refactor: remove unused border.scss and update styles

Remove the deprecated border.scss stylesheet and its import from the main SCSS entry file. Replace all legacy border utility class usages with explicit border classes:
- Replace border-ff with border border-white
- Replace border-F1F5F9 with border border-[#f1f5f9]
- Replace border-bottom with border-b border-[#e5e8ee]
- Replace border-top-8 with border-t-8 border-[#f5f5f5]
- Update border-none button styles to add after:!hidden to retain original pseudo-element hiding behavior

src/pages-order/order/components/FooterSection/index.vue

@@ -1,12 +1,12 @@
 <template>
   <view class="footer bg-white flex items-center justify-between p-[12px]">
     <button v-if="['1', '2'].includes(statusCode)"
-      class="left border-none bg-white rounded-[10px] flex items-center justify-center text-[14px] font-[500] text-[#525866] mr-[12px]"
+      class="left border-none after:!hidden bg-white rounded-[10px] flex items-center justify-center text-[14px] font-[500] text-[#525866] mr-[12px]"
       @click="emit('refund', orderData)">
       申请退款
     </button>
     <button :class="[
-      'right border-none rounded-[10px] flex flex-1 items-center justify-center text-[14px] font-[500] bg-[#0CCD58]',
+      'right border-none after:!hidden rounded-[10px] flex flex-1 items-center justify-center text-[14px] font-[500] bg-[#0CCD58]',
       {
         'bg-[#ff3d60]': statusCode === '0',
         'text-white': ['1', '2', '3', '4', '5', '6'].includes(statusCode),