SimpleStockTracker

- Redesigned the home screen with a clearer portfolio summary, including Portfolio Value, Today’s performance, Total Return, and portfolio allocation by market. - Improved font scaling and layout responsiveness to better support different iPhone and iPad screen sizes and reduce text wrapping. - Redesigned holding cards to display current price, daily change, shares, average cost, holding value, and profit/loss more clearly. - Improved currency conversion handling to prevent incorrect portfolio values when an FX rate is unavailable. - Removed hard-coded foreign exchange fallback rates and improved handling of unavailable exchange-rate data. - Added ticker/company search to make adding stocks easier. - Added guidance for manually entering ISIN/symbol information when a security cannot be found through search. - Added System, Light, and Dark appearance options. - Improved JSON import and restore functionality with separate Merge and Restore/Replace options. - Added duplicate detection during portfolio import based on market and ticker/symbol. - Improved overall usability, data reliability, and portfolio presentation.