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/view/com/feeds/ProfileFeedgens.tsx

@@ -163,7 +163,7 @@ export const ProfileFeedgens = React.forwardRef<
             a.px_lg,
             a.py_lg,
           ]}>
-          <FeedCard.Default type="feed" view={item} />
+          <FeedCard.Default view={item} />
         </View>
       )
     }