Drives and folders can be shown as icons (pictures preview themselves),
a compact list, or a details table with type and date, remembered per
page. Per-item actions move into a ⋯ menu so rows fit a narrow panel.
In the 400 px Theseus sidebar the navigation folds into a compact bar
with the page name, the s3d status and a menu button, so the page gets
the room. The Widen button is gone: widening squeezed the open tab and
the right sidebar. Full page opens Pithos as an ordinary tab instead.
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