Feature enhancements with minor bug fixes #1
Description
I want to make a meaningful contribution by improving the calculator's functionality and fixing a few small issues I may find while exploring the code.
I plan to:
- add or enhance useful features,
- improve existing behavior where needed,
- and fix minor bugs or inconsistencies.
The exact changes will become clear as I work through the code.
I will open a pull request linked to this issue once the improvements are ready.