- Add 10 new fonts (Literata, Merriweather, Source Serif, Lato, Montserrat, Source Sans)
- Support Apple system fonts and Google Fonts (OFL 1.1 licensed)
- Extend FontFamily enum with new fonts and categories
- Update FontSettingsViewModel and WebView with font support
- Force WebView reload when font settings change
- Refactor OfflineSyncManager with protocol and improved error handling
- Add test mocks and OfflineSyncManagerTests with 9 test cases
- Add OpenSourceLicensesView and FontDebugView
- Bump build number
- Update localization strings
