Function emit_tray_popover_state 

fn emit_tray_popover_state(app: &AppHandle<Wry>, emit: &TrayPopoverEmit)

Set AUDIO_HAXOR_TRAY_DEBUG=1 in the environment to print every successful tray-popover-state / tray-popover-ui-theme emit to stderr (state includes the ~500 ms host poll). Emit failures always log.