feat: 添加预算类别名称更新功能，优化相关控制器逻辑

Web/src/components/Bill/BillForm.vue

@@ -90,7 +90,7 @@
     />
 
     <!-- 日期选择弹窗 -->
-    <van-popup v-model:show="showDatePicker" position="bottom" round>
+    <van-popup v-model:show="showDatePicker" position="bottom" round teleport="body">
       <van-date-picker
         v-model="currentDate"
         title="选择日期"
@@ -100,7 +100,7 @@
     </van-popup>
 
     <!-- 时间选择弹窗 -->
-    <van-popup v-model:show="showTimePicker" position="bottom" round>
+    <van-popup v-model:show="showTimePicker" position="bottom" round teleport="body">
       <van-time-picker
         v-model="currentTime"
         title="选择时间"

Web/src/components/Budget/BudgetEditPopup.vue

@@ -72,7 +72,7 @@
       </van-form>
     </div>
     <template #footer>
-        <van-button block type="primary" @click="onSubmit">保存预算</van-button>
+        <van-button block round type="primary" @click="onSubmit">保存预算</van-button>
     </template>
   </PopupContainer>
 </template>

Web/src/components/PopupContainer.vue

@@ -6,6 +6,7 @@
     :style="{ height: height }"
     round
     :closeable="closeable"
+    teleport="body"
   >
     <div class="popup-container">
       <!-- 头部区域 -->