feat: scrolling floating toolbar

[zuvola]

The toolbar is inconveniently hidden when the window is small, so I modified it to scroll.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 72.18%. Comparing base (8d3f5b9) to head (80dfa73).
⚠️ Report is 95 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #842      +/-   ##
==========================================
+ Coverage   72.17%   72.18%   +0.01%     
==========================================
  Files         319      319              
  Lines       15215    15221       +6     
==========================================
+ Hits        10981    10987       +6     
  Misses       4234     4234              

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

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[RigleyC]

+1