revert: YouTube 재생목록 chip 원본 디자인으로 복원 + repurpose 스크롤바 표시

- YouTubeAudit: '재생목록' chip 을 원본(흰색 단순 chip, Play 아이콘 제거)으로 복원
- AssetCollection: Top Videos for Repurposing 가로 스크롤바 hide 제거

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/features/plan/components/AssetCollection.tsx

@@ -155,7 +155,7 @@ export default function AssetCollection({ data }: AssetCollectionProps) {
           <h3 className="font-serif text-2xl font-bold text-brand-navy mb-4">
             YouTube Top Videos for Repurposing
           </h3>
-          <div className="flex overflow-x-auto gap-4 pb-4 scrollbar-hide" style={{ scrollbarWidth: 'none' }}>
+          <div className="flex overflow-x-auto gap-4 pb-4">
             {data.youtubeRepurpose.map((video, i) => (
               <motion.div
                 key={video.title}

src/features/report/components/YouTubeAudit.tsx

@@ -1,5 +1,5 @@
 import { motion } from 'motion/react';
-import { Youtube, Users, Video, Eye, TrendingUp, ExternalLink, Play } from 'lucide-react';
+import { Youtube, Users, Video, Eye, TrendingUp, ExternalLink } from 'lucide-react';
 import { SectionWrapper } from './ui/SectionWrapper';
 import { EmptyState } from './ui/EmptyState';
 import { MetricCard } from './ui/MetricCard';
@@ -123,9 +123,8 @@ export default function YouTubeAudit({ data }: YouTubeAuditProps) {
             {data.playlists.map((pl) => (
               <span
                 key={pl}
-                className="inline-flex items-center gap-1.5 rounded-full bg-rose-50 border border-rose-200 px-3 py-1 text-sm font-medium text-rose-700"
+                className="rounded-full bg-white/60 backdrop-blur-sm border border-white/40 px-3 py-1 text-sm font-medium text-slate-700"
               >
-                <Play size={12} className="text-rose-500 fill-rose-500" />
                 {pl}
               </span>
             ))}