Playback position now crosses the IPC boundary in milliseconds. Ticks survive only inside Rust (DB storage, Jellyfin API) and at the genuine remote-session boundary (session seek / transfer / RemoteControls). Rust command signatures (ms in, converted to ticks internally): - storage_update_playback_progress / _context: position_ms - repository_report_playback_start / _progress / _stopped: position_ms - PlaybackProgress.position_ticks -> position_ms (converted in the query) Frontend: - playbackReporting, playerEvents, VideoPlayer, Queue, player/[id] resume: seconds*1000 / durationMs/1000 instead of tick math. - repository-client + syncService param names -> positionMs. - Tests updated to ms fixtures/assertions. Out of scope (legitimately ticks): NowPlayingItem, PlayState.positionTicks, sessionSeek, playbackModeTransferToLocal, RemoteControls, SessionCard — the remote Jellyfin session API. Rust 456, frontend 644, check clean.