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-booking/components/ConactSection/index.vue

@@ -18,7 +18,8 @@
 
   <!-- 联系方式 -->
   <view class="bg-white rounded-[12px] overflow-hidden">
-    <view class="border-box border-bottom text-[16px] font-[500] text-[#000000] leading-[24px] p-[12px]">联系方式</view>
+    <view class="border-box border-b border-[#e5e8ee] text-[16px] font-[500] text-[#000000] leading-[24px] p-[12px]">
+      联系方式</view>
     <view class="flex items-center p-[12px]">
       <view class="text-[14px] font-[500] text-[#525866] mr-[12px]"> 联系人姓名 </view>
       <view class="right">

src/pages-booking/components/UserSection/index.vue

@@ -8,8 +8,8 @@
     </view>
 
     <view class="border-box pl-[12px] pr-[12px]">
-      <view class="border-box border-bottom pt-[12px] pb-[12px] flex items-center" v-for="(item, index) in userFormList"
-        :key="index">
+      <view class="border-box border-b border-[#e5e8ee] pt-[12px] pb-[12px] flex items-center"
+        v-for="(item, index) in userFormList" :key="index">
         <view class="text-[14px] font-[500] text-[#525866] mr-[12px]"> 住客姓名 </view>
         <view class="right">
           <input class="border-box px-[4px] py-[2px] text-[15px] text-[#000000] leading-[20px]"