Change QR code styles

[maribedran]

One-line summary

Use the colored Firefox logo and circles for the QR Code modal button.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.61%. Comparing base (5a152ec) to head (3ea2148).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1629   +/-   ##
=======================================
  Coverage   87.61%   87.61%           
=======================================
  Files         156      156           
  Lines       10816    10816           
=======================================
  Hits         9476     9476           
  Misses       1340     1340           

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