feat (AI): UI for sharing AI conversations

[ericpgreen2]

Follows the Platform support, closes APP-643

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!

[AdityaHegde]

The share button feels like out of place in full page chat. Can we move it closer to the center perhaps?

[AdityaHegde]

nit: lets move the tests just below mocks. It reads better IMO, tests 1st then all the utils and constants.

[ericpgreen2]

We have setup-before-tests through our codebase. Mind if we just keep as is? Something feels weird about putting constants near the bottom of the file.

[AdityaHegde]

Hmmm its a separate conversation I guess. It doesnt help to read constants without knowing what the tests are doing.

[ericpgreen2]

The share button feels like out of place in full page chat. Can we move it closer to the center perhaps?

Restating our Slack convo:

• For the full-page chat when a conversation has not yet been started— I agree this is off. I've removed the button from this view.
• For the full-page chat when a conversation is ongoing— per @Di7design's advice, I've kept the button in the far right.

[AdityaHegde]

Looks good now. Just make sure the diffs for color changes match our new design system.