fix: use collection title for subdirectory name

修复合集目录名称问题：
- 添加 collectionTitle 字段存储视频合集标题（ugc_season.title）
- 创建子目录时使用合集名称而非视频标题

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

web/src/work/view/parseModal.ts

@@ -156,9 +156,12 @@ export class ParseModalComp implements VanComponent {
             const activeVideoInfo = getActiveFormatVideo(info.info!, info.info!.accept_quality[info.formatIndex.val], this.preferredCodec.val)
             const pagesLength = workRoute.videoInfoCardData.val.pages.length
             // 合集标题，用于创建子目录
-            // season 模式（番剧）或有多个 section（视频合集）时创建子目录
-            const hasMultipleSections = workRoute.videoInfoCardData.val.section.length > 0
-            const seasonTitle = (workRoute.videoInfoCardMode.val == 'season' || (isVideoMode && hasMultipleSections)) ? cardTitle.trim() : undefined
+            // season 模式（番剧）使用视频标题
+            // video 模式有 collectionTitle（视频合集）时使用合集名称
+            const collectionTitle = workRoute.videoInfoCardData.val.collectionTitle
+            const seasonTitle = workRoute.videoInfoCardMode.val == 'season'
+                ? cardTitle.trim()
+                : (isVideoMode && collectionTitle ? collectionTitle.trim() : undefined)
 
             return ({
                 bvid: info.page.bvid,