refactor: replace flex-full with flex-1 and standardize scrollbar styles

- replace all outdated flex-full utility classes with modern flex-1 across Vue components
- standardize scrollbar hiding by using scrollbar-none utility instead of verbose vendor prefixes
- update order detail page layout and scroll container styling
- add scrollbar-none usage guidelines to AGENTS.md documentation

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

@@ -1,7 +1,7 @@
 <template>
   <div class="bg-white rounded-[12px] overflow-hidden mb-[12px]">
     <div class="flex flex-items-center  p-[12px] border-bottom">
-      <div class="text-[16px] font-medium text-black leading-[24px] flex-full">
+      <div class="text-[16px] font-medium text-black leading-[24px] flex-1">
         入住信息
       </div>
       <div class="right">