Description

Currently, ProtonMail users cannot verify whether their stored recovery phrase is correct without initiating an actual 2FA reset process. This creates uncertainty about whether users have properly saved their recovery credentials and could lead to account lockouts if the saved phrase is incorrect.

Feature Request:
Implement a dedicated "Verify Recovery Phrase" option in the security settings that allows users to:
- Input their recovery phrase to confirm it matches the one on file
- Receive immediate confirmation of whether the phrase is correct
- Do this without triggering any actual account recovery or 2FA reset

Benefits:
- Peace of mind: Users can periodically verify they have the correct recovery phrase stored
- Proactive security: Identifies issues with stored recovery phrases before an emergency occurs
- Reduced support burden: Fewer users locked out due to incorrect recovery phrases
- Better user experience: No need to go through a disruptive reset process just to test credentials

Implementation suggestion:
Add a "Verify Recovery Phrase" button in Account Settings → Security → Two-Factor Authentication section. When clicked, it opens a dialog where users can enter their phrase and receive a simple "✓ Verified - This recovery phrase is correct" or "✗ This recovery phrase does not match" message.

This feature would align with security best practices by encouraging users to regularly verify their backup access methods without compromising the integrity of their current security setup.