Implement prefersReducedMotion on native

[mozzius]

Currently, we only get the prefersReducedMotion value on web. Luckily, Reanimated has a useReducedMotion hook, but we need the value not in a hook. This PR uses the (internal) isReducedMotion function from Reanimated since it does exactly the same thing on web, and gets the value as it is at app startup on native. Check the simple implementation here

https://github.com/software-mansion/react-native-reanimated/blob/44d55dd3b6b92759fa820538d4f7c420bc8c2fa0/src/reanimated2/PlatformChecker.ts#L49

Note that the implementation of useReducedMotion is ultra simple and we could just call it here as not to rely on internal functions, but I think it's probably unsafe to break the rule of hooks here in case they change the implementation.

https://github.com/software-mansion/react-native-reanimated/blob/44d55dd3b6b92759fa820538d4f7c420bc8c2fa0/src/reanimated2/hook/useReducedMotion.ts#L4

[render]

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[github-actions]

Old size	New size	Diff
6.85 MB	6.85 MB	-58 B (-0.00%)

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[github-actions]

The Pull Request introduced fingerprint changes against the base commit: 3674c8a

Fingerprint diff

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[haileyok]

Oh holy shit, was wanting to do this before but realized it wasn't available in the RN function. This is great.

[haileyok]

This is actually a global on native too, so if you wanted to you could drop the patch and access it directly through global._REANIMATED_IS_REDUCED_MOTION the same way that _IS_FABRIC is accessible that way.

https://github.com/software-mansion/react-native-reanimated/blob/44d55dd3b6b92759fa820538d4f7c420bc8c2fa0/Common/cpp/ReanimatedRuntime/RNRuntimeDecorator.cpp#L41
https://github.com/software-mansion/react-native-reanimated/blob/44d55dd3b6b92759fa820538d4f7c420bc8c2fa0/src/reanimated2/globals.d.ts#L24

With that said though, they actually used to get the value this way for useReducedMotion(), but that changed here:
software-mansion/react-native-reanimated@d4c4084#diff-a871fd108ad80ac4a67f3bd6f0cb7c79cc07755ef257cbfcef83e179004f2e50

Could be meaningless, could mean they intend to change it. The patch at least will tell us if it ever does change so that seems fine!

[mozzius]

Yep, I think the patch is a good canary for if their internal implementation changes