use only original/large imges for covers/artist

fix view artist from context menu
add loading indicators to song list and artist views (show info we have right away)

app/components/BackgroundHeaderFlatList.tsx

@@ -37,7 +37,7 @@ function BackgroundHeaderFlatList<ItemT>(props: BackgroundHeaderFlatListProp<Ite
         </props.BackgroundComponent>
       }
       ListHeaderComponentStyle={[headerStyle]}
-      ListEmptyComponent={<NothingHere style={styles.nothing} />}
+      ListEmptyComponent={props.ListEmptyComponent || <NothingHere style={styles.nothing} />}
     />
   )
 }