feat(search): add carousel for artists and view more cards

- Albums: 30 results with view more card if total > 30
- Artists: 12 results with carousel navigation
- Artists carousel: same pagination logic as albums
- View more cards: 160x220px dashed border, navigate to tab
- Artists gap: reduced to 16px (same as albums)
- Separate page tracking for albums and artists

cp

src-tauri/src/commands/search.rs

@@ -64,9 +64,9 @@ pub async fn search_all(
     let client = state.client.lock().await;
     
     let (albums_result, tracks_result, artists_result) = tokio::join!(
-        client.search_albums(&query, 20, 0),
+        client.search_albums(&query, 30, 0),
         client.search_tracks(&query, 8, 0),
-        client.search_artists(&query, 5, 0)
+        client.search_artists(&query, 12, 0)
     );
 
     Ok(SearchAllResults {