fix: Handle invitation links with invalid auth token

[Dschoordsch]

When following an invitation link with an old auth token, we would just show an ugly error message and don't give the user an action to do. Sign them out if we get the 'notSignedIn' error.

Demo

https://www.loom.com/share/76bd4fce2f7140fc929d82798d6310f6?sid=3b4d8953-ec62-4dd1-a0a1-639e4be6f945

Testing scenarios

• Sign in
• Close the tab
• Restart the server with new secret
• Follow an invite link

Final checklist

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• I have tested all cases I listed in the testing scenarios and I haven't found any issues or regressions
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• I added the label Skip Maintainer Review Indicating the PR only requires reviewer review and can be merged right after it's approved if the PR introduces only minor changes, does not contain any architectural changes or does not introduce any new patterns and I think one review is sufficient'
• PR title is human readable and could be used in changelog