const sleep=ms=>new Promise(r=>setTimeout(r,ms));
const nat = b => { const o={bubbles:true,cancelable:true,view:window,button:0};
  for (const t of ['pointerdown','mousedown','pointerup','mouseup','click'])
    b.dispatchEvent(new (t.startsWith('pointer')?PointerEvent:MouseEvent)(t,o)); };
for (const b of document.querySelectorAll('button'))
  if ((b.innerText||'').trim()==='取消' && b.offsetParent!==null) { nat(b); break; }
await sleep(1500);
// 把铺铜边框先删掉：反正重载会丢，留着只会让 save 弹「未保存」挡住 reload
let n=0;
for (const o of await eda.pcb_PrimitivePour.getAll()) { await eda.pcb_PrimitivePour.delete(o.primitiveId); n++; }
await eda.pcb_Document.save();
await sleep(2500);
window.onbeforeunload = null;
setTimeout(()=>location.reload(true), 400);
return {deleted:n};