Fix bugs in ActivateExtensionCard

[BLoe]

What does this PR do?

• Fixes a broken styles reference
• Fixes the field name string value "config" --> "configId" set on AuthWidget
• Closes ActivateExtensionCard UI/UX issues #8057

Checklist

• Add tests and/or storybook stories
• Designate a primary reviewer - @grahamlangford @mnholtz

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.19%. Comparing base (bd8f4c3) to head (ed0fe3a).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #8091   +/-   ##
=======================================
  Coverage   73.19%   73.19%           
=======================================
  Files        1310     1310           
  Lines       40737    40737           
  Branches     7567     7567           
=======================================
+ Hits        29818    29819    +1     
+ Misses      10919    10918    -1     

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[twschiller]

Does this fix #8057, or will there be additional work required? Update: just now saw the Slack thread

[github-actions]

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[mnholtz]

Closes #8057