style(ui): 统一页面字号间距与状态样式

lib/core/widgets/app_bottom_nav.dart

@@ -30,15 +30,18 @@ class AppBottomNav extends StatelessWidget {
     super.key,
     required this.items,
     this.backgroundColor = AppColors.bar,
+    this.barKey,
   });
 
   final List<AppBottomNavItem> items;
   final Color backgroundColor;
+  final Key? barKey;
 
   @override
   Widget build(BuildContext context) => SafeArea(
     top: false,
     child: Container(
+      key: barKey,
       height: AppDimens.navHeight,
       decoration: BoxDecoration(
         color: backgroundColor,
@@ -81,7 +84,7 @@ class _NavDestination extends StatelessWidget {
                 ),
                 decoration: BoxDecoration(
                   color: item.selected ? AppColors.blue : Colors.transparent,
-                  borderRadius: BorderRadius.circular(14),
+                  borderRadius: BorderRadius.circular(AppDimens.pillRadius),
                 ),
                 child: Icon(
                   item.selected ? item.selectedIcon : item.icon,

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),
+            ),
           ),
         ],
       ],

lib/core/widgets/library_drama_tile.dart

@@ -4,6 +4,7 @@ import 'package:flutter/material.dart';
 
 import '../data/models/drama.dart';
 import '../theme/app_colors.dart';
+import '../theme/app_dimens.dart';
 import 'remote_image.dart';
 
 /// 收藏等账号列表复用的剧集卡片，视觉与"我的"页列表保持一致。
@@ -23,16 +24,16 @@ class LibraryDramaTile extends StatelessWidget {
   Widget build(BuildContext context) {
     return Material(
       color: AppColors.card,
-      borderRadius: BorderRadius.circular(12),
+      borderRadius: BorderRadius.circular(AppDimens.innerRadius),
       clipBehavior: Clip.antiAlias,
       child: InkWell(
         onTap: onTap,
         child: Padding(
-          padding: const EdgeInsets.all(9),
+          padding: const EdgeInsets.all(AppDimens.innerPadding),
           child: Row(
             children: [
               ClipRRect(
-                borderRadius: BorderRadius.circular(8),
+                borderRadius: BorderRadius.circular(AppDimens.innerRadius),
                 child: RemoteImage(drama.posterUrl, width: 74, height: 103),
               ),
               const SizedBox(width: 11),
@@ -46,7 +47,7 @@ class LibraryDramaTile extends StatelessWidget {
                       overflow: TextOverflow.ellipsis,
                       style: const TextStyle(
                         color: Colors.white,
-                        fontSize: 15,
+                        fontSize: AppDimens.listTitle,
                         fontWeight: FontWeight.w700,
                       ),
                     ),
@@ -57,7 +58,7 @@ class LibraryDramaTile extends StatelessWidget {
                       overflow: TextOverflow.ellipsis,
                       style: const TextStyle(
                         color: AppColors.muted,
-                        fontSize: 12,
+                        fontSize: AppDimens.caption,
                       ),
                     ),
                   ],