- IconPicker replaces the three icon selects (rail icon, icon-widget rule,
"Otherwise"): the glyphs in a grid, and a button that clears back to none —
which a Radix SelectItem could never offer.
- ModePicker/StylePicker drop out in favour of a shared ui/Segmented, the same
sliding-thumb shape RangePicker and the widget-side control already wear.
- PanelRail draws no scrollbars at all: hiding them also takes back the gutter
a vertical bar claimed from a column exactly as wide as its buttons, which is
what pushed a horizontal bar under them.
- The panels dialog can re-pair one screen (POST /panels/{id}/unpair) without
deleting the panel it hangs on.