fix(Button): specify size for enabled/disabled buttons

[booc0mtaco]

• separate out the size metrics from the internal size styles
• regenerate snapshots for comparison
• add story for showing disabled buttons at all sizes

Test Plan:

• Wrote/updated automated tests
• CI tests / new tests are not applicable
• Manually tested my changes, and here are the details:

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.06%. Comparing base (eadbcd0) to head (9740185).
Report is 2 commits behind head on next.

Additional details and impacted files

@@           Coverage Diff           @@
##             next    #2063   +/-   ##
=======================================
  Coverage   97.05%   97.06%           
=======================================
  Files         111      111           
  Lines        2752     2756    +4     
  Branches      728      732    +4     
=======================================
+ Hits         2671     2675    +4     
  Misses         78       78           
  Partials        3        3           

Flag	Coverage Δ
	97.06% <100.00%> (+<0.01%)	⬆️

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[github-actions]

size-limit report 📦

Path	Size
components	92.46 KB (+0.02% 🔺)
styles	28.73 KB (+0.1% 🔺)

[sskikne]

lgtm

[booc0mtaco]

Thanks @sskikne ! (the size thing is a quirk on the button component right now, which I wanna clean up. having styles suffixed --prop-value is the general pattern, but this was the first component we did when building 2.0 and hadn't figured that out yet)