[PUI] Add image based QR code assigment

[matmair]

Follow up to #7939

This adds a button to scan codes for barcode linking.
I am not sure about the styling and would be thankful for feedback.

New look for barcode linking

Current look for general QR scans:

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[codecov]

Codecov Report

Attention: Patch coverage is 71.42857% with 2 lines in your changes missing coverage. Please review.

Project coverage is 83.51%. Comparing base (58f60d1) to head (bea0b1c).
Report is 23 commits behind head on master.

Files	Patch %	Lines
src/frontend/src/components/items/QRCode.tsx	66.66%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #7960      +/-   ##
==========================================
- Coverage   83.60%   83.51%   -0.10%     
==========================================
  Files        1136     1140       +4     
  Lines       50905    51009     +104     
  Branches     1758     1776      +18     
==========================================
+ Hits        42560    42600      +40     
- Misses       7899     7950      +51     
- Partials      446      459      +13     

Flag	Coverage Δ
pui	64.82% <71.42%> (-0.34%)	⬇️

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[wolflu05]

This already looks pretty good. I like that there is a select to use a different camera (this is pretty useful in safari to use the iPhone camera as a scanner).

I have to suggestions to improve the design.

1. make the stop button as high as the input field (I think there is an extra size type for the action button in mantine for this
2. make the input at the bottom full width and add the icon to the inputs left section.

Maybe this component can be also used later for the related model field to just input barcode data there.

[matmair]

I have adapted it to this:

Should we use this setup for all scanning purposes?

[matmair]

Ready for review and merge if @wolflu05 is happy

[SchrodingersGat]

@matmair looks good to me!

[wolflu05]

Thanks for the design adjustments. It looks great now.