chore(deps): update tailwindcss

Author: renovate[bot]

webapp/package.json

@@ -38,9 +38,9 @@
         "svelte": "^5.23.0",
         "svelte-check": "^4.1.5",
         "svelte-sonner": "^0.3.28",
-        "tailwind-merge": "^2.6.0",
-        "tailwind-variants": "^0.3.1",
-        "tailwindcss": "^3.4.17",
+        "tailwind-merge": "^3.0.2",
+        "tailwind-variants": "^1.0.0",
+        "tailwindcss": "^4.0.15",
         "tailwindcss-animate": "^1.0.7",
         "typescript": "^5.8.2",
         "typescript-eslint": "^8.26.1",