Bump tailwindcss from 3.4.14 to 3.4.15 in /frontend

Bumps [tailwindcss](https://github.com/tailwindlabs/tailwindcss) from 3.4.14 to 3.4.15.
- [Release notes](https://github.com/tailwindlabs/tailwindcss/releases)
- [Changelog](https://github.com/tailwindlabs/tailwindcss/blob/v3.4.15/CHANGELOG.md)
- [Commits](tailwindlabs/tailwindcss@v3.4.14...v3.4.15)

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

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

frontend/package.json

@@ -24,7 +24,7 @@
     "nanoid": "^5.0.7",
     "svelte": "^5.1.0",
     "sweetalert2": "^11.12.3",
-    "tailwindcss": "^3.4.6"
+    "tailwindcss": "^3.4.15"
   },
   "author": "KJHJason"
 }