WIP: Shell dry-run validation with thickness arg

[pierremtb]

@nadr0 I was playing with this today. Moves the shell validation to the last argument (thickness) so we can run it on provided selections and thickness. Maybe this workflow could become the default one for the review stage of the command bar process. Or evolve into something else. But I figured this wasn't the only command that it could be useful for. Let me know if you have any thoughts

[qa-wolf]

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[qa-wolf]

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Name	Status	Preview	Updated (UTC)
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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.14%. Comparing base (440704e) to head (bfb0bd6).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5118   +/-   ##
=======================================
  Coverage   86.14%   86.14%           
=======================================
  Files          89       89           
  Lines       32489    32489           
=======================================
  Hits        27987    27987           
  Misses       4502     4502           

Flag	Coverage Δ
wasm-lib	86.14% <ø> (ø)

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[nadr0]

Yeah this is a good idea within the command bar. Since the user provides these values step by step, it makes sense to help them from shooting themselves in their foot.