v0.3 - Initial Release

Add offline mode UI improvements in Carrier Browser

- Add offline banner with WiFi icon and info message
- Update StatusBadge to show "📴 OFFLINE" state when remoteVersion is null
- Disable "Aktualizuj" button offline with tooltip "Wymaga internetu"
- Add animated visibility for offline banner (expandVertically/shrinkVertically)
- Fix infinite loading state when update fails offline by observing operationStatus
- Add safety timeout (10s) to reset isOperating state
- Pass operationStatus to CarrierCard for proper state management
- All changes in CarrierBrowserScreen.kt (CarrierCard is internal function)