Bug: sizing of workspaceAdd

[fstoe]

When using the M3 Viewer with the workspaceControlPanel set to false and placed next to a custom sidebar (allowing custom actions and triggering the Mirador catalog view), the fixed sizing of the drawer component and the workspaceAdd div results in the drawer overlapping the sidebar

oldBehavoirWithoutFix_cutupsidebar.webm
customSidebar_fixed.webm

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (04c5b67) 92.49% compared to head (143452b) 92.53%.
Report is 11 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3821      +/-   ##
==========================================
+ Coverage   92.49%   92.53%   +0.04%     
==========================================
  Files         201      201              
  Lines        3465     3471       +6     
==========================================
+ Hits         3205     3212       +7     
+ Misses        260      259       -1     

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