feat: add tests for Minimal Standard Toast

[codered-sjy]

• Tests for MinimalStandardToast
• Updated trailing commas

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.22%. Comparing base (fb1cb0a) to head (2883046).
⚠️ Report is 34 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #185      +/-   ##
==========================================
+ Coverage   74.30%   81.22%   +6.92%     
==========================================
  Files          31       31              
  Lines         895      895              
==========================================
+ Hits          665      727      +62     
+ Misses        230      168      -62     

Flag	Coverage Δ
flutter	81.22% <ø> (+6.92%)	⬆️

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[payam-zahedi]

Thanks, @codered-sjy, for your effort—I really appreciate your contribution!

I’ve added some comments; feel free to check them out and update your code.