feat(android): Add theme variant and UI kit support for Android menus

[batuhanoztrk]

Summary

This PR adds comprehensive theming support for Android menus by introducing two new props: themeVariant and uiKit. This enhancement allows developers to control both the theme (light/dark/system) and UI framework (Material 3/AppCompat) of popup menus on Android, providing better visual consistency with the app's design system.

✨ Features Added

• themeVariant prop: Control menu theme with 'light', 'dark', or 'system' options
• uiKit prop: Choose between 'auto', 'material3', or 'appcompat' UI frameworks
• Automatic theme detection: System theme detection based on device settings
• Graceful fallbacks: Automatically falls back to AppCompat when Material 3 is unavailable

🔧 Technical Implementation

New Components

• ThemeHelper.kt: Utility class for theme detection and style resolution using reflection
• Enhanced MenuView.kt: Added theme and UI kit state management with dynamic PopupMenu recreation
• Updated MenuViewManagerBase.kt: Added React props for themeVariant and uiKit

Key Implementation Details

• Reflection-based approach: Safely detects Material 3 availability without hard dependencies
• Dynamic theme switching: PopupMenu is recreated with new ContextThemeWrapper when theme changes
• System theme detection: Uses Configuration.UI_MODE_NIGHT_MASK for automatic dark/light detection
• Type safety: Added proper TypeScript types (MenuThemeVariant, MenuUiKit) with exports

📱 Platform Support

• Android: ✅ Full support for both props
• iOS: ✅ themeVariant already supported, uiKit is Android-only

🔄 Breaking Changes

None - This is a fully backward-compatible addition. All new props are optional with sensible defaults.

📚 Documentation Updates

• Updated README.md with comprehensive documentation for both new props
• Added prop descriptions, type information, and platform compatibility notes
• Included examples and usage guidelines

🧪 Testing Instructions

Basic Usage

<MenuView
  themeVariant="dark"
  uiKit="material3"
  actions={[
    { id: 'test', title: 'Test Action' }
  ]}
>
  <Text>Open Menu</Text>
</MenuView>

Test Scenarios

1. Theme Variants:

   • Test themeVariant="light" - should show light themed menu
   • Test themeVariant="dark" - should show dark themed menu
   • Test themeVariant="system" - should follow system theme
   • Test without prop - should default to system theme

2. UI Kits:

   • Test uiKit="material3" - should use Material 3 styling if available
   • Test uiKit="appcompat" - should use AppCompat styling
   • Test uiKit="auto" - should prefer Material 3, fallback to AppCompat
   • Test without prop - should default to auto behavior

3. Edge Cases:

   • Test on devices without Material 3 support
   • Test theme switching during runtime
   • Test with various Android API levels

Expected Behavior

• Menus should visually match the specified theme and UI framework
• No crashes should occur on any Android version
• Graceful fallbacks should work when Material 3 is unavailable
• System theme should automatically adapt to device settings

🔍 Code Quality

• ✅ Added proper TypeScript types and exports
• ✅ Maintained backward compatibility
• ✅ Added comprehensive documentation
• ✅ Used safe reflection patterns with error handling
• ✅ Followed existing code style and patterns

📋 Checklist

• Added new themeVariant prop support for Android
• Added new uiKit prop for Android UI framework selection
• Created ThemeHelper.kt utility class
• Updated MenuView.kt with theme management
• Added React props in MenuViewManagerBase.kt
• Added TypeScript types and exports
• Updated README.md documentation
• Updated example app to demonstrate new features
• Maintained backward compatibility
• Added proper error handling and fallbacks

🎯 Related Issues

This PR addresses the need for better Android theming support and provides developers with fine-grained control over menu appearance to match their app's design system.

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Ready for review! 🚀 This enhancement significantly improves the Android user experience by providing native theming capabilities while maintaining full backward compatibility.