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/ui/GlassMenu.svelte

@@ -10,6 +10,6 @@
 	let { class: klass = '', style = '', children }: Props = $props();
 </script>
 
-<div class="glass-panel animate-pop rounded-panel p-1.5 shadow-menu {klass}" {style}>
+<div class="glass-panel animate-pop rounded-panel border border-hairline p-1.5 {klass}" {style}>
 	{@render children()}
 </div>