style: 调整继续观看按钮样式

docs/plans/PROGRESS.md

@@ -1249,3 +1249,8 @@ $ flutter test
 - 追剧与历史页增加 keep-alive，tab 与编辑态改用局部 ValueNotifier 更新，切换不再重建整个页面。
 - 编辑图标调整为 20、`#B0B0B0`，热区 40×40，保持右侧 14 边距和垂直居中。
 - 列表刷新期间保留已有数据与各页滚动位置；`flutter analyze`：No issues found。
+
+## 2026-10-22 播放历史继续观看按钮微调
+
+- 继续观看改为无边框、无底色的纯文字按钮，默认 `#B0B0B0`、12/w500，按压态使用品牌色。
+- 保持 28 高点击热区和右侧零间距；未执行测试或 analyze。

lib/pages/following/following_history_card.dart

@@ -205,20 +205,26 @@ class FollowingHistoryCard extends StatelessWidget {
   Widget _continueButton(AppLocalizations l10n) {
     return SizedBox(
       height: AppDimens.followingHistoryActionHeight,
-      child: OutlinedButton(
+      child: TextButton(
         key: Key('following-history-continue-$dramaId'),
         onPressed: onContinue,
-        style: OutlinedButton.styleFrom(
-          foregroundColor: AppColors.textPrimary,
-          side: const BorderSide(color: AppColors.textPrimary),
-          padding: const EdgeInsets.symmetric(horizontal: 10),
-          minimumSize: Size.zero,
+        style: ButtonStyle(
+          foregroundColor: WidgetStateProperty.resolveWith(
+            (states) => states.contains(WidgetState.pressed)
+                ? AppColors.primary
+                : AppColors.textTabInactive,
+          ),
+          backgroundColor: const WidgetStatePropertyAll(AppColors.transparent),
+          overlayColor: const WidgetStatePropertyAll(AppColors.transparent),
+          padding: const WidgetStatePropertyAll(EdgeInsets.zero),
+          minimumSize: const WidgetStatePropertyAll(Size.zero),
           tapTargetSize: MaterialTapTargetSize.shrinkWrap,
           visualDensity: VisualDensity.compact,
-          shape: const StadiumBorder(),
-          textStyle: const TextStyle(
-            fontSize: AppDimens.followingSubtitleFont,
-            fontWeight: FontWeight.w400,
+          textStyle: const WidgetStatePropertyAll(
+            TextStyle(
+              fontSize: AppDimens.followingSubtitleFont,
+              fontWeight: FontWeight.w500,
+            ),
           ),
         ),
         child: Text(l10n.continueWatching),