feat(insta): swap google_trends source for youtube_trending (Google Trends API 폐기 대응)

src/pages/insta/InstaCards.jsx

@@ -181,7 +181,7 @@ function ExternalTrendsPanel({ onCreateSlate }) {
   const load = useCallback(async () => {
     const [n, g] = await Promise.all([
       getInstaTrends({ source: 'naver_popular', days: 2 }),
-      getInstaTrends({ source: 'google_trends', days: 2 }),
+      getInstaTrends({ source: 'youtube_trending', days: 2 }),
     ]);
     setNaver(n.items || []);
     setGoogle(g.items || []);
@@ -254,7 +254,7 @@ function ExternalTrendsPanel({ onCreateSlate }) {
           ))}
         </div>
         <div className="ic-trends__col">
-          <h4>🌐 Google Trends</h4>
+          <h4>📺 YouTube 인기</h4>
           {google.length === 0 && <p className="ic-empty">없음</p>}
           {google.map(renderRow)}
         </div>