Update to artist credit handling

src/routes/albums.rs

@@ -162,14 +162,38 @@ async fn add_album(
     if body.artist.is_none() && body.album.is_none() && body.mbid.is_none() {
         return Err(ApiError::BadRequest("provide artist+album or mbid".into()));
     }
-    let summary = shanty_watch::add_album(
+
+    // Try adding with the given MBID first. If it fails (e.g., the MBID is a release-group,
+    // not a release), resolve it to an actual release MBID and retry.
+    let mut mbid = body.mbid.clone();
+    let result = shanty_watch::add_album(
         state.db.conn(),
         body.artist.as_deref(),
         body.album.as_deref(),
-        body.mbid.as_deref(),
+        mbid.as_deref(),
         &state.mb_client,
     )
-    .await?;
+    .await;
+
+    let summary = match result {
+        Ok(s) => s,
+        Err(_) if mbid.is_some() => {
+            // MBID might be a release-group — resolve to the first release
+            let rg_mbid = mbid.as_deref().unwrap();
+            let release_mbid = resolve_release_from_group(&state, rg_mbid).await?;
+            mbid = Some(release_mbid);
+            shanty_watch::add_album(
+                state.db.conn(),
+                body.artist.as_deref(),
+                body.album.as_deref(),
+                mbid.as_deref(),
+                &state.mb_client,
+            )
+            .await?
+        }
+        Err(e) => return Err(e.into()),
+    };
+
     Ok(HttpResponse::Ok().json(serde_json::json!({
         "tracks_added": summary.tracks_added,
         "tracks_already_owned": summary.tracks_already_owned,