Update dependency tailwindcss to v4

.gitea/workflows/renovate.yml

@@ -12,7 +12,7 @@ on:
 jobs:
   renovate:
     runs-on: ubuntu-latest
-    container: ghcr.io/renovatebot/renovate:42.68.4
+    container: ghcr.io/renovatebot/renovate:42.66.11
     steps:
       - uses: https://git.quad4.io/actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
       - name: Fetch remote configuration

frontend/package.json

@@ -36,7 +36,7 @@
 		"svelte-check": "^4.3.5",
 		"svelte-eslint-parser": "^1.4.1",
 		"svelte-i18n": "^4.0.1",
-		"tailwindcss": "^3.4.19",
+		"tailwindcss": "^4.0.0",
 		"typescript": "^5.9.3",
 		"vite": "^7.3.0"
 	}