What's Changed

Changed

• Redesigned bundle construction to return configuration errors instead of silently accepting invalid locale setup.
• Made catalog loading atomic: failed loads leave the previous direct catalog untouched.
• Resolved fallback chains at lookup time instead of storing fallback-populated catalog copies.
• Replaced TranslationResult.Locale with MatchedLocale and CatalogLocale so direct, fallback, and missing results are unambiguous.
• Isolated MessageFormat integration and clarified compilation errors.
• Updated runtime dependencies.

Breaking Changes

• NewBundle now returns (*I18n, error).
• Option now configures construction state rather than mutating a live bundle.
• TranslationResult.Locale was removed; use MatchedLocale and CatalogLocale.
• Loading an invalid or unconfigured locale now returns an error instead of skipping it.