Add smart ACK provider for WeChat MP replies

Replace fixed ackText with a rule-based AckProvider that picks
response templates by message type and intent (translate, summary,
rewrite, poster, ppt, mindmap, code, search, schedule). Pure sync,
zero I/O, auto-falls back to config.ackText on any error.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

plaza-embed.mjs

@@ -15,6 +15,10 @@ export function publishedPageCspForEmbed(isFullHtml) {
   return "default-src 'none'; style-src 'unsafe-inline'; img-src data:; font-src 'none'; base-uri 'none'; form-action 'self'; frame-ancestors *; script-src 'unsafe-inline'";
 }
 
+export function allowPlazaEmbedFrame(res) {
+  res.removeHeader?.('X-Frame-Options');
+}
+
 const EMBED_BOOTSTRAP = `<script id="plaza-embed-bootstrap">(function(){
   if(window.parent===window)return;
   var d=document;
@@ -24,22 +28,40 @@ const EMBED_BOOTSTRAP = `<script id="plaza-embed-bootstrap">(function(){
     d.querySelectorAll('.section,.quote-section').forEach(function(el){out.push(el);});
     var foot=d.querySelector('.footer');
     if(foot)out.push(foot);
-    return out.length?out:[d.body];
+    return out.length?out:[d.body||d.documentElement];
   }
   function fullHeight(){
-    var body=d.body;
+    var body=d.body,root=d.documentElement;
     var measured=0;
+    var scrollTop=window.pageYOffset||(root?root.scrollTop:0)||(body?body.scrollTop:0)||0;
+    function bottomOf(el){
+      if(!el)return 0;
+      var rect=el.getBoundingClientRect();
+      return rect.bottom+scrollTop;
+    }
     var els=blocks();
     for(var i=0;i<els.length;i++){
-      var el=els[i];
-      measured=Math.max(measured,el.offsetTop+el.offsetHeight);
+      if(!els[i])continue;
+      measured=Math.max(measured,bottomOf(els[i]),els[i].offsetTop+els[i].offsetHeight);
+    }
+    if(body){
+      for(var j=0;j<body.children.length;j++){
+        measured=Math.max(measured,bottomOf(body.children[j]));
+      }
     }
     if(body&&body.lastElementChild){
       var last=body.lastElementChild;
-      measured=Math.max(measured,last.offsetTop+last.offsetHeight);
+      measured=Math.max(measured,bottomOf(last),last.offsetTop+last.offsetHeight);
     }
-    measured=Math.max(measured,d.documentElement.scrollHeight,body?body.scrollHeight:0,420);
-    return Math.min(measured,16000);
+    measured=Math.max(
+      measured,
+      root?root.scrollHeight:0,
+      root?root.offsetHeight:0,
+      body?body.scrollHeight:0,
+      body?body.offsetHeight:0,
+      420
+    );
+    return Math.ceil(measured);
   }
   function restoreBlock(block){
     if(!block)return;
@@ -57,11 +79,20 @@ const EMBED_BOOTSTRAP = `<script id="plaza-embed-bootstrap">(function(){
   }
   function reportHeight(){
     var b=blocks();
-    window.parent.postMessage({
+    var h=fullHeight();
+    window.name='plaza-height:'+h;
+    var payload={
       type:'plaza:embed-section',
       count:b.length,
-      height:fullHeight(),
+      height:h,
       total:b.length
+    };
+    window.parent.postMessage(JSON.stringify(payload),'*');
+    window.parent.postMessage({
+      type:'plaza:embed-section',
+      count:payload.count,
+      height:h,
+      total:payload.total
     },'*');
   }
   function showAll(){
@@ -74,7 +105,7 @@ const EMBED_BOOTSTRAP = `<script id="plaza-embed-bootstrap">(function(){
     reportHeight();
   }
   var style=d.createElement('style');
-  style.textContent='html,body{overflow:hidden!important;margin:0}';
+  style.textContent='html,body{margin:0;overflow:hidden!important}';
   d.head.appendChild(style);
   function scheduleReport(){
     showAll();
@@ -90,11 +121,47 @@ const EMBED_BOOTSTRAP = `<script id="plaza-embed-bootstrap">(function(){
     scheduleReport();
   }
   window.addEventListener('load',function(){scheduleReport();});
-  new ResizeObserver(function(){reportHeight();}).observe(d.documentElement);
+  window.parent&&window.parent.postMessage({
+    type:'plaza:embed-ready',
+    count:1,
+    ready:true,
+    height:fullHeight(),
+    total:1
+  },'*');
+  window.addEventListener('message',function(event){
+    var data=event&&event.data;
+    if(data==='plaza:embed-measure') {
+      scheduleReport();
+      return;
+    }
+    if(data&&typeof data==='object'&&data.type==='plaza:embed-measure')scheduleReport();
+  });
+  if(typeof ResizeObserver!=='undefined'){
+    var ro=new ResizeObserver(function(){reportHeight();});
+    ro.observe(d.documentElement);
+    if(d.body)ro.observe(d.body);
+  }
+  if(typeof MutationObserver!=='undefined'){
+    new MutationObserver(function(){scheduleReport();}).observe(d.documentElement,{childList:true,subtree:true,attributes:true});
+  }
+  d.querySelectorAll('img,video,iframe').forEach(function(el){
+    el.addEventListener('load',scheduleReport);
+    el.addEventListener('error',scheduleReport);
+  });
+  [100,350,700,1400,2600,5200,9200,15000].forEach(function(delay){setTimeout(scheduleReport,delay);});
+  [120,400,1000,2000,4000,8000,12000].forEach(function(delay){setTimeout(scheduleReport,delay);});
+  var keepalive=0;
+  var keepaliveTimer=setInterval(function(){
+    keepalive+=1;
+    scheduleReport();
+    if(keepalive>=30)clearInterval(keepaliveTimer);
+  },1000);
+  window.addEventListener('pageshow',scheduleReport);
+  window.addEventListener('orientationchange',function(){setTimeout(scheduleReport,300);});
 })();</script>`;
 
 const EMBED_LAYOUT_OVERRIDES =
-  '<style id="plaza-embed-overrides">.section,.quote-section,.footer{content-visibility:visible!important;contain-intrinsic-size:auto!important}</style>';
+  '<style id="plaza-embed-overrides">.section,.quote-section,.footer{content-visibility:visible!important;contain-intrinsic-size:auto!important}.hero{height:auto!important;min-height:0!important;max-height:none!important;overflow:visible!important}</style>';
 
 /** Remove inline CSP meta tags that block plaza-embed-bootstrap (HTTP CSP header applies instead). */
 export function stripPublicationHtmlCspMeta(html) {