Fix VO label for sleep timer

[GianniCarlo]

Bugfix

• After activating the sleep timer, VoiceOver users couldn't tell if the sleep timer was actually turned on

[Copilot]

Pull request overview

Improves the Player’s sleep timer accessibility so VoiceOver users can hear whether the sleep timer is active and what it’s set to.

Changes:

• Plumbs a new sleepAccessibilityLabel from PlayerViewModel into MediaActionRow.
• Updates MediaActionRow’s accessibility label logic to use the sleep timer’s state-aware text when applicable.
• Extends PlayerViewModel’s SleepTimerState subscription to publish both a visual timer label (sleepText) and a VO-specific label (sleepAccessibilityLabel).

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
BookPlayer/Player/Views/PlayerView.swift	Passes the new sleep timer accessibility label into the action row.
BookPlayer/Player/Views/MediaActionRow.swift	Adjusts accessibility label selection for the timer action to reflect state.
BookPlayer/Player/ViewModels/PlayerViewModel.swift	Publishes a dedicated VO label for sleep timer state changes.

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[Copilot]

For .timer, accessibilityText returns only sleepAccessibilityLabel (e.g., “Sleeping in 5 minutes”). That can be ambiguous in a row of multiple actions because the control’s name (“Sleep Timer”) is no longer announced. Consider keeping the label as ma.accessibilityLabel and exposing the dynamic state via .accessibilityValue, or concatenating the base label + state so VoiceOver always identifies the control.

Suggested change

	return sleepAccessibilityLabel ?? ma.accessibilityLabel
	if let sleepAccessibilityLabel {
	return "\(ma.accessibilityLabel), \(sleepAccessibilityLabel)"
	} else {
	return ma.accessibilityLabel
	}