docs: fix select code blocks in UI docs (#11010)

www/packages/docs-ui/src/components/CodeBlock/index.tsx

@@ -388,7 +388,7 @@ export const CodeBlock = ({
           >
             {({
               className: preClassName,
-              style: { backgroundColor, ...style },
+              style: { backgroundColor: _, ...style },
               tokens,
               ...rest
             }) => (

www/packages/tailwind/base.tailwind.config.js

@@ -837,13 +837,13 @@ module.exports = {
           },
           ".code-block-highlight": {
             "*::selection": {
-              "background-color": "var(--docs-contrast-fg-secondary)",
+              "background-color": "var(--docs-contrast-fg-secondary) !important",
               color: "var(--docs-contrast-bg-base)",
             },
           },
           ".code-block-highlight-light": {
             "*::selection": {
-              "background-color": "var(--docs-bg-highlight)",
+              "background-color": "var(--docs-bg-highlight) !important",
             },
           },
           ".badge": {