The tab strip needs to say how many series have an unread chapter without
the user opening the tab to find out, so listView carries the number
alongside the filtered items.
The count is taken over the whole reading set rather than the rendered
items, so it means the same thing on every tab instead of collapsing to
len(Items) on Updated and 0 everywhere else. Archived and finished are
excluded, matching what the Updated tab itself shows.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
sulthan
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