fix: analytics dashboard card styling

[cyl3x]

The analytics promotion card on the dashboard should be a real mt-card to align with all other cards in terms of design and sizing:

fixes shopware/shopware#10069

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 64.09%. Comparing base (501a3c7) to head (962aab8).

Additional details and impacted files

@@             Coverage Diff              @@
##              trunk      #97      +/-   ##
============================================
- Coverage     68.89%   64.09%   -4.81%     
============================================
  Files            35       27       -8     
  Lines          1061      713     -348     
  Branches        126      126              
============================================
- Hits            731      457     -274     
+ Misses          301      227      -74     
  Partials         29       29              

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