feat(preview): link discovery feed + Find-similar to the artist preview

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

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

@@ -26,6 +26,7 @@ export function DiscoverClient() {
   const [query, setQuery] = useState("");
   const [search, setSearch] = useState<SearchResult | null>(null);
   const [busy, setBusy] = useState(false);
+  const [followedSimilar, setFollowedSimilar] = useState<Set<string>>(new Set());
 
   const loadFeed = useCallback(async () => {
     setFeed(await (await fetch("/api/discover")).json());
@@ -70,6 +71,17 @@ export function DiscoverClient() {
     }
   }
 
+  async function followSimilar(a: { mbid: string; name: string }) {
+    const res = await fetch("/api/artists", {
+      method: "POST",
+      headers: { "content-type": "application/json" },
+      body: JSON.stringify({ mbid: a.mbid, name: a.name }),
+    });
+    if (res.ok || res.status === 409) {
+      setFollowedSimilar((s) => new Set(s).add(a.mbid));
+    }
+  }
+
   async function act(id: string, action: "follow" | "want" | "dismiss") {
     await fetch(`/api/discover/${id}`, {
       method: "POST",
@@ -104,7 +116,13 @@ export function DiscoverClient() {
           <ul>
             {search.similar.map((s) => (
               <li key={s.mbid}>
-                {s.name} <small>({s.score.toFixed(1)})</small>
+                <a href={`/discover/artist/${s.mbid}?name=${encodeURIComponent(s.name)}`}>{s.name}</a>{" "}
+                <small>({s.score.toFixed(1)})</small>{" "}
+                {followedSimilar.has(s.mbid) ? (
+                  <span>Followed</span>
+                ) : (
+                  <button onClick={() => followSimilar(s)}>Follow</button>
+                )}
               </li>
             ))}
           </ul>
@@ -116,7 +134,11 @@ export function DiscoverClient() {
         <ul>
           {feed.artists.map((s) => (
             <li key={s.id}>
-              <strong>{s.artistName}</strong>{" "}
+              <strong>
+                <a href={`/discover/artist/${s.artistMbid}?name=${encodeURIComponent(s.artistName)}`}>
+                  {s.artistName}
+                </a>
+              </strong>{" "}
               <small>score {s.score.toFixed(2)} · {s.seedCount} seed(s) · {s.sources.join(", ")}</small>{" "}
               <button onClick={() => act(s.id, "follow")}>Follow</button>{" "}
               <button onClick={() => act(s.id, "dismiss")}>Dismiss</button>
@@ -130,7 +152,14 @@ export function DiscoverClient() {
         <ul>
           {feed.albums.map((s) => (
             <li key={s.id}>
-              <strong>{s.album}</strong> — {s.artistName}{" "}
+              <strong>
+                <a
+                  href={`/discover/artist/${s.artistMbid}?name=${encodeURIComponent(s.artistName)}#rg-${s.rgMbid}`}
+                >
+                  {s.album}
+                </a>
+              </strong>{" "}
+              — {s.artistName}{" "}
               <small>score {s.score.toFixed(2)}</small>{" "}
               <button onClick={() => act(s.id, "want")}>Want</button>{" "}
               <button onClick={() => act(s.id, "dismiss")}>Dismiss</button>