fix: 优化自定义tabBar组件，添加错误处理

- 添加switchTab失败时的redirectTo回退
- 优化样式，添加安全区域适配

xuan-deduct-uniapp/src/components/custom-tabbar/custom-tabbar.vue

@@ -65,7 +65,13 @@ export default {
       this.currentIndex = index
       const path = this.tabList[index].pagePath
       uni.switchTab({
-        url: path
+        url: path,
+        fail: (err) => {
+          console.log('switchTab fail:', err)
+          uni.redirectTo({
+            url: path
+          })
+        }
       })
     }
   }