Fix Sentry integration

Closes #1063 (closed)

Sentry apparently switched to a @sentry/vue package without really explicitly mentioning it in its documentation, and the older integration still worked but only in a browser context, not a Vue context, so we were still catching some exceptions outside of Vue.

I did manage to throw an error in a random component with this change: https://sentry.io/organizations/teklia/issues/3555148671/