fix(modal): restrict confirmText length to 4 chars and safeguard banner null access

pwuniapp/pages/user/index.vue

@@ -756,12 +756,28 @@ const showInvitePoster = () => {
   const firstRate = finRules.firstReferralPercent != null ? finRules.firstReferralPercent : 5.0;
   const secondRate = finRules.secondReferralPercent != null ? finRules.secondReferralPercent : 2.0;
   const totalRate = (Number(firstRate) + Number(secondRate)).toFixed(1);
+  const inviteCode = `PW${user.value.id || 1001}`;
 
   uni.showModal({
     title: '二级分销推广',
-    content: `您的专属邀请码为：PW${user.value.id}\n已成功邀请 ${user.value.invitedCount} 位好友！\n好友下单享受直推 ${firstRate}% + 间推 ${secondRate}%，全网自动分润最高达 ${totalRate}%！`,
-    showCancel: false,
-    confirmText: '保存推广码'
+    content: `您的专属邀请码为：${inviteCode}\n已成功邀请 ${user.value.invitedCount || 0} 位好友！\n好友下单享受直推 ${firstRate}% + 间推 ${secondRate}%，全网自动分润最高达 ${totalRate}%！`,
+    showCancel: true,
+    cancelText: '我知道了',
+    confirmText: '一键复制',
+    confirmColor: '#6366F1',
+    success: (res) => {
+      if (res.confirm) {
+        uni.setClipboardData({
+          data: inviteCode,
+          success: () => {
+            uni.showToast({
+              title: '邀请码已复制',
+              icon: 'success'
+            });
+          }
+        });
+      }
+    }
   });
 };