<!-- This is an auto-generated comment: release notes by coderabbit.ai -->
## Summary by CodeRabbit
- **New Features**
- Introduced a new mobile view extension that activates mobile-specific UI features based on the runtime environment.
- Automatically enables mobile keyboard toolbar and linked document menu features in mobile contexts.
- **Improvements**
- Simplified code and paragraph block configurations on mobile, including disabling line numbers and adjusting placeholders.
- Enhanced configuration chaining to include mobile-specific settings by default.
- Improved extension registration flow with method chaining support.
- **Refactor**
- Removed deprecated mobile patch classes and configurations, consolidating mobile logic into dedicated extensions.
- Streamlined mobile-related code for better maintainability and performance.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
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