fix(theme): stream video conversion progress and auto-play v1 theme media

src/app.css

@@ -172,4 +172,17 @@
   [role="button"]:not([disabled]) {
     cursor: pointer;
   }
+
+  /* Suppress browser and WebKit native media controls and overlay play buttons on theme videos */
+  video::-webkit-media-controls,
+  video::-webkit-media-controls-enclosure,
+  video::-webkit-media-controls-panel,
+  video::-webkit-media-controls-play-button,
+  video::-webkit-media-controls-start-playback-button,
+  video::-webkit-media-controls-overlay-play-button {
+    display: none !important;
+    -webkit-appearance: none !important;
+    opacity: 0 !important;
+    pointer-events: none !important;
+  }
 }