fix: spec compliance for TUI DIALOGS section
- Rename CertFormResult.cancelled → confirmed (True=submit, False=cancel/Esc)
- Change _FORM_FIELDS from list to tuple
- Update _FORM_LABELS to exact values: CN, Email, Password
- Update _FORM_FIELD_Y to {cn:3, email:5, password:7}
- Add password param to show_cert_form (uses generate_password() if empty)
- Add mask=True to password InputField (both init and F5-regen sites)
- Add ord("Q") to show_confirm false-return condition
- Add KEY_UP/KEY_DOWN navigation in show_cert_form
- Add Ctrl-S (0x13) as immediate submit key in show_cert_form
- Update tests/test_dialogs.py: confirmed=True on submit, confirmed=False on cancel
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
565a152243