Do not propagate clicks on input elements in Card header

[philippjfr]

Fixes #7045

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 13 lines in your changes missing coverage. Please review.

Project coverage is 72.48%. Comparing base (7c90f7b) to head (af9fa5c).
Report is 2 commits behind head on main.

Files	Patch %	Lines
panel/tests/ui/layout/test_card.py	0.00%	13 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (7c90f7b) and HEAD (af9fa5c). Click for more details.

HEAD has 3 uploads less than BASE

Flag	BASE (7c90f7b)	HEAD (af9fa5c)
	8	5

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7057      +/-   ##
==========================================
- Coverage   81.79%   72.48%   -9.31%     
==========================================
  Files         326      325       -1     
  Lines       48350    48393      +43     
==========================================
- Hits        39546    35079    -4467     
- Misses       8804    13314    +4510     

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