appbar out of sync check animating is finished

[JeffGreiner-eaton]

Fixes #736.

Changes proposed in this Pull Request:

• add hook to check animating is finished

Screenshots / Screen Recording (if applicable)

To Test:

• https://blui-react-docs--pr858-bug-blui-5306-sync-a-xoung6dm.web.app/components/app-bar/playground
• quickly scroll collapsible appbar referenced in issue

Any specific feedback you are looking for?

[codecov]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (f47f62b) 84.03% compared to head (cd31838) 83.93%.

Files	Patch %	Lines
components/src/core/AppBar/AppBar.tsx	60.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #858      +/-   ##
==========================================
- Coverage   84.03%   83.93%   -0.10%     
==========================================
  Files          58       58              
  Lines        1234     1239       +5     
  Branches      158      159       +1     
==========================================
+ Hits         1037     1040       +3     
- Misses         98      100       +2     
  Partials       99       99              

Flag	Coverage Δ
unittests	83.93% <60.00%> (-0.10%)	⬇️

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[github-actions]

Visit the preview URL for this PR (updated for commit cd31838):

https://blui-react-docs--pr858-bug-blui-5306-sync-a-xoung6dm.web.app

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[JeffGreiner-eaton]

I'll need to add some additional testing to appbar