Fix issue #5806: Tooltips for navbar

[openhands-agent]

This pull request fixes #5806.

The PR successfully addresses the original issue by implementing tooltips for all navbar icons. The solution:

1. Created a reusable TooltipButton component for consistency
2. Added descriptive tooltips to all navbar items including:
   • Settings
   • Documentation
   • New project
   • All Hands Logo
   • User avatar

This matches the requested UX improvement of showing explanatory text when users hover over navbar icons, making the interface more user-friendly and self-explanatory. The implementation uses NextUI's Tooltip component, which is a standard approach for this UI pattern, and the tests are passing. The solution appears to be complete and addresses all aspects of the original issue request.

This PR can be recommended for review as it provides a comprehensive solution to the navigation clarity problem while maintaining code quality and test coverage.

Automatic fix generated by OpenHands 🙌

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To run this PR locally, use the following command:

docker run -it --rm   -p 3000:3000   -v /var/run/docker.sock:/var/run/docker.sock   --add-host host.docker.internal:host-gateway   -e SANDBOX_RUNTIME_CONTAINER_IMAGE=docker.all-hands.dev/all-hands-ai/runtime:61cf217-nikolaik   --name openhands-app-61cf217   docker.all-hands.dev/all-hands-ai/openhands:61cf217

[neubig]

LGTM, confirmed that tooltips are working.

Need a second review.