refactor: don't use private reanimated API

[kirillzyusko]

📜 Description

Added a support for Expo snack.

💡 Motivation and Context

In this PR I re-worked the approach how I attach worklet handlers to KeyboardControllerView. Prior to #538 we simply broadcasted events for stored worklet handlers inside a global object. But this approach had downsides, such as slow flow of execution, so I re-worked it in #538 and instantly introduced issues like: #551 and #555

While I managed somehow to fix it, the new approach wasn't ideal:

• we still used internal API that was relying on FS structure;
• this is highly internal API that can be changed anytime and will not assure that lib works across all reanimated versions;
• in Expo Go I see strange errors, but I tend to think they are derived from the same issue - my code can not lookup a module and we get a crash 🤷‍♂️

I kept the idea to re-work this piece of code and in this PR I'm doing it. I can not use public API only, but the new approach is actually smarter. The new idea is that we still use registerEvent

Should fix errors like:

Actually correct solution for: #555

In future I'll be able to add interactive code samples into documentation, so people can run demos straight in the browser.

📢 Changelog

JS

• remove event-handler files;
• remove event-mapping file;
• use useEvent/useHandler hook for useKeyboardHandler and useFocusedInputHandler hooks;
• use registerForEvents/unregisterFromEvents methods from WorkletEventHandler (instance returned by useEvent hook);

I also had to use never types, or cast to my types using as unknown as, since I anyway access reanimated internals. But it's safer to use internals in this way, than before 🤞

🤔 How Has This Been Tested?

Tested manually on:

• iPhone 16 Pro (new arch, iOS 26.0);
• e2e tests;

📸 Screenshots (if appropriate):

📝 Checklist

• CI successfully passed
• I added new mocks and corresponding unit-tests if library API was changed

[github-actions]

📊 Package size report

Current size	Target Size	Difference
224205 bytes	225067 bytes	-862 bytes 📉