A short Unread list read through no longer says more to load (#385)

hasMore() compared nextOffset(), which on Unread counts only the loaded
items still unread, with S.total from the answer: once they were read it
was 0 against that total, so the page asked for a page that came back
empty and took its total, 0, with the items still on screen. Whether
more is left now comes from the last answer itself, its offset and items
against its total; reading takes an item off the server's list and off
nextOffset() alike, so what that answer said is left stays true.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

web/CHANGELOG.md

@@ -13,6 +13,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Fixed
 - Swiping, or j, through more than 50 items no longer stops at the 50th until a reload: the next ones are fetched as you near the end, and Load more on the Unread tab no longer skips as many unread items as you had read (#383).
+- On the Unread tab, a short list read through no longer asks the server for more that is not there, or shows a count of 0 items beside the items still on screen (#385).
 - ipx-web no longer logs a deprecation warning about its metrics setting at every start (#381).
 - A tap's time in the traces ends with the last answer to what it set off, not with a refresh made seconds later (#379).
 - Switching away from the page a minute after using it no longer stops it with "Maximum call stack size exceeded" (#378).