npm-dep: bump tailwindcss from 4.1.18 to 4.2.0 in /frontend

Bumps [tailwindcss](https://github.com/tailwindlabs/tailwindcss/tree/HEAD/packages/tailwindcss) from 4.1.18 to 4.2.0.
- [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/v4.2.0/packages/tailwindcss)

---
updated-dependencies:
- dependency-name: tailwindcss
  dependency-version: 4.2.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

frontend/package.json

@@ -33,7 +33,7 @@
 		"prettier-plugin-tailwindcss": "^0.7.2",
 		"svelte": "^5.51.3",
 		"svelte-check": "^4.4.0",
-		"tailwindcss": "^4.1.18",
+		"tailwindcss": "^4.2.0",
 		"tslib": "^2.8.1",
 		"typescript": "^5.9.3",
 		"typescript-eslint": "^8.56.0",

frontend/pnpm-lock.yaml

@@ -91,8 +91,8 @@ importers:
         specifier: ^4.4.0
         version: 4.4.0(picomatch@4.0.3)(svelte@5.51.3)(typescript@5.9.3)
       tailwindcss:
-        specifier: ^4.1.18
-        version: 4.1.18
+        specifier: ^4.2.0
+        version: 4.2.0
       tslib:
         specifier: ^2.8.1
         version: 2.8.1
@@ -1435,6 +1435,9 @@ packages:
   tailwindcss@4.1.18:
     resolution: {integrity: sha512-4+Z+0yiYyEtUVCScyfHCxOYP06L5Ne+JiHhY2IjR2KWMIWhJOYZKLSGZaP5HkZ8+bY0cxfzwDE5uOmzFXyIwxw==}
 
+  tailwindcss@4.2.0:
+    resolution: {integrity: sha512-yYzTZ4++b7fNYxFfpnberEEKu43w44aqDMNM9MHMmcKuCH7lL8jJ4yJ7LGHv7rSwiqM0nkiobF9I6cLlpS2P7Q==}
+
   tapable@2.3.0:
     resolution: {integrity: sha512-g9ljZiwki/LfxmQADO3dEY1CbpmXT5Hm2fJ+QaGKwSXUylMybePR7/67YW7jOrrvjEgL1Fmz5kzyAjWVWLlucg==}
     engines: {node: '>=6'}
@@ -2707,6 +2710,8 @@ snapshots:
 
   tailwindcss@4.1.18: {}
 
+  tailwindcss@4.2.0: {}
+
   tapable@2.3.0: {}
 
   theme-change@2.5.0: {}