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* fix(frontend): keep the thread list offset past hidden side chats
Primary thread lists hide sidecar threads on the client, so a page of 50
visible chats can consume more server rows. fetchInfiniteThreadsPage kept
that server offset in a Symbol property on the page array, but TanStack
Query's structural sharing (replaceEqualDeep) rebuilds a changed array
without symbol keys, and the list cache writers (rename, unread, pin,
delete, upsert) rebuild pages with map/filter. After the first refetch or
cache write, getInfiniteThreadsNextPageParam fell back to the sum of the
visible page lengths, so the next page started at 50 instead of 53 and
re-fetched rows already loaded. The same fallback treated a full page
that lost a row to a local delete as the end of the list.
Each cached page is now { threads, hiddenCount, hasMore }. The next offset
is the sum of visible and hidden rows over the loaded pages, so local
deletes and inserts still move it with the server list, and the end of the
list comes from the server response rather than the page length.
useInfiniteThreads projects the pages back to thread arrays with select,
so list components are unchanged.
* test(frontend): pin the sidebar's next-page offset past side chats in E2E
Three side chats in the first 50 server rows push the sidebar's second
page to offset 53. After a rename through the sidebar menu, scrolling to
the sentinel must request offset 53, not 50. On main this test fails with
the request at offset 50.
* docs(changelog): reference #6702
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Co-authored-by: Willem Jiang <willem.jiang@gmail.com>