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This commit introduces a lightweight, browser-based auction system. It consists of two main components that communicate in real-time using the `BroadcastChannel` API, enabling a serverless front-end experience: - `display.html`: The public-facing screen for attendees. It shows the current item, price with smooth animation, and deal announcements. It automatically generates a unique session ID. - `control.html`: The auctioneer's control panel. It uses the session ID from the display page to connect. It allows for managing the auction flow, including loading items from a CSV, starting bids, updating prices, and finalizing sales.