fix(a11y): 限制底栏文字缩放并统一播放页触控尺寸

lib/core/widgets/app_bottom_nav.dart

@@ -5,6 +5,8 @@ import 'package:flutter/material.dart';
 import '../theme/app_colors.dart';
 import '../theme/app_dimens.dart';
 
+const double _maxNavigationTextScale = 1.3;
+
 /// 底部导航普通目的地。
 class AppBottomNavItem {
   const AppBottomNavItem({
@@ -41,14 +43,17 @@ class AppBottomNav extends StatelessWidget {
       key: barKey,
       height: AppDimens.navHeight,
       color: AppColors.navBackground,
-      child: Row(
-        children: [
-          for (final item in items)
-            _NavDestination(
-              item: item,
-              unselectedColor: AppColors.navUnselected,
-            ),
-        ],
+      child: MediaQuery.withClampedTextScaling(
+        maxScaleFactor: _maxNavigationTextScale,
+        child: Row(
+          children: [
+            for (final item in items)
+              _NavDestination(
+                item: item,
+                unselectedColor: AppColors.navUnselected,
+              ),
+          ],
+        ),
       ),
     );
     return ColoredBox(

lib/pages/player/widgets/drama_info_sheet.dart

@@ -155,12 +155,12 @@ class _DramaInfoSheetState extends State<DramaInfoSheet> {
     );
   }
 
-  /// 视觉上是个小圆钮，点按区域仍是 40pt，避免太小点不中。
+  /// 视觉上是个小圆钮，点按区域为 44pt。
   Widget _closeButton(AppLocalizations l10n) {
     return SizedBox(
       key: const Key('drama-info-close'),
-      width: 40,
-      height: 40,
+      width: AppDimens.tapTarget,
+      height: AppDimens.tapTarget,
       child: Center(
         child: Semantics(
           button: true,