feat(music): 모바일 반응형 — FAB + 풀다운 리프레시 + 1컬럼 라이브러리

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

src/pages/music/MusicStudio.css

@@ -1696,6 +1696,18 @@
 /* ═══════════════════════════════════════════════════
    MOBILE
 ═══════════════════════════════════════════════════ */
+@media (max-width: 768px) {
+    .ms-tabs {
+        overflow-x: auto;
+        -webkit-overflow-scrolling: touch;
+    }
+
+    .ms-tabs > * {
+        flex-shrink: 0;
+        white-space: nowrap;
+    }
+}
+
 @media (max-width: 480px) {
     .ms-header__title {
         font-size: clamp(44px, 14vw, 70px);