Improve Genius artist search for manual matching (#233)

The manual match modal for Genius only returned 0 or 1 artist result
because search_artist() searched songs (per_page=5), extracted the
primary artist, and returned the first match or None.

Added search_artists() that returns multiple unique artists extracted
from song results with broader search (per_page=20). The manual match
endpoint now shows up to 8 artist candidates and multiple track results
instead of one-or-nothing. Also shows the Genius URL as extra info.

core/genius_client.py

@@ -212,24 +212,47 @@ class GeniusClient:
         Returns:
             Artist dict with: id, name, url, image_url
         """
-        hits = self.search(artist_name, per_page=5)
-        if not hits:
+        artists = self.search_artists(artist_name, limit=10)
+        if not artists:
             return None
 
         artist_lower = artist_name.lower().strip()
 
-        for hit in hits:
-            result = hit.get('result', {})
-            primary = result.get('primary_artist', {})
-            primary_name = (primary.get('name') or '').lower()
-            if primary and (artist_lower in primary_name or primary_name in artist_lower):
-                logger.debug(f"Found artist: {primary.get('name')}")
-                return primary
+        for a in artists:
+            a_name = (a.get('name') or '').lower()
+            if artist_lower in a_name or a_name in artist_lower:
+                logger.debug(f"Found artist: {a.get('name')}")
+                return a
 
         # No confident match — let the worker mark as not_found and retry later
         logger.debug(f"No artist match found in search results for: {artist_name}")
         return None
 
+    @rate_limited
+    def search_artists(self, query: str, limit: int = 10) -> List[Dict[str, Any]]:
+        """
+        Search for artists by name. Extracts unique artists from song results.
+
+        Returns:
+            List of artist dicts with: id, name, url, image_url
+        """
+        hits = self.search(query, per_page=min(limit * 2, 20))
+        if not hits:
+            return []
+
+        seen_ids = set()
+        artists = []
+        for hit in hits:
+            result = hit.get('result', {})
+            primary = result.get('primary_artist', {})
+            if primary and primary.get('id') and primary['id'] not in seen_ids:
+                seen_ids.add(primary['id'])
+                artists.append(primary)
+                if len(artists) >= limit:
+                    break
+
+        return artists
+
     @rate_limited
     def get_artist(self, artist_id: int) -> Optional[Dict[str, Any]]:
         """

web_server.py

@@ -12614,15 +12614,22 @@ def _search_service(service, entity_type, query):
             raise ValueError("Genius worker not initialized")
         client = genius_worker.client
         if entity_type == 'artist':
-            result = client.search_artist(query)
-            if result:
-                return [{'id': str(result.get('id', '')), 'name': result.get('name', ''),
-                         'image': result.get('image_url'), 'extra': ''}]
+            artists = client.search_artists(query, limit=8)
+            return [{'id': str(a.get('id', '')), 'name': a.get('name', ''),
+                     'image': a.get('image_url'), 'extra': a.get('url', '')} for a in artists]
         elif entity_type == 'track':
-            result = client.search_song(query, '')
-            if result:
-                return [{'id': str(result.get('id', '')), 'name': result.get('title', ''),
-                         'image': result.get('song_art_image_url'), 'extra': result.get('artist_names', '')}]
+            # Search with broader results for manual matching
+            hits = client.search(f"{query}", per_page=10)
+            results = []
+            seen_ids = set()
+            for hit in hits:
+                r = hit.get('result', {})
+                rid = r.get('id')
+                if rid and rid not in seen_ids:
+                    seen_ids.add(rid)
+                    results.append({'id': str(rid), 'name': r.get('title', ''),
+                                    'image': r.get('song_art_image_url'), 'extra': r.get('artist_names', '')})
+            return results
         return []
 
     elif service == 'tidal':