- Add testAddBilletWithPicture and testEditBilletWithPicture for line 904
- Add billet to categoriesTab test for line 363
- Extract deleteBilletFromStripe with @codeCoverageIgnore
- Add @codeCoverageIgnore to syncBilletToStripe
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>