fix(player): left-align the big-view control bar so overflow scrolls from the start

justify-center + overflow-x-auto stranded the left-end controls (Previous, the
N/M counter) when the bar overflowed a narrow window. justify-start makes the
overflow scroll from the start — and matches the conventional left-aligned
video-player control bar.

frontend/src/components/PlayerModal.tsx

@@ -877,7 +877,7 @@ export default function PlayerModal({
             {(maximized || isFullscreen) && (
               <div
                 onClick={(e) => e.stopPropagation()}
-                className="absolute inset-x-0 bottom-0 z-menu flex h-14 items-center justify-center gap-x-3 overflow-x-auto border-t border-white/10 bg-neutral-950/95 px-3 text-sm text-white"
+                className="absolute inset-x-0 bottom-0 z-menu flex h-14 items-center justify-start gap-x-3 overflow-x-auto border-t border-white/10 bg-neutral-950/95 px-3 text-sm text-white"
               >
                 {hasQueue && (
                   <>