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- replace all outdated flex-full utility classes with modern flex-1 across Vue components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/home/components/SharedVisual/ActionRow.vue

@@ -6,7 +6,7 @@
       :class="toneClass">
       <slot name="icon">{{ icon }}</slot>
     </div>
-    <div class="visual-action-row__body flex-full">
+    <div class="visual-action-row__body flex-1">
       <div class="visual-action-row__title color-1E293B text-[14px] font-900 truncate">{{ title }}</div>
       <div v-if="subtitle" class="visual-action-row__subtitle truncate">
         {{ subtitle }}