npm-dep: bump tailwindcss from 4.1.14 to 4.1.15 in /frontend

Bumps [tailwindcss](https://github.com/tailwindlabs/tailwindcss/tree/HEAD/packages/tailwindcss) from 4.1.14 to 4.1.15.
- [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/v4.1.15/packages/tailwindcss)

---
updated-dependencies:
- dependency-name: tailwindcss
  dependency-version: 4.1.15
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

frontend/package.json

@@ -33,7 +33,7 @@
 		"prettier-plugin-tailwindcss": "^0.7.1",
 		"svelte": "^5.41.0",
 		"svelte-check": "^4.3.3",
-		"tailwindcss": "^4.1.14",
+		"tailwindcss": "^4.1.15",
 		"tslib": "^2.8.1",
 		"typescript": "^5.9.3",
 		"typescript-eslint": "^8.46.1",

frontend/pnpm-lock.yaml

@@ -91,8 +91,8 @@ importers:
         specifier: ^4.3.3
         version: 4.3.3(picomatch@4.0.3)(svelte@5.41.0)(typescript@5.9.3)
       tailwindcss:
-        specifier: ^4.1.14
-        version: 4.1.14
+        specifier: ^4.1.15
+        version: 4.1.15
       tslib:
         specifier: ^2.8.1
         version: 2.8.1
@@ -1477,6 +1477,9 @@ packages:
   tailwindcss@4.1.14:
     resolution: {integrity: sha512-b7pCxjGO98LnxVkKjaZSDeNuljC4ueKUddjENJOADtubtdo8llTaJy7HwBMeLNSSo2N5QIAgklslK1+Ir8r6CA==}
 
+  tailwindcss@4.1.15:
+    resolution: {integrity: sha512-k2WLnWkYFkdpRv+Oby3EBXIyQC8/s1HOFMBUViwtAh6Z5uAozeUSMQlIsn/c6Q2iJzqG6aJT3wdPaRNj70iYxQ==}
+
   tapable@2.3.0:
     resolution: {integrity: sha512-g9ljZiwki/LfxmQADO3dEY1CbpmXT5Hm2fJ+QaGKwSXUylMybePR7/67YW7jOrrvjEgL1Fmz5kzyAjWVWLlucg==}
     engines: {node: '>=6'}
@@ -2806,6 +2809,8 @@ snapshots:
 
   tailwindcss@4.1.14: {}
 
+  tailwindcss@4.1.15: {}
+
   tapable@2.3.0: {}
 
   tar@7.5.1: