design (AI): Improve the AI's "thinking" aesthetic

[ericpgreen2]

WIP

Closes APP-477

Checklist:

• Covered by tests
• Ran it and it works as intended
• Reviewed the diff before requesting a review
• Checked for unhandled edge cases
• Linked the issues it closes
• Checked if the docs need to be updated. If so, create a separate Linear DOCS issue
• Intend to cherry-pick into the release branch
• I'm proud of this work!

[nishantmonu51]

@ericpgreen2 : Is it ready to be reviewed?