PreviewView mounts its own arrow handlers via useHotkeys. The Timeline
also installed a window-level keydown listener for grid arrow nav, with
no viewMode check, so in preview mode BOTH handlers fired on every
arrow press and raced to call setActivePhoto. The grid handler walks
photoRows (grid cells) while preview walks the visible-order array,
and whichever store update landed last won, making preview nav land on
the wrong photo.
Telltale: Shift+arrow worked because PreviewView's plain useHotkeys
('left'/'right') doesn't match Shift+arrow, so only Timeline fired and
its visual-grid path got the right neighbor.
Fix: early-return Timeline's keyboard effect when viewMode !== 'grid'.
The listener stays attached to viewMode in the dep array so it
re-engages instantly on closePreview.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
dtoro
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