feat: Add incremental Nitro View prop clone path

[mrousavy]

Summary

• add a Nitro-local React Native 0.87+ clone path
• copy the previous immutable Props snapshot
• iterate only RawProps keys present in the patch
• dispatch each key through the concrete Props setProp method
• preserve filtered Android dynamic props initialization
• retain the classic JSI constructor for older React Native versions and older generated Nitro Props

The branch is dormant until a concrete generated Props class provides setProp in the next PR. It does not require apps to enable the global experimental React Native feature flag.

This draft PR is intentionally kept at the back of the stack and depends on #1510.

Validation

• generated Android C++ syntax checks against React Native 0.79, 0.85, 0.86, and 0.87 headers
• React Native 0.87 Nitro CMake target build
• React Native 0.85 iOS and Android native builds

Note

With the global React Native iterator flag disabled, React Native can still perform its one-time RawPropsParser preparation in the descriptor constructor. This PR removes repeated per-update parsing for Nitro Props, not that startup cost.

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