New Items in Feed bug

**Current Behavior**
A notification is being shown to the user that there are new items in the feed.
Although this is technically true, we are not showing certain items like generic transactions that we do not yet have rich support for.

**Expected Behavior**
When a user clicks "Refresh" there should be new items in the feed.
The bug fix could be to make sure that the new posts are ones we display to the user, when comparing if they are more recent than the currently shown post.

No files or tests are named. Start by tracing the feed refresh logic and the comparison that decides whether newer items exist; verify which transaction types are displayed. Done means the notification appears only when a refresh can show new feed items.

Written by the indexing model from the issue text.