H1K0
1f3bc2acf4
Tapping a file in a pool did a full goto('/files/<id>') to the standalone
viewer route, whose close button always routes to /files — so returning from
a file viewed inside a pool dropped the user on the global files list instead
of back in the pool.
Open the viewer as an overlay over the still-mounted pool grid via shallow
routing, mirroring the files grid: pushState keeps the pool URL (the overlay
is driven by page.state.fileId), and the back button / close does
history.back(), returning to the pool with its list and scroll intact.
Neighbours follow the pool's own order, paging in more pool files near the
end, and closing scrolls the grid back to the last-viewed file.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>