ai-assisted workflow UI trigger

[lanzhenw]

What changes are proposed in this pull request?

Add a hardcoded ai-assisted workflow toolbar;
Add the text prompt for infer() call;
Allow users to add positive points

How is this patch tested? If it is not, please explain why.

Screen.Recording.2026-03-26.at.9.37.30.PM.mov

Release Notes

Is this a user-facing change that should be mentioned in the release notes?

• No. You can skip the rest of this section.
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  notes for FiftyOne users.

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if this PR is part of a larger change.)

What areas of FiftyOne does this PR affect?

• App: FiftyOne application changes
• Build: Build and test infrastructure changes
• Core: Core fiftyone Python library changes
• Documentation: FiftyOne documentation changes
• Other

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