Externalize ha-assist-chat styling

[balloob]

Breaking change

Proposed change

Move the margin out of ha-assist-chat so it can be easier embedded in other locations. Styling of assist dialog remains the same.

Will help with styling for #23682

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New feature (thank you!)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Example configuration

Additional information

• This PR fixes or closes issue: fixes #
• This PR is related to issue or discussion:
• Link to documentation pull request:

Checklist

• The code change is tested and works locally.
• There is no commented out code in this PR.
• Tests have been added to verify that the new code works.

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated for www.home-assistant.io

[balloob]

I pushed a fix. The problem was that ha-assist-chat had a min-height, dictating how it was to be used. However, it was going to be used slightly different now. Removed the min-height and moved that to the host.

[wendevlin]

The x padding added a space betweren the chat bubbles and the scrollbar. Now it sticks to the scrollbar

[balloob]

Ugh good point.

[balloob]

Fixed.