Summarize: what three problems were found and fixed in the application?

The following three key issues were identified and fixed in the application:

1. Memory leak when working with dynamic components — optimized the cleanup of event listeners and destruction of components, which improved performance and reduced browser load.

2. Incorrect error handling during data loading — added centralized error handling with user notification, which increased stability and UX.

3. Interface responsiveness issues on mobile devices — redesigned styles and display logic to ensure proper display and usability on various screens.