build(deps): bump tailwindcss from 4.1.12 to 4.1.18

Bumps [tailwindcss](https://github.com/tailwindlabs/tailwindcss/tree/HEAD/packages/tailwindcss) from 4.1.12 to 4.1.18.
- [Release notes](https://github.com/tailwindlabs/tailwindcss/releases)
- [Changelog](https://github.com/tailwindlabs/tailwindcss/blob/main/CHANGELOG.md)
- [Commits](https://github.com/tailwindlabs/tailwindcss/commits/v4.1.18/packages/tailwindcss)

---
updated-dependencies:
- dependency-name: tailwindcss
  dependency-version: 4.1.18
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

package-lock.json

@@ -31,7 +31,7 @@
     "remark-toc": "^9.0.0",
     "satori": "^0.18.2",
     "sharp": "^0.34.4",
-    "tailwindcss": "^4.1.12"
+    "tailwindcss": "^4.1.18"
   },
   "devDependencies": {
     "@astrojs/check": "^0.9.5",