test(store): add test coverage for createStore with custom middleware chaining #3293

Summary of What Needs to be Done

Add test coverage for createStore with user-supplied custom middleware chaining in packages/store/src/store.test.ts.

Changes that Need to be Made

• Add a test file packages/store/src/middleware.test.ts
• Test a simple logging middleware that wraps set calls
• Test middleware chaining: apply two middleware in sequence
• Test that middleware can access previous state and next state
• Test that throwing in middleware correctly propagates the error

Impact that it would Provide

• Documents the middleware API contract for custom middleware authors
• Ensures middleware chaining order is predictable
• Covers a critical extensibility feature that lacks test coverage

Note: please assign this issue to the tmdeveloper007 account.