Actually pass card_params into ChatFeed's internal Card

[ahuang11]

Addresses https://github.com/Quansight/ragna/pull/261/files/716373b2e6d51c9a74c8065d2cf1414b87115981#diff-3caa7ff25182aa89f6a4e030b8004c8666a48de3c2d496008192393eec29b618R423

import panel as pn

pn.extension()

pn.chat.ChatFeed(
    "Hello",
    card_params={"header_background": "red", "header": "Test", "hide_header": False},
).show()

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (46e0639) 84.69% compared to head (ed8ef0f) 84.69%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6154      +/-   ##
==========================================
- Coverage   84.69%   84.69%   -0.01%     
==========================================
  Files         296      296              
  Lines       44184    44195      +11     
==========================================
+ Hits        37420    37429       +9     
- Misses       6764     6766       +2     

Flag	Coverage Δ
ui-tests	40.72% <23.07%> (-0.01%)	⬇️
unitexamples-tests	72.62% <100.00%> (+<0.01%)	⬆️

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