FeedCard & ListCard cleanups (#4644)

* Extract ListCard from FeedCard

* Export FeedCard.Action and optionally include in ListCard

* Remove list dual usage from most of FeedCard

* Update usages of FeedCard and ListCard

* Add back list purpose logic

* Make Action comp easier to use, clarify list purpose

* Rename Action to SaveButton

src/components/StarterPack/Main/FeedsList.tsx

@@ -45,7 +45,7 @@ export const FeedsList = React.forwardRef<SectionRef, ProfilesListProps>(
             (isWeb || index !== 0) && a.border_t,
             t.atoms.border_contrast_low,
           ]}>
-          <FeedCard.Default type="feed" view={item} />
+          <FeedCard.Default view={item} />
         </View>
       )
     }