Agent dashboard screenshots

[ethanpalm]

Documentation changes

This PR adds screenshots of the agent dashboard panel and settings button to help with way finding while using the agent in the dashboard.

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For Reviewers

When reviewing documentation PRs, please consider:

✅ Technical accuracy

• Code examples work as written
• Commands and configurations are correct
• Links resolve to the right destinations
• Prerequisites and requirements are accurate

✅ Clarity and completeness

• Instructions are clear and easy to follow
• Steps are in logical order
• Nothing important is missing
• Examples help illustrate the concepts

✅ User experience

• A new user could follow these docs successfully
• Common gotchas or edge cases are addressed
• Error messages or troubleshooting guidance is helpful

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Note

Adds light/dark screenshots of the agent panel and settings button and clarifies Slack setup steps in ai/agent.mdx.

• Docs (ai/agent.mdx):
  • Add light/dark screenshots of the agent panel within a Frame.
  • Refine Slack setup steps by splitting step 1 into two steps and adding light/dark screenshots of the Settings button within a Frame.

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