style(ui): 统一页面字号间距与状态样式

lib/core/widgets/empty_state.dart

@@ -3,6 +3,7 @@
 import 'package:flutter/material.dart';
 
 import '../theme/app_colors.dart';
+import '../theme/app_dimens.dart';
 
 const double _regularIconSize = 48;
 const double _compactIconSize = 32;
@@ -139,7 +140,7 @@ class _EmptyCopy extends StatelessWidget {
               textAlign: TextAlign.center,
               style: const TextStyle(
                 color: AppColors.muted,
-                fontSize: 12.5,
+                fontSize: AppDimens.caption,
                 height: 1.45,
               ),
             ),
@@ -151,11 +152,14 @@ class _EmptyCopy extends StatelessWidget {
             key: actionKey ?? const Key('empty-state-action'),
             onPressed: onAction,
             style: TextButton.styleFrom(
-              foregroundColor: scheme.primary,
+              foregroundColor: AppColors.blueSoft,
               minimumSize: const Size(44, _actionMinHeight),
               padding: const EdgeInsets.symmetric(horizontal: 14),
             ),
-            child: Text(actionLabel!, style: const TextStyle(fontSize: 13)),
+            child: Text(
+              actionLabel!,
+              style: const TextStyle(fontSize: AppDimens.body),
+            ),
           ),
         ],
       ],