Fix PreviewPlayer layout: replace size-full with w-full to allow aspect-ratio CSS to work

When scrubbing in RecordingView, tall cameras passed size-full (width:100% + height:100%)
to PreviewPlayer, causing the browser to ignore aspect-ratio. Replacing size-full with
w-full lets height be computed from width + aspect-ratio, preserving correct proportions.

https://claude.ai/code/session_019sUH2h6HoVswdtD7EbhAJa

web/src/components/player/dynamic/DynamicVideoPlayer.tsx

@@ -326,7 +326,7 @@ export default function DynamicVideoPlayer({
       )}
       <PreviewPlayer
         className={cn(
-          className,
+          className?.replace(/\bsize-full\b/g, "w-full"),
           isScrubbing || isLoading ? "visible" : "hidden",
         )}
         camera={camera}