Set ChatMessage min_width_0 and break anywhere

[ahuang11]

Simon mentioned this: https://www.youtube.com/watch?v=cH8VbLM1958
https://www.joshwcomeau.com/css/interactive-guide-to-flexbox/#the-minimum-size-gotcha-11

Awkward overflowing before:

Now:

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (46e0639) 84.69% compared to head (4e0044d) 84.70%.
Report is 14 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff            @@
##             main    #6187    +/-   ##
========================================
  Coverage   84.69%   84.70%            
========================================
  Files         296      296            
  Lines       44184    44321   +137     
========================================
+ Hits        37423    37542   +119     
- Misses       6761     6779    +18     

Flag	Coverage Δ
ui-tests	40.72% <ø> (-0.01%)	⬇️
unitexamples-tests	72.61% <ø> (-0.01%)	⬇️

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[MarcSkovMadsen]

Have you tested the different templates? In my experience css changes can behave different in each of these.