Make sure you have updated to the latest SDK version. Some of those errors look like things from older versions of the SDK. In package.json, the SDK version should match your community version.
Once you change it, follow it up with a npm install. If you SDK is indeed that old, you may also need to switch from Node 16 to 18.
I double checked and ran the SDK install again and it's showing I'm on Node 18.20.4 and SDK v 24.4.4
Just updated my SDK to v 24.8.1 and still getting the same issues unfortunately
What OS are you using?
As for the first question you had; you don't need to worry about bearer tokens or authentication with GraphQL calls in handlebars. They get run in the current users context (e.g. as the currently logged in user, or anonymous if the user isn't logged in)
