83 Show-hide user search bar on scroll

[mwarman]

📢 Instructions

• Begin with a DRAFT pull request.
• Follow italicized instructions to add detail to assist the reviewers.
• After completing all checklist items, change the pull request to READY.

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🔧 Change Summary

List the changes included in this pull request.

• Issue: Hide user search toolbar on scroll #83
• Create a ScrollProvider and hook for the context
• Show and hide the user search toolbar based upon scrolling up and down the list of users.

📝 Checklist

Pull request authors must complete the following tasks before marking the PR as ready to review.

• Complete a self-review of changes
• Unit tests have been created or updated
• The code is free of [new] lint errors and warnings

🧪 Steps to Test

Describe the process to test the changes in this pull request.

1. View the user list (small viewport)
2. Show and hide the search toolbar when scrolling up and down.

🔗 Additional Information

Optionally, provide additional details, screenshots, or URLs that may assist the reviewer.

• ...