add requirements-dev.txt

update requirements.txt

Fixed exception handling in the export function, now only catches OSError and IOError.

Added data export functionality, supporting CSV, JSON, and TXT formats; optimized the display of amount formatting.

Optimize data processing logic, simplify function parameters, and enhance input validation.

Move the main function call to the main module check.

update pylint

Refactor the event handling logic and simplify the event handling code in the main function.

Refactor Main Interface Update Logic

Change the title of the "Clear Bill" confirmation pop-up to "Clear".

Fixed the conditional statements in the main function to ensure that data is added only under specific conditions.

update bookkeeping.py

update main()

update main()

Refactor the main layout function, optimize variable naming, and fix data passing issues.