docs: initial props demo docs & demos

[artus9033]

Summary

This PR adds 2 enhancements:

• updates docs to disambiguate the options exposed by our public API for passing in initial root component props to a brownfield RN view, which apparently cause confusion (e.g. Passing data to react native and react native to native ios data passing #130)
• updates the demo apps to receive a demo props being the OS version string from the native side, and display it to the user

Test plan

CI green + tested manually.

[Copilot]

Pull request overview

This PR clarifies how to pass initial root-component props into a React Native brownfield view across the public APIs, and updates the sample apps to pass an OS version label from native to JS and render it in the UI.

Changes:

• Docs: disambiguate Android initialize(options) vs view/root initial props (createView(..., launchOptions)), and add initial-props notes for iOS/Android API references.
• JS demos: accept nativeOsVersionLabel as an initial prop and display it (RNApp + Expo RNApp variants).
• Native demos: pass OS version via initial props/launch options (Android fragment args; iOS SwiftUI wrapper).

Reviewed changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
docs/docs/docs/api-reference/react-native-brownfield/swift.mdx	Adds guidance about passing root initial props via view(..., initialProps)
docs/docs/docs/api-reference/react-native-brownfield/objective-c.mdx	Adds guidance about passing root initial props for Obj-C API
docs/docs/docs/api-reference/react-native-brownfield/kotlin.mdx	Adds a note separating initialize(options) from createView(..., launchOptions) + explains launchOptions as initial props
docs/docs/docs/api-reference/react-native-brownfield/java.mdx	Same as Kotlin docs note/launchOptions explanation
apps/RNApp/src/nativeHostContext.tsx	Introduces context + hook for the native OS version label
apps/RNApp/src/HomeScreen.tsx	Renders the OS version label when provided
apps/RNApp/src/App.tsx	Accepts nativeOsVersionLabel initial prop and provides it via context
apps/ExpoApp55/RNApp.tsx	Accepts and displays nativeOsVersionLabel initial prop
apps/ExpoApp54/RNApp.tsx	Accepts and displays nativeOsVersionLabel initial prop
apps/AppleApp/Brownfield Apple App/components/ContentView.swift	Passes nativeOsVersionLabel via initialProperties to the RN view
apps/AndroidApp/app/src/main/java/com/callstack/brownfield/android/example/MainActivity.kt	Passes nativeOsVersionLabel via fragment ARG_LAUNCH_OPTIONS bundle

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[hurali97]

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