fix(ui): trim input in composer send check

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Linear: FLU-462

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 65.32%. Comparing base (cd3cd88) to head (a6a1fa8).
⚠️ Report is 6 commits behind head on feat/design-refresh.

Additional details and impacted files

@@                 Coverage Diff                  @@
##           feat/design-refresh    #2586   +/-   ##
====================================================
  Coverage                65.32%   65.32%           
====================================================
  Files                      429      429           
  Lines                    26137    26137           
====================================================
  Hits                     17073    17073           
  Misses                    9064     9064           

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