chore(deps): Update dependency tailwindcss to v4

Author: renovate[bot]

package.json

@@ -40,7 +40,7 @@
 		"svelte-inview": "4.0.4",
 		"svelte-markdown": "0.4.1",
 		"svelte-sitemap": "2.7.1",
-		"tailwindcss": "3.4.17",
+		"tailwindcss": "4.1.18",
 		"tslib": "2.8.1",
 		"typescript": "5.8.3",
 		"vite": "5.4.19",