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/coupons.uvue

@@ -35,20 +35,20 @@ type Coupon = {
 
 const coupons = ref<Coupon[]>([])
 
-onMounted(() => {
-  loadCoupons()
-})
-
 const loadCoupons = async () => {
     uni.showLoading({ title: '加载中...' })
     try {
-        const userCoupons = await supabaseService.getUserCoupons(1) // 1: unused
-        coupons.value = userCoupons.map((item: UserCoupon) => {
+        const userCoupons = await supabaseService.getUserCoupons(1)
+        coupons.value = userCoupons.map((item: UserCoupon): Coupon => {
+            const amountVal = item.amount ?? 0
+            const expiryVal = (item.expire_at != null && item.expire_at !== '') 
+                ? item.expire_at.substring(0, 10) 
+                : '长期有效'
             return {
                 id: item.id,
-                title: item.template_name || '优惠券',
-                amount: `¥${item.amount || 0}`,
-                expiry: item.expire_at ? item.expire_at.substring(0, 10) : '长期有效'
+                title: (item.template_name != null && item.template_name !== '') ? item.template_name : '优惠券',
+                amount: `¥${amountVal}`,
+                expiry: expiryVal
             } as Coupon
         })
     } catch (e) {
@@ -59,6 +59,10 @@ const loadCoupons = async () => {
     }
 }
 
+onMounted(() => {
+  loadCoupons()
+})
+
 const useCoupon = (coupon: Coupon) => {
   uni.switchTab({
     url: '/pages/mall/consumer/index'
@@ -70,7 +74,7 @@ const useCoupon = (coupon: Coupon) => {
 .coupons-page {
   padding: 15px;
   background-color: #f5f5f5;
-  min-height: 100vh;
+  flex: 1;
 }
 
 .empty-state {