All optional entity selectors now use the format "None (description)" with i18n keys instead of hardcoded "—" or bare "None". Added common.none_no_cspt, common.none_no_input, common.none_own_speed keys to all 3 locales. Updated frontend context with the convention. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>