opt: get theme color

Signed-off-by: bggRGjQaUbCoE <githubaccount56556@proton.me>

lib/pages/setting/recommend_setting.dart

@@ -8,6 +8,7 @@ class RecommendSetting extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
+    final theme = Theme.of(context);
     return Scaffold(
       appBar: showAppBar == false ? null : AppBar(title: const Text('推荐流设置')),
       body: ListView(
@@ -20,9 +21,8 @@ class RecommendSetting extends StatelessWidget {
               '* 其它（如热门视频、手动搜索、链接跳转等）均不受过滤器影响。\n'
               '* 设定较严苛的条件可导致推荐项数锐减或多次请求，请酌情选择。\n'
               '* 后续可能会增加更多过滤条件，敬请期待。',
-              style: Theme.of(context).textTheme.labelSmall!.copyWith(
-                  color:
-                      Theme.of(context).colorScheme.outline.withOpacity(0.7)),
+              style: theme.textTheme.labelSmall!
+                  .copyWith(color: theme.colorScheme.outline.withOpacity(0.7)),
             ),
           ),
           SizedBox(height: MediaQuery.paddingOf(context).bottom + 80),