Real-Time Notifications and Activity Feed System

Real-Time Notifications and Activity Feed System

Design a high-performance, real-time notification engine and activity feed for a modern collaborative web application. The design must address real-time ingestion patterns (such as SSE or WebSockets), client-side cache normalization, layout rendering optimizations (like windowing and layout thrashing prevention under peak loads), cross-tab synchronization of unread states, and comprehensive accessibility (WCAG) guidelines for dynamic alerts.
ReactTailwind CSSTypeScriptIndexedDBSSEBroadcastChannelWeb Workers
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