Rename playlist discovery page and include the playlist description in the layout

src/routes/tools/+page.svelte

@@ -7,7 +7,7 @@
       { name: 'Compare Play Histories', href: '/tools/compare-histories', desc: 'Find songs A played that B has not' },
       { name: 'Player Playlist Gaps', href: '/tools/player-playlist-gaps', desc: 'Upload a playlist and find songs a player has not played' },
       { name: 'Player Head-to-Head', href: '/tools/player-headtohead', desc: 'Compare two players on the same map/difficulty' },
-      { name: 'Map Pack Discovery', href: '/tools/map-pack-discovery', desc: 'Browse curated BeatSaver playlists with mapper context' }
+      { name: 'Playlist Discovery', href: '/tools/playlist-discovery', desc: 'Browse verified BeatSaver playlists sorted by recency' }
     ] as tool}
       <a href={tool.href} class="card-surface p-5 block">
         <div class="font-semibold">{tool.name}</div>