* feat(server): update user's lastAccess * feat(ui): show user's lastAccess
* Encode/Encrypt passwords in DB * Only decrypts passwords if it is necessary * Add tests for encryption functions
* Show more descriptive success messages for User actions * Check username uniqueness when creating/updating User * Adjust translations * Add tests for `validateUsernameUnique()` Co-authored-by: Deluan <deluan@navidrome.org>