style: remove redundant box-border utility classes

Remove the unnecessary box-border CSS class from component template class lists across the codebase, cleaning up styling without altering any component functionality.

src/components/TopNavBar/index.vue

@@ -4,7 +4,7 @@
     <view :style="{ height: statusBarHeight + 'px' }" v-if="!hideStatusBar"></view>
 
     <!-- 导航栏内容 -->
-    <view class="flex flex-items-center flex-justify-between box-border pl-[8px] pr-[8px]" :style="navContentStyle">
+    <view class="flex flex-items-center flex-justify-between pl-[8px] pr-[8px]" :style="navContentStyle">
       <!-- 左侧返回按钮 -->
       <view class="nav-bar-left flex flex-items-center flex-justify-center" v-if="showBack" @click="handleBack">
         <uni-icons type="left" size="20" :color="backIconColor" />