The layout's play-intent effect gated audioEl.play() on player.isPlaying
(state === 'playing'), but the state progression is loading → DOM play()
→ 'playing' event → state='playing'. Without calling play() during
loading, the DOM never starts, the event never fires, and state is
pinned to loading forever. Call play() for the intent-to-play union
(loading + playing), matching the store's design.