Calculator Improvements

[ILIYANGERMANOV]

What do you want to be added or improved?
As a user I want to have better UX when using the "Calculator" feature.

Is your request already listed in Issues?

• Yes, it already exists.
• No, it's a new issue.
• I'm not sure but I've checked.

Put an x in the boxes that apply.

• Demo: Checking checkbox using [x]

Explain with bullets why do you need it

• the current implementation isn't as convenient as it can be

Explain how do you imagine it in detail
Write any implementation details that might help us better fulfill your feature request.
I'd like to:

• prefill current amount when clicking the calculator
• add grouping separators when inputting larger amounts - e.g. "#,###.00"