Improve highlighting of active step

[lkiesow]

This patch causes active steps in wizards to be better highlighted.

I always found the slight size difference while using the same colors, font, … a bit less than I would want from an indicator.

opencast-admin-interface-wizard-active-step.mp4

Old and new style in action

[github-actions]

Use docker or podman to test this pull request locally.

Run test server using develop.opencast.org as backend:

podman run --rm -it -p 127.0.0.1:3000:3000 ghcr.io/opencast/opencast-admin-interface:pr-836

Specify a different backend like stable.opencast.org:

podman run --rm -it -p 127.0.0.1:3000:3000 -e PROXY_TARGET=https://stable.opencast.org ghcr.io/opencast/opencast-admin-interface:pr-836

It may take a few seconds for the interface to spin up.
It will then be available at http://127.0.0.1:3000.
For more options you can pass on to the proxy, take a look at the README.md.

[github-actions]

This pull request is deployed at test.admin-interface.opencast.org/836/2024-07-12_17-13-49/ .
It might take a few minutes for it to become available.

[Arnei]

Looks reasonable to me.