Add overrides.image feature for card styles.

[dlongley]

No description provided.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 12.04%. Comparing base (cbd0bc3) to head (7b0401a).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #124   +/-   ##
=======================================
  Coverage   12.04%   12.04%           
=======================================
  Files           6        6           
  Lines          83       83           
=======================================
  Hits           10       10           
  Misses         73       73           

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