Remove redux

[dayhaysoos]

• removed redux
• Rewrite everything in TypeScript
• Re-org tests
• Class based approach instead a state management libraries

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Note

Removes Redux and migrates to a TS ShoppingCart class with immutable state, pub/sub, storage, Stripe, and new React provider/hooks; updates tests/build to Vitest and cleans up legacy files.

• Core (TypeScript):
  • Introduce ShoppingCart class with immutable state updates, pub/sub subscriptions, local storage persistence, input validation, and Stripe checkout helpers.
  • Add utilities: types.ts, Entry.ts, formatters.ts, storage.ts, validation.ts; new core/index.ts API and filterCart helper.
  • Remove legacy Redux slice/middleware and related core entry/tests.
• React:
  • Add CartProvider and useShoppingCart (uses useSyncExternalStore); update useOptimisticCart and useCartActions to new API; new react/index.ts exports.
• Tests & Build:
  • Co-locate tests (Vitest + jsdom), add comprehensive unit/integration tests for core and react.
  • Update Rollup config for TS/JSX builds; adjust type tests and serverless typings.
• Docs:
  • Add guides: immutable state fix, Redux removal plan, Stripe API modernization.
• Dependencies:
  • Remove Redux-related deps; add Vitest/UI, jsdom, TS presets; update package exports and scripts.

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