fix(ui): models and slide-overs to use the same Close (x) icon button styles

[gianpaj]

Changes

models and slide-overs to use the same Close (x) icon button styles

Issues

the buttons either didn't seem clickable because of the cursor pointer or because the background doesn't chage

• Fixes

Category

• Bug fix

Preview

AI Assistance

• AI was NOT used to create this PR
• AI was used (please describe below)

Testing

I check the css classes locally

Contributor Agreement

Important

• I have read and understood the contributor guidelines. If I have failed to follow any guideline, I understand that this PR may be closed without review.
• I have searched existing issues and pull requests (including closed ones) to ensure this isn't a duplicate.
• I have tested all the changes thoroughly with a local development instance of Coolify and I am confident that they will work as expected when a maintainer tests them.