feat: implement intersection observer and viewability hooks for Optim… - #681
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…izedVideoPlayer visibility management
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closes #257
summary of the completed work
Optimized Video Player: Modified OptimizedVideoPlayer.tsx to accept an isVisible prop, pausing video playback and deactivating keep-awake screen locks when off-screen.
Scroll/Viewport Observation: Developed a new useIntersectionObserver hook to track components within standard ScrollView components using debounced offset measurements.
FlatList Observation: Developed a new useViewabilityCallback hook using stable ViewabilityConfig references to track items in FlatList without triggering parent re-renders.
Testing & Quality: Added full unit and integration test coverage (37 tests passing) and aligned code style with strict ESLint grouping rules.