refactor(desktop): name the database a Firefox read failed on

Firefox keeps one cookie database per profile, so a failure carrying only a
reason cannot be traced back to the profile that produced it. The path is now a
structural attribute, matching `ChromiumCookieReadError`.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
c5d326b60fJulius Marminge committed on 9/4/2026, 6:20:45 AMparent0e0133b
1 file changedLine totals unavailable