fix(admin): make ticket "view latest" jump reliably

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

assets/js/admin-tickets.js

@@ -126,6 +126,27 @@
     active.querySelectorAll('[data-aksrt-ticket-assign]').forEach(function (button) { button.disabled = true; });
   }
 
+  /** 会话已在底部或无需滚动时隐藏「查看最新记录」，避免点击无反应。 */
+  function syncLatest() {
+    var conversation = panel.querySelector('.aksrt-ticket-conversation__scroll');
+    var button = panel.querySelector('[data-aksrt-ticket-latest]');
+    if (!conversation || !button) return;
+    button.hidden = conversation.scrollHeight - conversation.clientHeight - conversation.scrollTop <= 8;
+  }
+
+  /** 会话内滚到底部；手动触发时同时让弹窗正文露出会话底部。 */
+  function showLatest(manual) {
+    var conversation = panel.querySelector('.aksrt-ticket-conversation__scroll');
+    if (!conversation) return;
+    conversation.scrollTop = conversation.scrollHeight;
+    if (manual) {
+      var gap = conversation.getBoundingClientRect().bottom - panel.getBoundingClientRect().bottom;
+      if (gap > 0) panel.scrollTop += gap;
+      conversation.focus({ preventScroll: true });
+    }
+    syncLatest();
+  }
+
   function updateUrl(id, page) {
     var url = new URL(window.location.href);
     if (id) url.searchParams.set('id', String(id));
@@ -180,10 +201,7 @@
       if (typeof data.list === 'string') list.innerHTML = data.list;
       updateUrl(id, data.page);
       setupForms(panel, restore);
-      if (message === strings.reply) {
-        var conversation = panel.querySelector('.aksrt-ticket-conversation__scroll');
-        if (conversation) conversation.scrollTop = conversation.scrollHeight;
-      }
+      showLatest(false);
       stale = false;
       savedDrafts = {};
       savedMessage = '';
@@ -260,11 +278,7 @@
       syncStatus(statusForm);
       statusForm.querySelector('[type="submit"]').focus();
     }
-    if (event.target.closest('[data-aksrt-ticket-latest]')) {
-      var conversation = panel.querySelector('.aksrt-ticket-conversation__scroll');
-      conversation.scrollTop = conversation.scrollHeight;
-      conversation.focus();
-    }
+    if (event.target.closest('[data-aksrt-ticket-latest]')) showLatest(true);
   });
 
   root.addEventListener('input', function (event) {
@@ -389,6 +403,9 @@
     });
   });
 
+  // scroll 不冒泡，用捕获监听会话容器。
+  panel.addEventListener('scroll', syncLatest, true);
+
   window.addEventListener('beforeunload', function (event) {
     if (!saving && !dirty()) return;
     event.preventDefault();