Connects MDBList through its OAuth device-code grant, registered as a Device Code app so no client secret or redirect URI ships in the binary and TV, mobile and desktop all use the same flow. MDBList omits `verification_uri_complete`, but its device page seeds the code field from a `user_code` query parameter and the sign-in redirect preserves the query string, so the activation link is built locally and the dialog's open button lands on a filled-in form instead of an empty one. A server-supplied complete URL still wins if one ever appears. Poll state is read from the response body rather than the status code: `authorization_pending` and `slow_down` both arrive as HTTP 400, and a missing grant answers 404 `device_not_found`. Writes go out as real-time `/scrobble/*` reports plus `/sync/watched` for the marks that never pass through the player, with ratings on `/sync/ratings`. Matching uses IMDb and TMDb only — MDBList's id block has no `tvdb` field, so a TVDB-only item is skipped rather than written under an empty id block.
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