feat: add back-and-forth animation for media title and artist overflow labels

src/browser/base/zen-components/ZenMediaController.mjs

@@ -168,9 +168,22 @@ class ZenMediaController {
         },
         {}
       );
+      this.addLabelOverflows();
     });
   }
 
+  addLabelOverflows() {
+    const elements = [this.mediaTitle, this.mediaArtist];
+    for (const element of elements) {
+      const parent = element.parentElement;
+      if (element.scrollWidth > parent.clientWidth) {
+        element.setAttribute('overflow', '');
+      } else {
+        element.removeAttribute('overflow');
+      }
+    }
+  }
+
   setupMediaController(mediaController, browser) {
     this._currentMediaController = mediaController;
     this._currentBrowser = browser;