fix: 评论区跳转视频页pic null

lib/http/search.dart

@@ -163,4 +163,20 @@ class SearchHttp {
       };
     }
   }
+
+  static Future<Map<String, dynamic>> ab2cWithPic(
+      {int? aid, String? bvid}) async {
+    Map<String, dynamic> data = {};
+    if (aid != null) {
+      data['aid'] = aid;
+    } else if (bvid != null) {
+      data['bvid'] = bvid;
+    }
+    final dynamic res =
+        await Request().get(Api.ab2c, data: <String, dynamic>{...data});
+    return {
+      'cid': res.data['data'].first['cid'],
+      'pic': res.data['data'].first['first_frame'],
+    };
+  }
 }

lib/pages/video/detail/controller.dart

@@ -547,7 +547,7 @@ class VideoDetailController extends GetxController
   }
 
   void updateCover(String? pic) {
-    if (pic != null && pic != '') {
+    if (pic != null) {
       cover.value = videoItem['pic'] = pic;
     }
   }

lib/utils/url_utils.dart

@@ -42,12 +42,14 @@ class UrlUtils {
     final Map matchRes = IdUtils.matchAvorBv(input: pathSegment);
     if (matchRes.containsKey('BV')) {
       final String bv = matchRes['BV'];
-      final int cid = await SearchHttp.ab2c(bvid: bv);
+      final Map res = await SearchHttp.ab2cWithPic(bvid: bv);
+      final int cid = res['cid'];
+      final String pic = res['pic'];
       final String heroTag = Utils.makeHeroTag(bv);
       await Get.toNamed(
         '/video?bvid=$bv&cid=$cid',
         arguments: <String, String?>{
-          'pic': '',
+          'pic': pic,
           'heroTag': heroTag,
         },
       );