feat: add @docsearch/css (#217)

[skip ci]

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

- **Chores**
- Added `@docsearch/css` dependency to improve documentation search
capabilities.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

package.json

@@ -18427,6 +18427,9 @@
     "suimi-fonts": {
       "version": "*"
     },
+    "@docsearch/css": {
+      "version": "*"
+    },
     "ufo": {
       "version": "*"
     },