refactor: standardize spacing and update RefundPopup component

- standardize margin spacing across components with explicit pixel values
- replace legacy uni-popup and icons with van-ui equivalents in RefundPopup
- update font weight class to use semantic name in date range selector

src/components/Feedback/index.vue

@@ -25,7 +25,7 @@
       </div>
 
       <div v-else class=" left flex-1 p-[12px]">
-        <div class="text-[12px] text-ink-600 leading-[20px] mb-4">
+        <div class="text-[12px] text-ink-600 leading-[20px] mb-[4px]">
           联系方式: {{ contactPhone }}
         </div>
         <div class="text-[12px] text-ink-600 leading-[20px] ellipsis-2">