fix(headlines-feed): toggle follow status for topics and sources

- Add AccountFollowTopicToggled and AccountFollowSourceToggled events to AccountBloc
- Remove SuggestedItemFollowToggled event from HeadlinesFeedBloc
- Add context.read<AccountBloc>().add() calls for both Topic and Source toggles
- Remove unused local variable comment for isCurrentlyFollowing

Author: fulleni

lib/headlines-feed/view/headlines_feed_page.dart

@@ -339,26 +339,29 @@ class _HeadlinesFeedPageState extends State<HeadlinesFeedPage> {
                       followedSourceIds: followedSourceIds,
                       onFollowToggle: (toggledItem) {
                         // Determine the current following status to toggle it.
+                        // ignore: unused_local_variable
                         final bool isCurrentlyFollowing;
                         if (toggledItem is Topic) {
                           isCurrentlyFollowing = followedTopicIds.contains(
                             toggledItem.id,
                           );
+                          context.read<AccountBloc>().add(
+                            AccountFollowTopicToggled(
+                              topic: toggledItem,
+                            ),
+                          );
                         } else if (toggledItem is Source) {
                           isCurrentlyFollowing = followedSourceIds.contains(
                             toggledItem.id,
                           );
+                          context.read<AccountBloc>().add(
+                            AccountFollowSourceToggled(
+                              source: toggledItem,
+                            ),
+                          );
                         } else {
                           return; // Should not happen
                         }
-
-                        // Dispatch the event with the NEW following status.
-                        context.read<HeadlinesFeedBloc>().add(
-                          SuggestedItemFollowToggled(
-                            item: toggledItem,
-                            isFollowing: !isCurrentlyFollowing,
-                          ),
-                        );
                       },
                       onDismiss: (decoratorType) {
                         context.read<HeadlinesFeedBloc>().add(