[1.6.2] Improve editing of amounts

The existing calculator-like button input method significantly hinders user experience, as it prohibits basic text manipulation and functions such as copy and paste.

Users, including myself, often need to transfer financial data from statements directly into the app, and the inability to do so is a substantial inconvenience. To resolve these issues, I am requesting the implementation of regular text input editing features, such as the ability to copy and paste amounts into the input field.

This enhancement is critical for improving efficiency and user satisfaction. Thank you for considering this request, and I look forward to the improved functionality.