feat: add sample prompt buttons to chat interface

[dcramer]

• Add quick action buttons above chat input for common prompts
• Support "Get Organizations" and "React SDK Usage" sample queries
• Add onSendPrompt callback to programmatically send messages
• Update chat UI to show buttons when onSendPrompt handler is provided

🤖 Generated with Claude Code

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 64.12%. Comparing base (bc7c87e) to head (af7b44f).
Report is 1 commits behind head on main.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #322   +/-   ##
=======================================
  Coverage   64.12%   64.12%           
=======================================
  Files          46       46           
  Lines        5609     5609           
  Branches      471      471           
=======================================
  Hits         3597     3597           
  Misses       2012     2012           

Flag	Coverage Δ
unittests	64.12% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[sentry]

Suspect Issues

This pull request was deployed and Sentry observed the following issues:

• ‼️ ReferenceError: smooth is not defined in production

_{Did you find this useful? React with a 👍 or 👎}