Add Testing Framework (Jest & Cypress) for Frontend

We currently lack a testing framework for the First Issue application. The absence of unit tests makes it challenging to ensure that new changes do not break existing functionality. To address this, we should introduce and configure Jest and/or Cypress, both popular JavaScript testing frameworks.

1. Integrate the testing framework for the frontend components.
2. Write unit tests to cover various functionalities of the frontend.
3. Introduce mocking for external dependencies to isolate components during testing.
4. Set up scripts the test to run tests automatically during development (e.g., with watch mode).
5. Configure Jest to generate coverage reports to monitor test coverage.

Follow best practices while implementing this. Not all of the above points may be applicable but its just guidelines.