feat(card): convert card-content to shadow DOM #30759
                
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Issue number: internal
What is the current behavior?
Card content has no encapsulation.
What is the new behavior?
Convert
ion-card-contentto Shadow DOM which improves consistency among components & CSP compatibility.Does this introduce a breaking change?
There should not be any breaking changes related to targeting inner elements since
ion-card-contentdoes not have any internal elements of its own. However, some user styles may break due to the removal of thecard-content-{mode}class or changes in selector specificity.