Migrate to more modern toolset (Vite, Vitest, Playwright) + Upgrade dependencies

[alan2207]

Considering the fact that the project was built almost 3 years ago, it was about the time to revisit it and make the necessary updates. This PR includes the following changes:

• All packages have been upgraded to their latest major versions (except ESLint which was upgraded to v8, let's wait for v9 a bit)
• Switching from CRA to Vite, which was the most requested and the most obvious change.
• Switching from Jest to Vitest, since Vitest integrates well with the Vite setup, is more maintained and there are far fewer issues.
• Switching from Cypress to Playwright which is a more powerful and modern e2e-testing tool.
• Storing auth token in cookie over localStorage.
• Validating env variables with zod.
• Updating UI by moving to using ShadCN UI
• Switching to kebab case files for all files

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[ThePiyushAggarwal]

This is great