consumerm模块完成度90%，完善消费者和商家端数据库表，商品、聊天、订单数据对接好了supabase，和商家端对接了聊天功能，安卓端编译通过了css样式，剩余几个页面在处理函数规范问题

pages/mall/consumer/red-packets/index.uvue

@@ -1,6 +1,6 @@
 <template>
   <view class="red-packets-page">
-    <view class="tab-header">
+    <view class="tab-header" style="position: fixed; top: 0; left: 0; right: 0; z-index: 10;">
       <text 
         class="tab-item" 
         :class="{ active: currentTab === 0 }" 
@@ -82,19 +82,19 @@ const loadData = async () => {
             let createdAt = ''
             
             if (item instanceof UTSJSONObject) {
-                id = item.getString('id') || ''
-                amount = item.getNumber('amount') || 0
-                name = item.getString('name') || ''
-                status = item.getNumber('status') || 0
-                expireAt = item.getString('expire_at') || ''
-                createdAt = item.getString('created_at') || ''
+                id = item.getString('id') ?? ''
+                amount = item.getNumber('amount') ?? 0
+                name = item.getString('name') ?? ''
+                status = item.getNumber('status') ?? 0
+                expireAt = item.getString('expire_at') ?? ''
+                createdAt = item.getString('created_at') ?? ''
             } else {
-                 id = (item['id'] as string) || ''
-                 amount = (item['amount'] as number) || 0
-                 name = (item['name'] as string) || ''
-                 status = (item['status'] as number) || 0
-                 expireAt = (item['expire_at'] as string) || ''
-                 createdAt = (item['created_at'] as string) || ''
+                 id = (item['id'] as string) ?? ''
+                 amount = (item['amount'] as number) ?? 0
+                 name = (item['name'] as string) ?? ''
+                 status = (item['status'] as number) ?? 0
+                 expireAt = (item['expire_at'] as string) ?? ''
+                 createdAt = (item['created_at'] as string) ?? ''
             }
 
             return {
@@ -127,7 +127,7 @@ const getStatusText = (status: number): string => {
 }
 
 const formatTime = (timeStr: string): string => {
-  if (!timeStr) return '永久有效'
+  if (timeStr == '') return '永久有效'
   const date = new Date(timeStr)
   return `${date.getFullYear()}-${(date.getMonth() + 1).toString().padStart(2, '0')}-${date.getDate().toString().padStart(2, '0')}`
 }
@@ -136,18 +136,14 @@ const formatTime = (timeStr: string): string => {
 <style>
 .red-packets-page {
   background-color: #f5f5f5;
-  min-height: 100vh;
-  display: flex;
-  flex-direction: column;
+  flex: 1;
 }
 
 .tab-header {
   display: flex;
   background-color: #fff;
   padding: 10px 0;
-  position: sticky;
-  top: 0;
-  z-index: 10;
+  /* position: sticky is removed in flavor of inline fixed style */
 }
 
 .tab-item {