Introduce centralized language configuration and wire locale-aware behavior across scraping and ranking. Adds src/lib/constants/language-config.ts with per-language scraping rules, stop words, and character replacements; replaces AudibleRegion.isEnglish with a language field in types and AUDIBLE_REGIONS. Update AudibleService, ebook scraper, processors, and API routes to use getLanguageForRegion so Anna's Archive searches, scraping selectors, runtime/rating parsing, and ranking use language-specific params and filters. Extend ranking algorithm to accept stopWords and characterReplacements and apply them during normalization and matching. Update UI selects to mark non-English regions and adjust tests accordingly.
Add an isEnglish flag to AUDIBLE_REGIONS and update region handling across the app. UI: populate Audible region selects from AUDIBLE_REGIONS and mark non-English regions with a '*' and an amber warning explaining limited feature support. Service: set axios default param language=english on Audible requests (simplifies/fixes locale handling) and remove the previous locale-correction flow. API: validate regions dynamically from AUDIBLE_REGIONS. Also bump package version to 1.0.2. These changes make region metadata explicit and inform users about limited support for non-English regions while forcing English content where supported.
Introduced a Vitest-based backend unit testing framework with supporting scripts, helpers, and GitHub Actions integration. Refactored the admin settings page to a modular architecture, splitting monolithic logic into feature-specific tabs and hooks for improved maintainability and testability. Updated documentation to reflect the new testing setup and settings architecture, and added new dependencies for testing utilities.