refactor: tighten shadcn admin ui polish

frontend/src/features/tickets/TicketCreatePage.tsx

@@ -133,7 +133,7 @@ export function TicketCreatePage() {
                   <span>请确认标题和问题描述已足够支持技术人员开始排查。</span>
                 </div>
                 <Button type="submit" disabled={submitting}>
-                  <Send className="size-4" />
+                  <Send data-icon="inline-start" />
                   {submitting ? '提交中...' : '提交工单'}
                 </Button>
               </div>
@@ -160,7 +160,7 @@ export function TicketCreatePage() {
 
             <AppSection
               title="AI 建单辅助"
-              action={<Badge variant="ai"><Bot className="size-3" /> 即将接入</Badge>}
+              action={<Badge variant="ai">即将接入</Badge>}
             >
               <p className="text-sm text-muted-foreground">
                 后续阶段将接入建单 Agent，用于补全字段、追问缺失信息和推荐相似问题。

frontend/src/features/tickets/TicketDetailPage.tsx

@@ -124,7 +124,7 @@ export function TicketDetailPage({ ticketId }: { ticketId: number }) {
                     variant={status === 'closed' ? 'outline' : 'secondary'}
                     onClick={() => openTransition(status)}
                   >
-                    {Icon ? <Icon className="size-4" /> : null}
+                    {Icon ? <Icon data-icon="inline-start" /> : null}
                     {getStatusActionLabel(ticket.status, status)}
                   </Button>
                 )

frontend/src/features/tickets/TicketListPage.tsx

@@ -113,7 +113,7 @@ const columns: AppDataTableColumn<Ticket>[] = [
         }}
       >
         详情
-        <ArrowRight className="size-4" />
+        <ArrowRight data-icon="inline-end" />
       </Button>
     )
   }
@@ -200,7 +200,7 @@ export function TicketListPage() {
           title="工单中心"
           actions={
             <Button onClick={() => (window.location.hash = '/tickets/new')}>
-              <Plus className="size-4" />
+              <Plus data-icon="inline-start" />
               新建工单
             </Button>
           }