make check for n_bins more robust/performant

[kecnry]

tests were occasionally failing because they relied on an exception in the live-update which sometimes did not trigger in time.

[codecov]

Codecov Report

Attention: 11 lines in your changes are missing coverage. Please review.

Comparison is base (a4eaea7) 95.04% compared to head (8503d3f) 94.23%.
Report is 2 commits behind head on main.

Files	Patch %	Lines
lcviz/components/components.py	92.64%	5 Missing ⚠️
lcviz/plugins/flatten/flatten.py	81.48%	5 Missing ⚠️
lcviz/tools.py	92.30%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #80      +/-   ##
==========================================
- Coverage   95.04%   94.23%   -0.81%     
==========================================
  Files          32       36       +4     
  Lines        1393     1545     +152     
==========================================
+ Hits         1324     1456     +132     
- Misses         69       89      +20     

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