fix: 133 signal builder unnecessary rebuilds

[nank1ro]

closes #133

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (9e6c707) to head (a032506).
⚠️ Report is 1 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #135   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           17        17           
  Lines          926       926           
=========================================
  Hits           926       926           

Files with missing lines	Coverage Δ
...utter_solidart/lib/src/widgets/signal_builder.dart	100.00% <100.00%> (ø)

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