Fix output float dtype in fusion

[laggui]

Checklist

• Confirmed that run-checks all script has been executed.

Changes

With the addition of float_cast op, some output were still incorrectly being initialized as the default elem type. Fixed that to use the input dtype.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.16%. Comparing base (e2fa9c4) to head (be761b7).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2671      +/-   ##
==========================================
+ Coverage   83.14%   83.16%   +0.02%     
==========================================
  Files         839      841       +2     
  Lines      107913   107958      +45     
==========================================
+ Hits        89719    89781      +62     
+ Misses      18194    18177      -17     

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