孕期首页过渡：过预产期询问避让首页引导、弹窗、底部弹层

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

js/birth-flow.js

@@ -214,8 +214,14 @@
     if (over < 1) return;
     var today = iso(new Date());
     try { if (!DEMO && localStorage.getItem(ASK_KEY) === today) return; localStorage.setItem(ASK_KEY, today); } catch (e) {}
-    /* 等首页先渲染、开屏引导之类的弹层先走，再问 */
-    setTimeout(function () { if (!ov.classList.contains('on')) askSheet(over); }, 2500);
+    /* 等首页先渲染；首页使用引导、弹窗、底部弹层开着就再等等，别叠在一起 */
+    var tries = 0;
+    function wait() {
+      var busy = $('.mb-coach.show') || $('.modal.show') || $('#sheet.show') || document.hidden;
+      if (busy && ++tries < 90) return setTimeout(wait, 2000);
+      if (!ov.classList.contains('on')) askSheet(over);
+    }
+    setTimeout(wait, 2500);
   }
 
   function apply(pg, pf) {