fix: small getitem fixes for napari

[tlambert03]

No description provided.

[codecov]

Codecov Report

Merging #44 (407870f) into main (d8b7cbd) will increase coverage by 0.06%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #44      +/-   ##
==========================================
+ Coverage   96.28%   96.34%   +0.06%     
==========================================
  Files          32       32              
  Lines        1667     1668       +1     
==========================================
+ Hits         1605     1607       +2     
+ Misses         62       61       -1     

Impacted Files	Coverage Δ
src/app_model/registries/_commands_reg.py	95.83% <100.00%> (+1.38%)	⬆️
src/app_model/registries/_menus_reg.py	100.00% <100.00%> (ø)

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