build(deps-dev): bump tailwindcss from 4.1.14 to 4.1.15 (#3772)

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
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

packages/frontend/package.json

@@ -43,7 +43,7 @@
     "svelte-select": "^5.8.3",
     "svelte-markdown": "^0.4.1",
     "svelte-preprocess": "^6.0.3",
-    "tailwindcss": "^4.1.14",
+    "tailwindcss": "^4.1.15",
     "vitest": "^3.0.5"
   }
 }