* feat(mailer): add i18n support for all transactional emails with pt-BR translations
- Create Liquid i18n filter (LiquidFilters::I18nFilter) exposing I18n.t() as `t` filter
with interpolation support via positional args
- Replace hardcoded English strings in all 26 Liquid email templates with i18n keys
- Replace hardcoded English strings in all 5 Devise ERB email templates (OSS + enterprise)
with t() calls, using raw output (<%==) to prevent HTML-encoding of apostrophes
- Translate all mailer subjects to use I18n.t() for locale-aware rendering
- Add comprehensive pt-BR translations for all transactional emails
- Add SSO-specific i18n keys for enterprise confirmation instructions
- Fix ApplicationRecord#to_drop to walk STI hierarchy (e.g. SuperAdmin -> UserDrop)
* fix: address CodeRabbit review feedback
- Use _html suffix for Devise translation keys to prevent XSS while
keeping apostrophes unencoded (Rails escapes interpolations automatically)
- Replace hardcoded English in SLA templates with full_body i18n keys
- Fix _target="blank" typo to target="_blank" in attachment links
- Add i18n for tiktok_disconnect subject and create liquid template
- Extract brand_name to private method in AccountNotificationMailer
* fix: address round 2 review feedback
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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