Implement Google Sign-In authentication and add sign-out functionality

[baogorek]

Dev notes:

• Needs the Google client id in the .env file: VITE_GOOGLE_CLIENT_ID=
• There are new packages so run npm install

Storing the token using localStorage, which is different than cookies. It is the most convenient and long lasting, but there is a security vulnerability from cross site scripting attacks. Still, it seems this is a pretty common method.

• Added Google Sign-In using @react-oauth/google
• Created Login component
• Updated App.tsx for conditional rendering based on authentication state
• Added sign-out button in SimulationWizard
• Updated package.json and package-lock.json with new dependencies

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