Passwords are no longer stored in config.toml. Instead:
- New setup wizard (--configure) prompts for credentials on first run
and stores them in the OS keychain (macOS Keychain, GNOME Keyring /
KWallet on Linux, Windows Credential Manager)
- Env-var fallback: TUIMAIL_<KEY> for headless environments
- ProtonMail session token moves from session.json to the keychain
- Config file path moves to {config_dir}/tuimail/config.toml
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>