fix(ticket): rework detail modal layout and restore urge

- Detail modal: fixed-height dialog, thread is the only (thin) scroll area
- Collapsible pinned summary bar (collapsed by default, state kept across re-render)
- Composer: toolbar (image / urge / close) above input, pending image tray with remove
- Paste screenshots to upload; create form uses the same button + tray
- Urge/close now POST (routes are CREATABLE); urge cooldown countdown via urge_wait
- Notify admins on urge when ticket is unassigned
- Split composer/form styles into tickets-compose.css; drop dead uploader code

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

assets/js/ticket-center-core.js

@@ -227,7 +227,10 @@
       button.disabled = full;
     });
     var count = root.querySelector('[data-aksrt-ticket-image-count]');
-    if (count) count.textContent = holder.children.length + ' / ' + attachmentMax();
+    if (count) {
+      count.textContent = holder.children.length + ' / ' + attachmentMax();
+      count.classList.toggle('is-zero', holder.children.length === 0);
+    }
   }
 
   function uploadFiles(root, files) {
@@ -311,16 +314,31 @@
     shell.addEventListener('change', function (event) {
       clearInvalid(event.target.closest('fieldset') || event.target);
     });
+    // 粘贴截图直接进入待上传区（未开启附件时表单内没有图片容器，自然跳过）。
+    shell.addEventListener('paste', function (event) {
+      var root = event.target.closest && event.target.closest('form');
+      if (!root || !imageHolder(root) || !event.clipboardData) return;
+      var files = Array.prototype.filter.call(event.clipboardData.files || [], function (file) {
+        return /^image\//.test(file.type);
+      });
+      if (!files.length) return;
+      event.preventDefault();
+      uploadFiles(root, files);
+    });
     return ctx;
   }
 
-  function uploaderHtml() {
+  // 回复框：工具栏里的「图片」按钮 + 输入框上方的待发送缩略图条（空时由 CSS :empty 收起）。
+  function attachButtonHtml() {
     if (!attachmentEnabled()) return '';
-    return '<div class="aksrt-ticket-uploader">'
-      + '<div class="aksrt-ticket-images" data-aksrt-ticket-images></div>'
-      + '<button type="button" class="aksrt-ticket-image is-add" data-aksrt-ticket-upload aria-label="添加图片">'
-      + icon('fa-plus') + '<span data-aksrt-ticket-image-count>0 / ' + attachmentMax() + '</span></button>'
-      + '</div>';
+    return '<button type="button" class="aksrt-ticket-tool" data-aksrt-ticket-upload title="添加图片，也可直接粘贴截图">'
+      + icon('fa-image') + '<span>图片</span>'
+      + '<span class="aksrt-ticket-tool__count is-zero" data-aksrt-ticket-image-count>0 / ' + attachmentMax() + '</span></button>';
+  }
+
+  function attachTrayHtml() {
+    if (!attachmentEnabled()) return '';
+    return '<div class="aksrt-ticket-tray" data-aksrt-ticket-images aria-label="待发送图片"></div>';
   }
 
   window.AksrtTicketCore = {
@@ -346,6 +364,7 @@
     collectAttachments: collectAttachments,
     isUploading: isUploading,
     bindShell: bindShell,
-    uploaderHtml: uploaderHtml,
+    attachButtonHtml: attachButtonHtml,
+    attachTrayHtml: attachTrayHtml,
   };
 })();