Add enough polish to show someone

[ianjmacintosh]

• [x] Center the QR code and form (horizontally)
• [x] Stack the labels and fields
• [x] Make sure the QR code and form width fills the screen -- not overfills

[ianjmacintosh]

Make sure the width fills the space but doesn't OVERFILL https://github.com/soldair/node-qrcode?tab=readme-ov-file#width

[ianjmacintosh]

Make the form fields line up