refactor(web-player): let TrackTable declare its own columns

Every one of the seven tables repeated the same header markup and hand
written grid templates, always in the same shape: an optional index, the
title, optional desktop-only meta columns, the duration and an optional
action. TrackTable now takes that shape as props and builds both grid
templates and the headers itself.

web-player/src/routes/(app)/albums/[id]/components/LibraryPicker.svelte

@@ -27,12 +27,7 @@
 
 <div class="mt-10 sm:mt-12">
 	<SectionHeading title="Tus canciones subidas" />
-	<TrackTable columns="1fr 64px 36px" columnsMobile="1fr 52px 32px">
-		{#snippet headers()}
-			<span>Título</span>
-			<span class="hidden text-center sm:block">Duración</span>
-			<span></span>
-		{/snippet}
+	<TrackTable action>
 		{#each library as track, i (track.id)}
 			<TrackRow>
 				<TrackTitleCell