feat(admin): open ticket creation in a dialog on the list page

Move "代客提交工单" back into a native <dialog> on the ticket list while
the ticket workspace stays a full page. Closing asks before discarding
input, ignores backdrop clicks, resets the form and returns focus; an
uncertain create result keeps the form locked behind "重新加载".

Remove the ?view=new create page route and its styles.

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

src/Admin/Native/UsersMenusTicketsList.php

@@ -12,7 +12,7 @@ defined('ABSPATH') || exit;
 trait UsersMenusTicketsList {
 
     private function render_ticket_list_page(array $filters, int $paged): void {
-        // 先查询并夹取页码，页头「代客提交」链接才能带上实际页码。
+        // 先查询并夹取页码，创建成功后跳转的工作区链接才能带上实际页码。
         [$result, $paged] = $this->ticket_list_result($filters, $paged);
         NativeUi::header(
             __('工单管理', 'aksrt'),
@@ -21,7 +21,7 @@ trait UsersMenusTicketsList {
             [
                 [
                     'label' => __('代客提交工单', 'aksrt'),
-                    'url' => $this->ticket_page_url(['view' => 'new'] + $this->ticket_context($filters, $paged)),
+                    'dialog' => self::TICKET_CREATE_DIALOG,
                     'primary' => true,
                     'icon' => 'dashicons-plus-alt2',
                 ],
@@ -33,6 +33,7 @@ trait UsersMenusTicketsList {
             ]
         );
         $this->render_ticket_list($filters, $paged, $result);
+        $this->render_ticket_create_dialog();
     }
 
     /** 越界页码夹到末页，避免处理最后一条工单后停在空页。返回 [查询结果, 实际页码]。 */