Fixes #2

Closes #6

Closes #3, #5, and #8

Closes #7

The PDS responds with an HTTP 400 code when using an expired auth token.
This won't trigger Ktor's token refresh, so we add a custom interceptor
to detect this failure and manually refresh the tokens.

This backs out commit a0c60e805fa3db56ad8fbaca3bdfbedc8d7addc1.

Closes #2

Closes #1

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