fix: 暗色模式下面板设置按钮样式调整 (#2464)

frontend/src/styles/element-dark.scss

@@ -314,4 +314,21 @@ html.dark {
     .el-date-editor .el-range-separator {
         color: var(--panel-button-disabled);
     }
+
+    .el-input-group__append {
+        border-left: 0;
+        &:hover {
+            color: var(--el-color-primary);
+            background-color: var(--el-color-primary-light-9) !important;
+        }
+        background-color: #212426 !important;
+        border-top-left-radius: 0;
+        border-bottom-left-radius: 0;
+        box-shadow: 0 1px 0 0 var(--el-input-border-color) inset, 0 -1px 0 0 var(--el-input-border-color) inset,
+            -1px 0 0 0 var(--el-input-border-color) inset;
+    }
+
+    .el-collapse-item__header {
+        color: #ffffff;
+    }
 }