fix(comments): open the action dropdown with theme-owned delegation

The comment three-dot menu relied on the legacy data-toggle=dropdown
delegation living in comment-move-form.js; when that bundle chain does
not evaluate (stale cache or an earlier top-level error), the menu
appears dead. Move the comment action dropdown to its own top-level
document delegation in comments.js (data-aksrt-comment-drop), keep the
.open-driven CSS contract including the mobile drop-fixed-sm sheet,
sync aria-expanded, close on outside click / Escape / menu item click,
and stay idempotent for AJAX-injected comments.

assets/js/core/comments.js

@@ -616,6 +616,51 @@
     });
   }
 
+  /* ====== 评论操作三点下拉（主题自有交互，替代 vendor data-toggle 遗留委托） ======
+   * 一次性文档级委托：AJAX 注入的新评论无需重绑；
+   * open 类驱动的 .dropdown-menu 显隐 CSS 契约（含移动端 drop-fixed-sm 底部抽屉）保持不变。 */
+  function closeAllCommentDropdowns() {
+    document.querySelectorAll("#postcomments .dropdown.open").forEach(function (wrap) {
+      wrap.classList.remove("open");
+      var trigger = wrap.querySelector("[data-aksrt-comment-drop]");
+      if (trigger) trigger.setAttribute("aria-expanded", "false");
+    });
+  }
+
+  function initCommentActionDropdowns() {
+    if (document.documentElement.dataset.aksrtCommentDropBound === "1") return;
+    document.documentElement.dataset.aksrtCommentDropBound = "1";
+
+    document.addEventListener("click", function (event) {
+      var trigger = event.target.closest ? event.target.closest("[data-aksrt-comment-drop]") : null;
+      if (trigger) {
+        event.preventDefault();
+        var wrap = trigger.closest(".dropdown");
+        if (!wrap) return;
+        var wasOpen = wrap.classList.contains("open");
+        closeAllCommentDropdowns();
+        if (!wasOpen) {
+          wrap.classList.add("open");
+          trigger.setAttribute("aria-expanded", "true");
+        }
+        return;
+      }
+      // 点击菜单项（举报/置顶/编辑/批准/删除）后收起菜单。
+      var menuItem = event.target.closest ? event.target.closest("#postcomments .dropdown.open .dropdown-menu a") : null;
+      if (menuItem) {
+        closeAllCommentDropdowns();
+        return;
+      }
+      if (!event.target.closest || !event.target.closest("#postcomments .dropdown.open")) {
+        closeAllCommentDropdowns();
+      }
+    });
+
+    document.addEventListener("keydown", function (event) {
+      if (event.key === "Escape") closeAllCommentDropdowns();
+    });
+  }
+
   function init() {
     stripCommentUrlParams();
     initCommentSystem();
@@ -623,6 +668,10 @@
     initCommentOrder();
   }
 
+  // 顶层立即绑定：纯文档级委托，不依赖 DOM 就绪与 init() 是否成功；
+  // 保证即使同文件后续初始化在异常环境中中断，三点菜单仍可开合。
+  initCommentActionDropdowns();
+
   if (document.readyState === "loading") {
     document.addEventListener("DOMContentLoaded", init);
   } else {