style(admin): platform order tools buttons use btn components

resources/views/admin/platform_orders/index.blade.php

@@ -623,7 +623,7 @@
             <span>包含原始 meta(JSON)（用于排障）</span>
         </label>
 
-        <button type="submit">导出当前筛选结果（CSV）</button>
+        <button class="btn btn-secondary btn-sm" type="submit">导出当前筛选结果（CSV）</button>
     </form>
 
     <form method="post" action="/admin/platform-orders/batch-activate-subscriptions" onsubmit="return confirm('确认批量同步当前筛选范围内“可同步”的订单？（仅处理：已支付+已生效+未同步）');" class="mb-10">
@@ -658,7 +658,7 @@
         </label>
 
         <div class="muted mb-8">提示：建议先勾选筛选条件「只看可同步」，再执行批量同步。</div>
-        <button type="submit">批量同步订阅（当前筛选范围）</button>
+        <button class="btn btn-sm" type="submit">批量同步订阅（当前筛选范围）</button>
     </form>
 
     <form method="post" action="/admin/platform-orders/batch-activate-subscriptions" onsubmit="return confirm('确认对全部订单执行批量同步？该操作仍只处理“已支付+已生效+未同步”的订单，但范围可能很大。');" class="mb-10">
@@ -695,7 +695,7 @@
             <input type="number" name="limit" value="50" min="1" max="500" class="w-90">
             <span>条（安全阀）</span>
         </label>
-        <button type="submit">批量同步订阅（全部订单）</button>
+        <button class="btn btn-sm" type="submit">批量同步订阅（全部订单）</button>
     </form>
 
     <form method="post" action="/admin/platform-orders/batch-mark-paid-and-activate" onsubmit="return confirm('确认批量将当前筛选范围内“待处理+未支付”的订单标记为已支付并生效，并同步订阅？（会补回执留痕；遇到退款/回执不一致会安全阀阻断并记录失败原因）');" class="mb-10">