用户中心侧栏工单中心图标改用 comment-color

- sidebar-nav: 工单中心 icon ticket-color -> comment-color
- 删除 assets/icons/sprite/ticket-color.svg 并重建 svg-icon.js
- 同步更新相关契约测试

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

tests/widget-system/ticket-schema-contract.test.cjs

@@ -155,7 +155,7 @@ test('ticket panel is registered across the user-center wiring', () => {
 
   const sidebar = read('inc/helpers/user-center-renderers/sidebar-nav.php');
   assert.ok(sidebar.includes("'label' => __('工单中心', 'aksrt')"), 'sidebar label missing');
-  assert.ok(sidebar.includes("'icon'  => 'ticket-color'"), 'sidebar icon should use the built-in ticket sprite');
+  assert.ok(sidebar.includes("'icon'  => 'comment-color'"), 'sidebar icon should use the built-in comment sprite');
   assert.ok(sidebar.includes("'tab'   => 'tickets'"), 'sidebar tab key missing');
 
   const helper = read('inc/helpers/aksrt-user-center.php');

tests/widget-system/user-center-sidebar-icons-contract.test.cjs

@@ -152,7 +152,7 @@ test('所用 sprite key 均在前端 sprite 中定义', () => {
   const sprite = read('assets/js/runtime/svg-icon.js');
   const keys = [
     'trend-color', 'user-auth', 'order-color', 'msg-color', 'user-color', 'security-color',
-    'money-color-2', 'points-color', 'merchant-color', 'money-color', 'vip_1', 'time', 'menu', 'right', 'ticket-color',
+    'money-color-2', 'points-color', 'merchant-color', 'money-color', 'vip_1', 'time', 'menu', 'right', 'comment-color',
   ];
   for (const key of keys) {
     assert.match(sprite, new RegExp(`aksrt_svgs\\['${key}'\\]\\s*=`), `sprite key missing: ${key}`);