style(CouponList): update field background color in dark mode

packages/vant/docs/markdown/changelog-v4.zh-CN.md

@@ -26,9 +26,13 @@
 
 其他：
 
+- ActionBar: 调整 `--van-action-bar-icon-text-color` 变量的默认值为 `--van-text-color`
 - Button: 默认圆角大小从 `2px` 调整为 `4px`
 - Button: 默认按钮的边框颜色调整为 `--van-gray-4`
 - Button: 调整 `font-smoothing`，默认使用粗体文字
+- Card: 调整 `--van-card-background` 变量的默认值为 `--van-background`
+- Card: 调整 `--van-card-price-color` 变量的默认值为 `--van-text-color`
+- Card: 调整 `--van-card-desc-color` 变量的默认值为 `--van-text-color-2`
 - Field: 调整 `--van-field-label-color` 变量的默认值为 `--van-text-color`
 - Tabbar: 调整 `--van-tabbar-item-text-color` 变量的默认值为 `--van-text-color`
 - GridItem: 调整 `--van-grid-item-text-color` 变量的默认值为 `--van-text-color`

packages/vant/src/action-bar-icon/index.less

@@ -5,7 +5,7 @@ body {
   --van-action-bar-icon-size: 18px;
   --van-action-bar-icon-font-size: var(--van-font-size-xs);
   --van-action-bar-icon-active-color: var(--van-active-color);
-  --van-action-bar-icon-text-color: var(--van-gray-7);
+  --van-action-bar-icon-text-color: var(--van-text-color);
   --van-action-bar-icon-background: var(--van-background-2);
 }
 

packages/vant/src/coupon-list/index.less

@@ -21,7 +21,7 @@ body {
       height: 34px;
       padding-left: var(--van-padding-sm);
       line-height: 34px;
-      background: var(--van-gray-1);
+      background: var(--van-background);
       border-radius: 17px;
 
       &::placeholder {