fix(wechat): sync MindSpace pages after MP generation and redirect on 401

WeChat page delivery now triggers syncUserGeneratedPages so write_file HTML
gets page records; public share widget redirects unauthenticated owners to
WeChat OAuth instead of only showing an error.

Co-authored-by: Cursor <cursoragent@cursor.com>

mindspace-public-share-widget.test.mjs

@@ -18,6 +18,8 @@ test('injectPublicFileShareButton adds plaza entry and confirm dialog', () => {
   assert.doesNotMatch(result.html, /data-mindspace-public-share-dialog-panel"/);
   assert.match(result.html, /color:#fff !important/);
   assert.match(result.html, /apiErrorBody/);
+  assert.match(result.html, /redirectToMindSpaceLogin/);
+  assert.match(result.html, /auth\/wechat\/authorize\?intent=login/);
   assert.match(result.html, /ALREADY_PUBLISHED/);
   assert.equal(result.scriptHashes.length, 1);
 });