fix: Embed player UI, stats loading, and share URL

- Remove black background from embed video to allow transparency
- Update "Watch on Bitvid" button to "Watch on" + white logo
- Fix share URL generation to point to main site instead of embed
- Ensure view counts and reactions are subscribed in embed mode

embed.html

@@ -79,7 +79,7 @@
       >
         <video
           id="embedVideo"
-          class="h-full w-full object-contain bg-black"
+          class="h-full w-full object-contain"
           controls
           playsinline
           preload="metadata"
@@ -97,12 +97,12 @@
               target="_blank"
               class="flex items-center gap-2 rounded-full border border-white/20 bg-white/10 px-3 py-1.5 text-xs font-medium text-white transition-colors hover:bg-white/20 backdrop-blur-md"
             >
+              <span>Watch on</span>
               <img
                 src="assets/svg/bitvid-logo-light-mode.svg"
                 alt="BitVid"
-                class="h-4 w-auto"
+                class="h-4 w-auto invert brightness-0"
               />
-              <span>Watch on BitVid</span>
             </a>
 
             <div