fix: descend undo notes and smooth next-level transitions

wechat-campaign-200-r2/qa/hints.html

@@ -28,7 +28,7 @@ for(const n of ['TouchStart','TouchMove','TouchEnd','TouchCancel','Hide','Show',
 const global={};
 new Function('wx','GameGlobal','requestAnimationFrame','cancelAnimationFrame','setTimeout','clearTimeout','Date',source)(wx,global,cb=>{frames.set(++frameId,cb);return frameId;},id=>frames.delete(id),()=>1,()=>{},Clock);
 const api=global.numberSwipeR2;
-const tick=(ms=16)=>{now+=ms;const entry=frames.entries().next().value;if(!entry)return;const [id,fn]=entry;frames.delete(id);fn();};tick();
+const tick=(ms=16)=>{now+=ms;const callbacks=[...frames.values()];frames.clear();for(const fn of callbacks)fn();};tick();
 const tap=(x,y)=>{const e={changedTouches:[{identifier:1,clientX:x,clientY:y}],touches:[{identifier:1,clientX:x,clientY:y}]};handlers.TouchStart(e);handlers.TouchEnd(e);tick();};
 const button=label=>{const b=api.buttons().find(b=>b.label===label);if(!b||!b.enabled)throw Error('缺少按钮 '+label);tap(b.x+b.w/2,b.y+b.h/2);};
 const cell=id=>{const s=api.snapshot(),[x,y]=s.centers[id];tap(x+s.boardRect.x,y+s.boardRect.y);};