Electron MaxStep Widget

[AndresOrtegaGuerrero]

This PR address #798 ,
I have encounter that this limit with some materials is quite small , for example lanthanides , so is good to have this control.

[codecov]

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@@           Coverage Diff           @@
##             main     #800   +/-   ##
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  Coverage        ?   68.79%           
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  Files           ?       49           
  Lines           ?     4243           
  Branches        ?        0           
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  Hits            ?     2919           
  Misses          ?     1324           
  Partials        ?        0           

Flag	Coverage Δ
python-3.11	68.79% <100.00%> (?)
python-3.9	68.82% <100.00%> (?)

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[mikibonacci]

Hi @AndresOrtegaGuerrero , LGTM!