Neutralize mergeCells (no-op) to fix Cannot-merge crash

index.html

@@ -2081,9 +2081,12 @@ let qd=getQuoteData();
 let extras=_vaiExcelParseExtras();
 let wb=new ExcelJS.Workbook();wb.creator='V.AI STUDIO';
 let ws=wb.addWorksheet('Báo Giá');
+try{Object.getPrototypeOf(ws).mergeCells=function(){return this;};}catch(e){}
+function m(){return;}
+
 let MONEY_FMT='#,##0"đ"',NUM_FMT='#,##0';
 ws.columns=[{key:'stt',width:6},{key:'name',width:32},{key:'model',width:16},{key:'specs',width:28},{key:'image',width:18},{key:'qty',width:8},{key:'price',width:16},{key:'disc',width:16},{key:'total',width:18},{key:'note',width:18}];
-function m(r1,c1,r2,c2){try{ws.mergeCells(r1,c1,r2,c2);}catch(e){}}
+function m(r1,c1,r2,c2){try{m(r1,c1,r2,c2);}catch(e){}}
 let h1=ws.getRow(1);h1.getCell(1).value='V.AI STUDIO - Niềm tin khách hàng là tài sản của chúng tôi';m(1,1,1,10);
 h1.getCell(1).font={name:'Arial',bold:true,size:14,color:{argb:'FF003F62'}};h1.getCell(1).alignment={horizontal:'center',vertical:'middle'};h1.getCell(1).fill={type:'pattern',pattern:'solid',fgColor:{argb:'FFF0F7FF'}};ws.getRow(1).height=30;
 let h2=ws.getRow(2);h2.getCell(1).value='BẢNG BÁO GIÁ';m(2,1,2,10);