Issue 392 infinite virtual scroll

[T-kesh]

Closes #392 This PR implements InfiniteVirtualList, a highly optimized virtual infinite scroll list component designed to handle datasets scaling to 10,000+ items at a smooth 60fps with a constant native memory footprint. Built on top of React Native's FlatList with removeClippedSubviews={true} enabled, it recycles views beyond the active viewport and utilizes the getItemLayout engine to bypass expensive native item measurement steps. To guarantee high performance on older devices, it dynamically queries total system RAM via expo-device and dials down virtual list properties (windowSize: 3, maxToRenderPerBatch: 5) on systems with <2GB memory to eliminate JS thread lockups. It integrates seamlessly with the codebase's existing useMemoryMonitor hook, and comes fully tested with a comprehensive Jest test suite in tests/components/InfiniteVirtualList.test.tsx verifying performance metrics, bottom-reached triggers, loading indications, and memory scaling.

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[T-kesh]

@RUKAYAT-CODER kindly review