[Priveetee]

Summary

• Report playback progress to the server only while a video plays, plus once on pause, seek and stop, instead of every 15 seconds even while paused.
• Stop creating a SABR playback session for every video card that stays on screen for 200 ms. Once a list stops scrolling, the app prefetches only the stream details of the one or two most visible cards, and it creates the session when a card is tapped or long-pressed. A scroll cancels the press before any session is created.

Validation

• Android unit tests, lint, debug and release builds passed locally and in CI.
• The new progress and preload tests fail against the previous behavior.
• Card prewarm UI tests (tap confirms, scroll cancels, settled list prefetches the two most visible cards) passed on a physical phone (Android 14).
• On a phone emulator (API 34) with the previous build: scrolling the home feed created 5 SABR sessions and a 2-minute pause sent 8 progress reports. The new build was not measured on a device.