feat(library): expose v2_library_list_folder_tracks_recursive

Tauri wrapper for the qbz-library primitive added in the previous
commit. V2 cleanroom: direct call into qbz-library, no legacy
delegation. Registered in lib.rs alongside the existing folder-tree
commands.

cc

src-tauri/src/commands_v2/library.rs

@@ -2660,6 +2660,25 @@ pub async fn v2_library_list_folder_tracks(
         .map_err(|e| e.to_string())
 }
 
+#[tauri::command]
+#[allow(non_snake_case)]
+pub async fn v2_library_list_folder_tracks_recursive(
+    folderPath: String,
+    state: State<'_, LibraryState>,
+) -> Result<Vec<LocalTrack>, String> {
+    log::info!(
+        "Command: v2_library_list_folder_tracks_recursive {}",
+        folderPath
+    );
+
+    let guard__ = state.db.lock().await;
+    let db = guard__
+        .as_ref()
+        .ok_or("No active session - please log in")?;
+    db.list_folder_tracks_recursive(&folderPath)
+        .map_err(|e| e.to_string())
+}
+
 #[tauri::command]
 pub async fn v2_library_add_folder(
     path: String,

src-tauri/src/lib.rs

@@ -1770,6 +1770,7 @@ pub fn run(qconnect_cli_override: Option<bool>) {
             commands_v2::v2_library_get_folders_with_metadata,
             commands_v2::v2_library_list_folder_children,
             commands_v2::v2_library_list_folder_tracks,
+            commands_v2::v2_library_list_folder_tracks_recursive,
             commands_v2::v2_library_add_folder,
             commands_v2::v2_library_cleanup_missing_files,
             commands_v2::v2_library_fetch_missing_artwork,