fix: editor preview auto-scrolls to blocks area on load

app/static/editor.js

@@ -431,7 +431,7 @@ const Studio={
    try{
      const doc=await api(`/api/sites/${siteId}/pages/${page}/editor-preview`,{...req('POST',{blocks,page_template:kind,layout_mode:layoutMode,site_design:siteDesignPreview}),signal:previewController.signal});
      if(!editorTools.shouldAcceptPreview(page,seq,pageId,previewRequest))return;
-     frame.onload=()=>Studio.highlightCanvas();frame.srcdoc=doc;$('#previewState').textContent='实时预览 · 已更新';$('#previewDot').classList.remove('loading','error');
+     frame.onload=()=>{try{frame.contentWindow.postMessage({source:'siteforge-studio-host',action:'scroll-to-blocks'},'*')}catch(e){} Studio.highlightCanvas()};frame.srcdoc=doc;$('#previewState').textContent='实时预览 · 已更新';$('#previewDot').classList.remove('loading','error');
    }catch(e){
      if(!editorTools.shouldAcceptPreview(page,seq,pageId,previewRequest)||e.name==='AbortError')return;
      $('#previewState').textContent='预览更新失败';$('#previewDot').classList.remove('loading');$('#previewDot').classList.add('error');toast('预览失败：'+e.message,true);

app/static/studio-canvas-bridge.js

@@ -142,6 +142,10 @@
   }
   window.addEventListener('message',event=>{
     if(event.source!==parent||event.data?.source!=='siteforge-studio-host')return;
+    if(event.data.action==='scroll-to-blocks'){
+      const main=document.querySelector('#main-content');
+      if(main&&main.children.length>0){main.scrollIntoView({behavior:'auto',block:'start'})}
+    }
     if(event.data.action==='highlight'&&typeof event.data.blockId==='string'){activate(event.data.blockId,false);for(const n of nested)n.classList.toggle('sf-canvas-child-selected',n.dataset.block===event.data.childId);}
   });
 })();