens.navLabel, 11);
+    expect(AppDimens.buttonHeight, 48);
+    expect(AppDimens.primaryButtonHeight, 52);
+    expect(AppDimens.tapTarget, 44);
+    expect(AppDimens.navHeight, 64);
+    expect(AppDimens.progressHeight, 4);
+  });
+}