feat: Generate incremental Nitro View prop setters

[mrousavy]

Summary

• generate the concrete nonvirtual setProp hook for React Native 0.87+
• always chain ViewProps::setProp before dispatching Nitro props
• use the React Native 32-bit prop hash macros
• convert directly from RawValue while preserving JSI functions, HybridObjects, and cached identity
• reset optional props on null or undefined and reject required-prop removal with a labeled error
• generate filtered Android initializeDynamicProps support
• strengthen the View harness to remove and re-add the exact same hybridRef callback

This PR depends on feat/view-props-iterator-fast-path and activates its changed-key-only clone path.

Validation

• React Native 0.87 Nitro CMake target build with HasIteratorSetterCtor enabled
• React Native 0.85 iOS and Android native builds
• full Nitro View harness on iOS 18.4: 6 of 6 passing
• full Nitro View harness on Android API 35: 6 of 6 passing
• workspace typecheck, lint, deterministic generation, and native formatting

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1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
nitro-docs	Skipped		Aug 20, 2026 1:40pm