Update dependency tailwindcss to v4

.gitea/workflows/ci.yml

@@ -16,7 +16,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: https://git.quad4.io/actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
+        uses: https://git.quad4.io/actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4.3.1
 
       - name: Setup Go
         uses: https://git.quad4.io/actions/setup-go@40f1582b2485089dde7abd97c1529aa768e1baff # v5.6.0

.gitea/workflows/publish.yml

@@ -16,7 +16,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: https://git.quad4.io/actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6
+        uses: https://git.quad4.io/actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
 
       - name: Setup Go
         uses: https://git.quad4.io/actions/setup-go@40f1582b2485089dde7abd97c1529aa768e1baff # v5

.gitea/workflows/renovate.yml

@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-latest
     container: ghcr.io/renovatebot/renovate:42.66.11
     steps:
-      - uses: https://git.quad4.io/actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6
+      - uses: https://git.quad4.io/actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
       - name: Fetch remote configuration
         run: curl -sL https://git.quad4.io/Quad4-Extra/renovate-config/raw/branch/master/config.js -o config.js
       - run: renovate

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"
 	}