H1K0
f8f58434d5
Opening a file now snapshots the grid (loaded pages, cursor, scroll offset, opened id) into a shared store, and the viewer derives prev/next from that list instead of a separate anchored request. Returning to the grid restores the cached list and scroll-centres the last-viewed file rather than reloading page 1 from the top. This also fixes two issues: - The viewer's "previous" arrow never appeared: the backend anchor window is forward-inclusive, so the anchor was always item 0 and prev was null. Neighbors now come from the cached list, so paging is symmetric. - Paging forward in the viewer prefetches further pages into the snapshot, so navigation continues past the initially loaded set and the grid still restores correctly. A deep link straight to a file (empty cache) falls back to the anchored API window as before. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>