feat(discovery): Discovery settings section (enable + tuning knobs)

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

web/src/app/settings/settings-form.tsx

@@ -24,6 +24,8 @@ export function SettingsForm() {
   const [saved, setSaved] = useState(false);
   const [scanResult, setScanResult] = useState<string | null>(null);
   const [scanRequested, setScanRequested] = useState(false);
+  const [discoverCfg, setDiscoverCfg] = useState<Record<string, string>>({});
+  const [discoverSaved, setDiscoverSaved] = useState(false);
 
   useEffect(() => {
     fetch("/api/scan")
@@ -62,6 +64,12 @@ export function SettingsForm() {
       });
   }, []);
 
+  useEffect(() => {
+    fetch("/api/discover/config")
+      .then((r) => r.json())
+      .then((c: Record<string, string>) => setDiscoverCfg(c));
+  }, []);
+
   async function submit(e: React.FormEvent) {
     e.preventDefault();
     await fetch("/api/config", {
@@ -78,6 +86,21 @@ export function SettingsForm() {
     setKeySet(keySet || slskdApiKey !== "");
   }
 
+  function setCfg(key: string, value: string) {
+    setDiscoverCfg((c) => ({ ...c, [key]: value }));
+  }
+
+  async function saveDiscovery(e: React.FormEvent) {
+    e.preventDefault();
+    await fetch("/api/discover/config", {
+      method: "PATCH",
+      headers: { "content-type": "application/json" },
+      body: JSON.stringify(discoverCfg),
+    });
+    setDiscoverSaved(true);
+    setTimeout(() => setDiscoverSaved(false), 1500);
+  }
+
   return (
     <>
       <form onSubmit={submit}>
@@ -107,6 +130,38 @@ export function SettingsForm() {
         </button>
         {scanResult ? <p aria-label="scan result">Last scan: {scanResult}</p> : null}
       </section>
+      <form onSubmit={saveDiscovery}>
+        <h2>Discovery</h2>
+        <label>
+          <input
+            type="checkbox"
+            checked={discoverCfg["discover.enabled"] === "true"}
+            onChange={(e) => setCfg("discover.enabled", e.target.checked ? "true" : "false")}
+          />{" "}
+          Enable scheduled discovery sweep
+        </label>
+        {[
+          ["discover.intervalHours", "Interval (hours)"],
+          ["discover.maxSeeds", "Max seeds per sweep"],
+          ["discover.similarPerSeed", "Similar per seed"],
+          ["discover.albumsPerArtist", "Albums per artist"],
+          ["discover.minScore", "Min score"],
+        ].map(([key, label]) => (
+          <p key={key}>
+            <label>
+              {label}:{" "}
+              <input
+                type="number"
+                step="any"
+                value={discoverCfg[key] ?? ""}
+                onChange={(e) => setCfg(key, e.target.value)}
+              />
+            </label>
+          </p>
+        ))}
+        <button type="submit">Save discovery settings</button>
+        {discoverSaved && <span> Saved.</span>}
+      </form>
     </>
   );
 }