fix: improve result display in example apps to use .value and jsonEncode

- Replace result.toString() with JsonEncoder.withIndent('  ').convert(result.value)
- Update playground_screen.dart to use proper JSON formatting for results
- Update app.dart to use proper JSON formatting for results
- Add dart:convert import where needed
- Ensures consistent and properly formatted result display across all example apps

feat: release version 1.2.0 with complete refactor of example applica…

…tion architecture and new module management features

feat: release version 1.2.0 with complete refactor of example applica…

…tion architecture and new module management features

chore: update version to 1.1.0, enhance API design, and improve docum…

…entation

chore: enhance precompile binaries configuration and update target ar…

…chitectures for macOS

chore: update version to 1.1.0, enhance API with new features and imp…

…roved documentation

chore: update platform versions, add new plugins, and enhance documen…

…tation

chore: update platform requirements, add new plugins, and enhance doc…

…umentation

chore: update iOS deployment target to 13.0 and remove unused depende…

…ncies

chore: update Android target architectures and improve rustFlags conf…

…iguration