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New wake-lock.ts engine (sanctioned island, dependency-injected for tests): feature-detected navigator.wakeLock, silent no-op when unsupported or denied, and the spec-mandated force-release-on-hide → re-acquire-on-visible loop handled via the sentinel release event. The player acquires on play and releases on pause (sleep-timer fades ride the same path); the reader holds the lock for the session. Both gate on the keep_screen_awake preference — data-keep-awake on the player root, keepScreenAwake in readerInitExpr. Hidden-tab playback intentionally does not keep the screen awake: the spec forbids screen wake locks for hidden documents.