Add realm currency calculator

[ysc3839]

Screenshot:

[luaneko]

I made some improvements to your PR:

• Some UI improvements
• Fixed textbox not being dynamically sized
• Abstracted away textbox autosize logic from the calculator for code reuse
• Added an estimator and a clear button
• Ensured all inputs are validated and clamped in the possible ranges

If everything looks good after reviewing, please mark it as approved and I will merge!

[Primajin]

Nice, really looking forward to this 🚀

[ysc3839]

please mark it as approved

I can't find an "approve" button. Are you just asking if I approve these changes? This is your project, so I have no question with your changes.

[luaneko]

I can't find an "approve" button.

I'm talking about "Approve Changes" button in the review pull request page. If you can't find it, no worries.

Are you just asking if I approve these changes? This is your project, so I have no question with your changes.

It doesn't hurt to have multiple reviewers even if it's the owner's code. I can make mistakes and introduce bugs too ;)