Previously the modal's aside was gated on `focusedPhotoQuery.data`, so
each arrow-skim unmounted the sidebar until the next photo's metadata
arrived — which reflowed the preview pane sideways. Now the aside is
always mounted while the modal is open; its contents swap between the
metadata panel and a small InlineLoader the same way the timeline's
right-aside does.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
dtoro
e1707c314d