fix: filter access/refresh tokens exposed by Feather Client

[lunaynx]

Feather Client exposes tokens in the logs like this (redactions mine):

[13:12:52] [nioEventLoopGroup-3-1/DEBUG]: Rust Channel -> {"requestId":17,"callType":"callback","message":null,"success":{"accounts":[{"email":"","uuid":"[redacted]","name":"[redacted]","authToken":"[redacted]","expirationDate":"2026-03-23T17:11:36.289Z","refreshToken":"[redacted]"}]},"failure":null}

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