Correctly display checksum and buttons

[xavierfacq]

This PR correct:

• problem of alignment reported here: [issue-3221] Pb when checksum is not available #3237 (comment)
• support of typo between sha256 and sha265, reported here: Incorrect SHA shown for Red Hat marketplace binary #3221 (comment)

Checklist

• npm test passes

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.45%. Comparing base (2c00908) to head (6092651).
Report is 8 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3259   +/-   ##
=======================================
  Coverage   99.45%   99.45%           
=======================================
  Files          90       90           
  Lines        4770     4770           
  Branches      635      637    +2     
=======================================
  Hits         4744     4744           
  Misses         26       26           

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