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- replace all outdated flex-full utility classes with modern flex-1 across Vue components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/components/Feedback/index.vue

@@ -25,7 +25,7 @@
         </div>
       </div>
 
-      <div v-else class=" left flex-full p-[12px]">
+      <div v-else class=" left flex-1 p-[12px]">
         <div class="text-[12px] text-ink-600 leading-[20px] mb-4">
           联系方式: {{ contactPhone }}
         </div>