Tiger Trade - One stop trading

[New] Hong Kong stock single-leg options Demo Trading is now available, providing a risk-free practice environment that closely simulates the real market. Experience the complete trading process without using real funds. [New] The multi-column sliding mode of the watchlist supports horizontal browsing of more key data, helping users quickly compare and identify anomalies. [New] Topic Subscription aggregates news around major events and allows users to subscribe to topics of interest. When new or important updates occur, subscribed users receive timely notifications. Upgrades news consumption from single-article reading to event-level tracking, seize market trading opportunities. [New] Added support for subscribing to Hong Kong ETF IPOs directly in the app. [Optimization] Order rules for Singapore stocks in the Trade at Close (TAC) session have been optimized to improve execution efficiency. [Optimization] Enhanced interaction experience on the stock detail page, optimizing in-page navigation, time interval and indicator switching, and K-line update logic for smoother chart viewing.