fix(ai): stop false WP AI priority and harden summary-suggest

Prefer configured theme OpenAI provider over incomplete WP AI Client stubs,
return clearer status codes/messages for summary generation, and improve
block-editor content collection for AI 摘要 on post-new.

assets/js/admin-ai-seo.js

@@ -78,8 +78,7 @@
 
   function getEditorContent() {
     var content = '';
-    var ta = document.getElementById('content');
-    if (ta && ta.value) content = ta.value;
+    // Block editor first (post-new.php uses Gutenberg).
     try {
       if (window.wp && wp.data && wp.data.select) {
         var ed = wp.data.select('core/editor');
@@ -89,10 +88,27 @@
         }
       }
     } catch (e) { /* ignore */ }
-    // Strip tags for length check / API
+
+    if (!content) {
+      var ta = document.getElementById('content');
+      if (ta && ta.value) content = ta.value;
+    }
+
+    // TinyMCE classic.
+    try {
+      if (!content && window.tinymce && tinymce.get) {
+        var editor = tinymce.get('content');
+        if (editor && editor.getContent) {
+          content = editor.getContent({ format: 'text' }) || editor.getContent() || '';
+        }
+      }
+    } catch (e2) { /* ignore */ }
+
+    // Strip tags for API plain-text summary.
     var div = document.createElement('div');
     div.innerHTML = content || '';
-    return (div.textContent || div.innerText || content || '').trim();
+    var plain = (div.textContent || div.innerText || content || '').replace(/\u00a0/g, ' ').trim();
+    return plain;
   }
 
   function setExcerptValue(summary) {
@@ -238,23 +254,34 @@
       .then(function (res) {
         setLoading(sumBtn, false, sumOriginal);
         if (!res.ok || !res.json || res.json.success === false) {
+          var j = res.json || {};
           var msg =
-            (res.json && (res.json.message || (res.json.data && res.json.data.message))) ||
+            j.message ||
+            (j.data && (j.data.message || (Array.isArray(j.data) && j.data[0] && j.data[0].message))) ||
             I18N.failed ||
             '生成失败';
+          if (res.status === 401 || res.status === 403) {
+            msg = I18N.needLogin || '登录已失效或权限不足，请刷新页面后重试';
+          }
           notify(sumBtn, msg, 'error');
           return;
         }
-        var summary = (res.json.data && res.json.data.summary) || '';
+        var payload = res.json.data || {};
+        var summary = payload.summary || (payload.data && payload.data.summary) || '';
+        if (!summary) {
+          notify(sumBtn, I18N.failed || '生成失败：返回摘要为空', 'error');
+          return;
+        }
         if (!setExcerptValue(summary)) {
           notify(sumBtn, I18N.noExcerptField || '未找到摘要字段，请展开「摘要」面板', 'error');
           return;
         }
         notify(sumBtn, I18N.summarySuccess || '已填入摘要字段，请检查后更新保存', 'ok');
       })
-      .catch(function () {
+      .catch(function (err) {
         setLoading(sumBtn, false, sumOriginal);
-        notify(sumBtn, I18N.failed || '生成失败', 'error');
+        notify(sumBtn, (err && err.message) || I18N.failed || '生成失败', 'error');
       });
+
   });
 })();