refactor: replace border-box with box-border and clean up unused scss

Remove the unused box-sizing.scss stylesheet and its import from the main SCSS index file.
Update all Vue component template class references from the custom border-box class to the
native box-border utility class to eliminate redundant custom CSS and align with the project's
utility class conventions.

src/pages-quick/list.vue

@@ -8,7 +8,7 @@
 
       <!-- 选择入住、离店日期 0:是酒店 -->
       <view v-if="didSelectedTabItem && didSelectedTabItem.orderType == 0"
-        class="bg-white border-box flex flex-items-center p-[12px]">
+        class="bg-white box-border flex flex-items-center p-[12px]">
         <view class="in flex flex-items-center">
           <text class="font-size-11 font-500 color-99A0AE mr-4">入住</text>
           <text class="font-size-14 font-500 color-171717">
@@ -17,7 +17,7 @@
         </view>
 
         <!-- 几晚 -->
-        <text class="nights bg-[#e5e8ee] border-box font-size-11 font-500 color-525866 rounded-50 ml-8 mr-8">
+        <text class="nights bg-[#e5e8ee] box-border font-size-11 font-500 color-525866 rounded-50 ml-8 mr-8">
           {{ selectedDate.totalDays }}晚
         </text>