Bump tailwindcss from 3.4.18 to 4.1.16 in /webapp

Bumps [tailwindcss](https://github.com/tailwindlabs/tailwindcss/tree/HEAD/packages/tailwindcss) from 3.4.18 to 4.1.16.
- [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/v4.1.16/packages/tailwindcss)

---
updated-dependencies:
- dependency-name: tailwindcss
  dependency-version: 4.1.16
  dependency-type: direct:development
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

webapp/package.json

@@ -7,6 +7,6 @@
     "daisyui": "^4.0.1",
     "postcss": "^8.4.16",
     "postcss-loader": "^8.0.0",
-    "tailwindcss": "^3.1.8"
+    "tailwindcss": "^4.1.16"
   }
 }