feat(artists): link live-search hits to the artist preview page

Each MB search result on /artists now links its name to
/discover/artist/[mbid] (the read-only disco + tracklist + own-state
preview), so you can preview before following there too — same wiring
the discovery feed already uses.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

web/src/app/artists/artists-client.tsx

@@ -77,7 +77,7 @@ export function ArtistsClient() {
         <ul>
           {hits.map((h) => (
             <li key={h.mbid}>
-              {h.name}
+              <a href={`/discover/artist/${h.mbid}?name=${encodeURIComponent(h.name)}`}>{h.name}</a>
               {h.disambiguation ? ` (${h.disambiguation})` : ""}{" "}
               {followedMbids.has(h.mbid) ? (
                 <span> · following</span>