Some fefv stuff (still work in progress) and correctiosn to dumb impl…

[cmhamel]

…ementation of Lagrangian heat flux.

[codecov]

Codecov Report

❌ Patch coverage is 87.50000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 60.09%. Comparing base (0b9a1d8) to head (ca09be2).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/modules/heat_conduction/HeatConduction.jl	85.71%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #62      +/-   ##
==========================================
+ Coverage   60.07%   60.09%   +0.02%     
==========================================
  Files          35       35              
  Lines        1708     1709       +1     
==========================================
+ Hits         1026     1027       +1     
  Misses        682      682              

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