consolidating weak form loss functions and cleaned up/sort of blessed…

[chamel3]

… one hyperviscoelasticity example.

[codecov]

Codecov Report

❌ Patch coverage is 20.38835% with 82 lines in your changes missing coverage. Please review.
✅ Project coverage is 69.77%. Comparing base (d544006) to head (d2ff34a).
⚠️ Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
pancax/loss_functions/weak_form_loss_functions.py	17.85%	69 Missing ⚠️
pancax/loss_functions/base_loss_function.py	31.57%	13 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #144      +/-   ##
==========================================
- Coverage   70.13%   69.77%   -0.36%     
==========================================
  Files          92       92              
  Lines        4182     4209      +27     
==========================================
+ Hits         2933     2937       +4     
- Misses       1249     1272      +23     

Flag	Coverage Δ
unittests	69.77% <20.38%> (-0.36%)	⬇️

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