fix(ui): set min-height on modal to prevent size jump

[cnaples79]

Summary

This PR fixes an issue where the Assistant modal "jumps" in size when it's opened, before the content is loaded. This was caused by the modal not having a defined height until the content was rendered.

Changes Made

• Added a min-height of 500px to the .assistant-modal--content class in src/components/AssistantTextProcessingModal.vue. This ensures that the modal has a consistent height from the moment it is rendered, preventing the jarring size change.

Test Plan

• I ran npm run build to ensure the code builds successfully.
• I also ran npm run lint and npm run stylelint to ensure the changes are consistent with the project's coding style.
• Manual testing:
  1. Open the assistant modal.
  2. Verify that the modal appears at its final size and does not resize when the content loads.

Fixes #370

[janepie]

Works as intended, thanks a lot!

[cnaples79]

@janepie you're welcome! happy to help.

[janepie]

Hey @cnaples79
We have a Nextcloud Talk instance where we invite Nextcloud contributors to be able to communicate more quickly, and we also have team channels for e.g. "Integrations" (incl. AI topics). If you like, I could give you a guest account via the email address in your commits?

[cnaples79]

@janepie Sure, that sounds great! I'd be happy to help contribute more.