fix: right-click delete note no longer shows context menu

Set rightClickDragRef.erasedNote=true on delete. handleContextMenu
checks and skips menu when true.

app/static/js/app.jsx

@@ -4922,6 +4922,7 @@ const PianoRollTabEditor = ({ st, zoom, bpm, viewportWidth, onClose, onUpdateNot
         pushToUndo(notes);
         setNotes(prev => prev.filter(n => n.id !== clickedNote.id));
         setSelectedNoteIds(prev => prev.filter(id => id !== clickedNote.id));
+        rightClickDragRef.current.erasedNote = true;
         showToast('Đã xóa nốt!', 'info');
       } else {
         rightClickDragRef.current = { active: true, startX: e.clientX, startY: e.clientY };
@@ -5251,6 +5252,10 @@ const PianoRollTabEditor = ({ st, zoom, bpm, viewportWidth, onClose, onUpdateNot
 
   const handleContextMenu = (e) => {
     e.preventDefault();
+    if (rightClickDragRef.current.erasedNote) {
+      rightClickDragRef.current.erasedNote = false;
+      return;
+    }
     const pos = { x: e.clientX, y: e.clientY, parentKey: null };
     scaleMenuOriginRef.current = { x: pos.x, y: pos.y };
     setScaleMenuPos(pos);