* feat(i18n): add Turkish (tr-TR) translation
* fix(i18n): derive LanguageCode from resources to avoid sync drift
* fix(i18n): make Turkish selectable and fix tr-TR syntax errors
- Fix unescaped quotes in tr-TR search strings that broke the build
- Add Turkish entry to LanguageToggle so it is selectable in the UI
- Register Turkish date-fns locale for date formatting
- Add turkish language name key across all locales for consistency
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Co-authored-by: Luis Novo <lfnovo@gmail.com>
