fix: improve placeholder prompt detection

[mtth]

No description provided.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.48%. Comparing base (b82ec1f) to head (dfecdc3).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #72   +/-   ##
=======================================
  Coverage   90.48%   90.48%           
=======================================
  Files          10       10           
  Lines         704      704           
  Branches       55       55           
=======================================
  Hits          637      637           
  Misses         47       47           
  Partials       20       20           

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