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>

src/components/MindSpacePageEditablePreviewFrame.tsx

@@ -130,7 +130,7 @@ export function MindSpacePageEditablePreviewFrame({
         ref={iframeRef}
         title={`${title || '页面'} 预览`}
         srcDoc={srcdoc}
-        sandbox="allow-same-origin allow-scripts"
+        sandbox="allow-scripts"
         scrolling={scrollInsideFrame ? 'yes' : 'no'}
         className={frameClassName}
         style={scrollInsideFrame ? { height: '100%' } : { height: `${height}px` }}