Refactor Fillet AST Mod to Async Actor

[max-mrgrsk]

Description:

Convert the fillet AST mod from a synchronous XState action to an asynchronous actor.
This removes ESLint exceptions and ensures proper async handling.

Closes: #4749
Project: #2606

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Name	Status	Preview	Updated (UTC)
modeling-app	✅ Ready (Inspect)	Visit Preview	Dec 18, 2024 1:46pm

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.84%. Comparing base (3630696) to head (758dc81).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4803   +/-   ##
=======================================
  Coverage   85.84%   85.84%           
=======================================
  Files          86       86           
  Lines       30893    30893           
=======================================
  Hits        26519    26519           
  Misses       4374     4374           

Flag	Coverage Δ
wasm-lib	85.84% <ø> (ø)

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[max-mrgrsk]

One test keeps failing. The rest is ok.

[pierremtb]

Took the liberty to trigger the CI again after the updated snaps