fix(playlists): modify full playlist tree when adding tracks (avoid structure-only overwrite); then reload structure for counters

packages/frontend/src/App.tsx

@@ -232,31 +232,27 @@ const RekordboxReader: React.FC = () => {
   };
 
   const handleAddSongsToPlaylist = async (songIds: string[], playlistName: string) => {
-    const updatedPlaylists = playlists.map(node => {
+    // Fetch FULL playlists to avoid losing tracks (structure view strips them)
-      if (node.name === playlistName && node.type === 'playlist') {
+    const fullTree = await api.getPlaylists();
-        return {
+
-          ...node,
+    const applyAdd = (nodes: PlaylistNode[]): PlaylistNode[] => {
-          tracks: [...new Set([...(node.tracks || []), ...songIds])]
+      return nodes.map(node => {
-        };
+        if (node.type === 'playlist' && node.name === playlistName) {
+          const current = Array.isArray(node.tracks) ? node.tracks : [];
+          const merged = Array.from(new Set([...current, ...songIds]));
+          return { ...node, tracks: merged };
         }
         if (node.type === 'folder' && node.children) {
-        return {
+          return { ...node, children: applyAdd(node.children) };
-          ...node,
-          children: node.children.map(child => {
-            if (child.name === playlistName && child.type === 'playlist') {
-              return {
-                ...child,
-                tracks: [...new Set([...(child.tracks || []), ...songIds])]
-              };
-            }
-            return child;
-          })
-        };
         }
         return node;
       });
-    await api.savePlaylists(updatedPlaylists);
+    };
-    // Always normalize state to structure for consistent counters
+
+    const updatedFullTree = applyAdd(fullTree);
+    await api.savePlaylists(updatedFullTree);
+
+    // Reload structure for UI counters
     const structure = await api.getPlaylistStructure();
     setPlaylists(structure);
   };