Fix calculation of width of "view container title"

[cmdcolin]

This PR fixes a bug observed by @scottcain in chat where the "view title" could sometimes have incorrect width. There was a bad assumption in the code that the "clientWidth" was essentially observable, but this is not the case (it is a static html prop, not part of react, etc).

This PR updates the view title to use our proper ResizeObserver based useMeasure hook to get the width

[codecov]

Codecov Report

Merging #3866 (6e7d6ed) into main (f8f0a77) will decrease coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #3866      +/-   ##
==========================================
- Coverage   64.45%   64.45%   -0.01%     
==========================================
  Files        1004     1004              
  Lines       29812    29809       -3     
  Branches     7155     7154       -1     
==========================================
- Hits        19216    19213       -3     
  Misses      10430    10430              
  Partials      166      166              

Files Changed	Coverage Δ
packages/core/ui/EditableTypography.tsx	56.66% <100.00%> (-3.94%)	⬇️

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