fixed susde-related audit findings

[mpsc0x]

This PR addresses audit findings:

• https://cantina.xyz/code/5376c015-441e-40e3-8252-0d328c537906/findings/52
• https://cantina.xyz/code/5376c015-441e-40e3-8252-0d328c537906/findings?finding=41

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.57%. Comparing base (21619ff) to head (8ad1621).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #69      +/-   ##
==========================================
- Coverage   97.69%   97.57%   -0.13%     
==========================================
  Files          38       38              
  Lines         781      782       +1     
==========================================
  Hits          763      763              
- Misses         18       19       +1     

Flag	Coverage Δ
move	97.57% <ø> (-0.13%)	⬇️

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[matchv]

Both findings look valid to me, so are the fixes.