real-time chat application

build a feature-rich modern chat application that sets new standards for real-time communication. implement end-to-end encrypted messaging, high-quality video/audio calls, seamless file sharing with preview support, message translation, smart replies, custom emoji reactions, collaborative whiteboards, polls, and thread discussions. includes offline support with perfect sync, rich link previews, customizable notifications, and advanced search with filters. focus on accessibility and cross-platform consistency.