fix(core): prevent setState crashing when used directly

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Overview

This fix resolves a bug introduced in 06c8227 which converted setState from an arrow function to a standard function. The change meant that the this context was no longer bound to the store, and would cause the function to crash when called directly const setState = store.setState.

Since this change was necessary for function definition overloading in typescript, This PR bounds the function to the store in the constructor and adds test cases for this scenario

[Copilot]

Pull Request Overview

This PR fixes a bug where calling setState via a detached reference would crash due to an unbound this context. Key changes include binding setState to the store instance in the constructor and adding a new test to ensure setState works correctly when not directly called on the store.

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
packages/store/tests/store.test.ts	Added a test case validating that setState works via a detached reference.
packages/store/src/store.ts	Binds setState to the store instance in the constructor to fix the context issue.