feat(widgets): VideoPlayer data-aksrt-video shared player shell

Route non-embed videos through video-player.js with poster/type/autoplay
loop/muted attrs; keep platform iframe embeds; admin empty warning.

assets/js/video-player.js

@@ -65,6 +65,8 @@
     this.poster = this.el.dataset.poster || '';
     this.type = this.el.dataset.type || detectType(this.src);
     this.autoplay = this.el.dataset.autoplay === 'true';
+    this.loop = this.el.dataset.loop === 'true';
+    this.muted = this.el.dataset.muted === 'true' || this.autoplay;
     this.init();
   }
 
@@ -76,8 +78,10 @@
     this.video.controls = true;
     this.video.playsInline = true;
     this.video.preload = this.autoplay ? 'auto' : 'metadata';
+    if (this.loop) this.video.loop = true;
+    if (this.muted) this.video.muted = true;
     if (this.poster) this.video.poster = this.poster;
-    this.video.style.cssText = 'display:block;width:100%;height:auto;max-height:70vh;';
+    this.video.style.cssText = 'display:block;width:100%;height:100%;object-fit:contain;max-height:none;';
 
     // Play overlay
     this.overlay = document.createElement('div');