Bump version to 1.5.0.12 and update changelog in manifest.json

Jellyfin.Plugin.MediaBarEnhanced/Web/mediaBarEnhanced.css

@@ -371,7 +371,11 @@
 .video-container.active {
   opacity: 1;
   pointer-events: auto;
-  width: 100% !important; /* Force width when active, matching upstream logic behavior */
+}
+
+.video-player {
+    width: 100%;
+    height: 100%;
 }
 
 /* Ensure video inside container fills it */
@@ -418,6 +422,10 @@
   object-position: center 20%;
   border-radius: 5px;
   z-index: 3;
+  transition:
+    width 0.5s ease-in-out,
+    mask-image 0.5s ease-in-out,
+    -webkit-mask-image 0.5s ease-in-out;
   mask-image: linear-gradient(to top,
       #fff0 2%,
       rgb(0 0 0 / 0.5) 6%,