feat(flutter): 首页频道叠加轮播并改下划线选中

lib/pages/discover/widgets/feed_banner_carousel.dart

@@ -27,6 +27,7 @@ class FeedBannerCarousel extends StatefulWidget {
     required this.onOpen,
     this.active = true,
     this.dramaFor,
+    this.flush = false,
   });
 
   final List<FeedBanner> banners;
@@ -34,6 +35,9 @@ class FeedBannerCarousel extends StatefulWidget {
   final bool active;
   final Drama? Function(FeedBanner banner)? dramaFor;
 
+  /// 首页 hero 铺满屏幕并去掉圆角；发现页保持默认 false。
+  final bool flush;
+
   @override
   State<FeedBannerCarousel> createState() => _FeedBannerCarouselState();
 }
@@ -161,10 +165,14 @@ class _FeedBannerCarouselState extends State<FeedBannerCarousel> {
     final banner = widget.banners[index];
     final dramaId = banner.dramaId;
     final drama = widget.dramaFor?.call(banner);
+    final radius = widget.flush
+        ? 0.0
+        : (drama == null
+              ? AppDimens.authCardRadius
+              : AppDimens.heroBannerRadius);
+    final borderRadius = BorderRadius.circular(radius);
     final card = ClipRRect(
-      borderRadius: BorderRadius.circular(
-        drama == null ? AppDimens.authCardRadius : AppDimens.heroBannerRadius,
-      ),
+      borderRadius: borderRadius,
       child: Stack(
         fit: StackFit.expand,
         children: [
@@ -225,11 +233,7 @@ class _FeedBannerCarouselState extends State<FeedBannerCarousel> {
           ? card
           : Material(
               color: Colors.transparent,
-              borderRadius: BorderRadius.circular(
-                drama == null
-                    ? AppDimens.authCardRadius
-                    : AppDimens.heroBannerRadius,
-              ),
+              borderRadius: borderRadius,
               clipBehavior: Clip.antiAlias,
               child: InkWell(
                 key: Key('feed-banner-$index'),