fix: 解决半选按钮禁用显示样式问题

src/less/base/single/button/button.half.less

@@ -12,4 +12,10 @@
     background-color: @color-bi-background-half-button-content;
     content: '';
   }
+  &,
+  .disabled {
+    &:after {
+      background-color: @color-bi-background-disabled-half-button-content;
+    }
+  }
 }

src/less/lib/theme.less

@@ -195,6 +195,7 @@
 @color-bi-split-disabled-segment: @color-bi-border-disabled;
 // 半选
 @color-bi-background-half-button-content: @color-bi-background-highlight;
+@color-bi-background-disabled-half-button-content: @color-bi-background-light-disabled;
 // items
 @color-bi-text-active-single-select-icon-text-item: @color-bi-text-highlight;
 // editor