✨ Add unit test

[TheDanniCraft]

No description provided.

[Copilot]

Pull Request Overview

This PR sets up a comprehensive unit testing framework for the project using Jest with separate configurations for DOM and Node.js environments. The testing infrastructure includes coverage reporting, watch mode, and CI integration.

• Adds Jest testing framework with TypeScript support and testing libraries
• Creates separate Jest configurations for DOM (React components) and Node.js (server-side code) testing
• Integrates test execution into the CI workflow

Reviewed Changes

Copilot reviewed 7 out of 9 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
package.json	Adds Jest and testing library dependencies, plus test scripts for different environments
jest.config.ts	Main Jest configuration that orchestrates DOM and Node test projects
jest.dom.config.ts	Jest configuration for DOM/React component testing with jsdom environment
jest.node.config.ts	Jest configuration for Node.js/server-side testing
jest.dom.setup.ts	Setup file for DOM tests with jest-dom matchers
jest.node.setup.ts	Setup file for Node.js tests (currently empty)
.github/workflows/ci.yml	Updates CI workflow to run tests instead of placeholder

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[TheDanniCraft]

Moving to backlog for now, will focus on bugfixing for v1 release