test: split typecheck step into two

[mrlubos]

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Project	Deployment	Actions	Updated (UTC)
hey-api-docs	Ready	Preview, Comment	Feb 13, 2026 1:46am

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Latest commit: a1a33fb

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 39.26%. Comparing base (d0d0c0f) to head (a1a33fb).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3389   +/-   ##
=======================================
  Coverage   39.26%   39.26%           
=======================================
  Files         466      466           
  Lines       17151    17151           
  Branches     5239     5245    +6     
=======================================
  Hits         6734     6734           
  Misses       8348     8348           
  Partials     2069     2069           

Flag	Coverage Δ
unittests	39.26% <ø> (ø)

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