fix: Do not display QR code for large secrets

[jhaals]

Will not render QR code above 500 letters.
Fixes #2810

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.04%. Comparing base (9af2e37) to head (c2b1993).
Report is 56 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2829   +/-   ##
=======================================
  Coverage   71.04%   71.04%           
=======================================
  Files           8        8           
  Lines         670      670           
=======================================
  Hits          476      476           
  Misses        163      163           
  Partials       31       31           

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