[tomekzaw]

Summary:

StateWrapperImpl was created with newObjectJavaArgs(). That's a NewObject, whose Java constructor calls back into C++ through initHybrid to create the C++ part. Then cthis() looks that part up again to call setState. The class is only ever created from C++ (its constructor is private), for Create and UpdateState mount items and for preallocation.

It now has a private constructor that takes the state, and those three places create it with newObjectCxxArgs(state), like EventEmitterWrapper. The Java class no longer has initHybrid. The constructor is private, with friend HybridBase, so the public C++ API doesn't change.

Changelog:

[ANDROID] [CHANGED] - Create StateWrapperImpl without a call back from Java

Test Plan:

A Playground screen that mounts 200 Images every 500 ms. Each image gets a StateWrapperImpl when it is preallocated and another one for its UpdateState item. Time per StateWrapperImpl (C++ timer around its creation), and per transaction:

	Galaxy A16	Pixel 9a	OPPO CPH2269	moto g57 power
One StateWrapperImpl, preallocation	11.04 µs → 7.77 µs (−30%)	936 ns → 732 ns (−22%)	5.71 µs → 4.46 µs (−22%)	8.68 µs → 6.07 µs (−30%)
One StateWrapperImpl, UpdateState item	1.15 µs → 846 ns (−27%)	855 ns → 631 ns (−26%)	4.58 µs → 3.23 µs (−29%)	886 ns → 625 ns (−29%)
executeMount (C++), 200 images	1.84 ms → 1.71 ms (−7%)	1.88 ms → 1.85 ms (no change)	4.99 ms → 5.02 ms (no change)	2.00 ms → 1.86 ms (−7%)

Setup:

• Release RNTester (./gradlew :packages:rn-tester:android:app:assembleRelease -PreactNativeArchitectures=arm64-v8a, R8 on) with default feature flags, compiled with cmd package compile -m speed.
• Temporary timing probes, not part of this PR, and a Playground scenario opened by deep link.
• Each run is a fresh process: a 12 s window after the scenario starts, reported as the median of its samples. Per phone, one discarded run of each build, then 8 A/B/B/A cycles of main and this PR (16 processes per build).
• Each figure is the median of the 16 processes. A change is shown when its 95% bootstrap confidence interval excludes zero, and "no change" otherwise.
• The Galaxy A16, Pixel 9a and moto g57 power run Android 16. The OPPO CPH2269 runs Android 11.

yarn cxx-api-validate (Doxygen 1.16.1): all 12 C++ API snapshots match, with no changes needed.

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