This allows users to authenticate with google, link a google calendar account to the app, and then view your google account events on a usable embedded calendar on your phone!
This looks interesting!
I see you used webview with fullcalendar.io for the Calendar section.
Would the webview be a good choice for a published app? Does it works for iOS as well?
Edit: would it also be possible to make it an offline script? (maybe an html asset)
I created a project in the Google Cloud Platform (GCP) and then setup an oAuth consent screen. I used firebase hosting to host the redirect screen which consists of a button and a few lines of code. On the GCP I created a set of oAuth 2.0 credentials for a web app.