feat(video): hold a Screen Wake Lock while a video is open

Purely additive and isolated from the streaming/transport code: touches no
DataChannel, SourceBuffer, or playback state, so it cannot itself cause a
stall or regress existing playback (PC/Electron included) — feature-detected
and try/caught, a no-op wherever unsupported or refused.

Sidesteps the commonest real-world trigger for the WebRTC-drop recovery
(the phone auto-locking on its own idle timer while someone just watches).
Does nothing for a deliberate power-button lock or backgrounding the tab —
released automatically in both cases per spec — so the reconnect path is
still what handles those.

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