fix(modal): add missing scrolling behavior for better user experience…

[JanThiel]

Changes

This PR introduces the ability to scroll the content slot of Dialogs.
If a dialog grows bigger than the screen height it currently is impossible to reach the parts that are outside of the viewport.

This fix is essential to allow #9646 to work on Laptop Screens like a Macbook Pro M4.

Issues

• Fixes [Bug]: Dialog UI does not allow scrolling when available screen height is not enough for content #9618

Category

• Bug fix
• Improvement
• New feature
• Adding new one click service
• Fixing or updating existing one click service

Preview

This animated GIF shows the new Hetzner Create Server Dialog on a Mac Book Pro with the ability to scroll the content of the Dialog. Tested on Chrome and Safari.

AI Assistance

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

If AI was used:

• Tools used: Codex with GPT-5.4 "High" Reasoning on an OpenAI "Plus" paid account with exclusion of data usage enabled for trainings.
• How extensively:
  • Codex was used to identify the issue with the missing scrolling ability and provide a fix.

All code written by AI was manually reviewed and locally tested using PHPStorm.

Testing

• Open any dialog (current "Hetzner Create Server" works fine)
• Reduce the window size manually so that the dialog is higher than the window
• Now you can scroll the content and reach even the parts outside of the viewport
• Tested with Chrome on Mac & Windows and Safari on Mac

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.

[Copilot]

Pull request overview

Adds scrollability to the modal-input dialog content so large dialogs remain usable on smaller viewport heights (fixing inability to reach overflowing content, e.g. Hetzner create-server dialog on laptop screens).

Changes:

• Make the modal viewport (fixed inset-0) scrollable.
• Constrain modal height and introduce an internal scroll area for the slot content.
• Adjust layout wrapper to support top-aligned dialogs on small screens and centered dialogs on larger screens.