feat(hooks): add use hook

[gaoachao]

Summary

• add React 19-style use() support in preact/hooks for Promises and Contexts
• keep use() order-insensitive by avoiding useState/useContext internally
• expose use through compat default/types and add coverage for Promise, Context, conditional calls, falsy values, rejection, exports, and TS types

Tests

• npm test

[github-actions]

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[gaoachao]

Hi @JoviDeCroock @rschristian , I reworked the use() implementation based on your feedback from #4970, especially around keeping it small, avoiding React-specific details in core, and not building it on top of order-sensitive hooks like useState or useContext.

The new PR implements use() for Promises and Contexts, with tests covering conditional calls, falsy promise values, rejection handling, shared promises, Context updates, exports, and TypeScript types. When you have time, could you take another look and let me know if this direction better matches Preact’s design philosophy?

[gaoachao]

@JoviDeCroock Thanks for the suggestions! I applied all three changes:

• added the TSDoc for use(),
• inlined the Promise handling into use() to keep the implementation smaller,
• removed the extra _contexts field and simplified the Context path.

I also reran the relevant hooks tests and the full suite, and everything is passing now.