<!-- This is an auto-generated comment: release notes by coderabbit.ai
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## Summary by CodeRabbit
* **Style**
* Improved visual styling and cursor behavior for chat input send, stop,
and preference trigger buttons.
* Enhanced appearance and interactivity cues for the chat input
preference trigger.
* **Refactor**
* Simplified image preview grid by using CSS hover states for close
button visibility and switching to background images for previews.
* Streamlined image deletion process for a more intuitive user
experience.
* **Tests**
* Updated image upload test to wait for image container elements,
improving test reliability.
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