Checkpoint web-player design-system refactor and backend track genre tagging

Advances the ongoing token/componentization cleanup (anchored player dock,
border-based panels instead of floating shadows, corrected light-mode
accent/gradient tokens) alongside in-progress backend support for track
genre tags.

web-player/src/lib/components/player/TrackInfo.svelte

@@ -32,10 +32,10 @@
 			trackId={player.current.id}
 			size="small"
 			alt={player.current.title}
-			class="h-11 w-11 shrink-0 rounded-[11px] shadow-cover-xs md:h-12 md:w-12"
+			class="h-11 w-11 shrink-0 rounded-xl md:h-12 md:w-12"
 		/>
 	{:else}
-		<div class="h-11 w-11 shrink-0 rounded-[11px] bg-surface shadow-cover-xs md:h-12 md:w-12"></div>
+		<div class="h-11 w-11 shrink-0 rounded-xl bg-surface md:h-12 md:w-12"></div>
 	{/if}
 	<div class="min-w-0 flex-1">
 		<div class="flex min-w-0 items-center gap-1.5">