`media`

The active media player, over MPRIS: every org.mpris.MediaPlayer2.* on the session bus, the one playing (the latest to start) chosen, else the latest to pause, unless one was picked with p.select(), which holds until that player leaves or another starts playing; players lists them all. Its position is carried forward from the player's last report at its rate, never asked for again (no polling), and only while a visible reader shows it.

Field	Type
`playing`	`bool`	Something is playing.
`title`	`text?`	The track's title.
`artist`	`text?`	The track's artist.
`album`	`text?`	The track's album.
`art`	`text?`	The album art: `image media.art { fit: cover }`. Local art (a `file://` URL or a path) as the player sent it; remote (`https://`, `http://`) art fetched and shown as a file once it is in. Null when the player sent none, while remote art loads, or when it failed, so `media.art ?? "audio-x-generic"` falls back.
`position`	`float rw`	Fraction of the track played, 0 to 1. Writable: a scrubber's `slider { value: <-> media.position }` seeks the player (MPRIS `SetPosition`, or `Seek` when the track has no id). A player that cannot seek, or a track of unknown length, keeps its place.
`elapsed`	`duration`	Time played.
`length`	`duration?`	The track's length, when known.
`player`	`text?`	The active player's name, such as `Firefox` or `mpv`; null when no player runs.
`can_next`	`bool`	The active player can skip to the next track (MPRIS `CanGoNext`): `opacity: media.can_next ? 1 : 0.4`. False when no player runs or it takes no control (`CanControl` false).
`can_previous`	`bool`	The active player can go back to the previous track (`CanGoPrevious`, as `can_next`).
`can_seek`	`bool`	Writing `position` seeks: the active player can seek (`CanSeek`, as `can_next`) and the track's length is known.
`players`	`[Player]`	Every player running, keyed by its bus name (`for p in media.players key p.id { … }`): a switcher, a card per player. The one `media.*` follows is `active`; `p.select()` picks another. Read only while a visible reader reads it; its playing players' times tick once a second then.

Method
`action play_pause()`	Plays or pauses.
`action next()`	Skips to the next track.
`action previous()`	Goes back to the previous track.