- F5: a chip's × pressed from the keyboard hands the focus to the next chip (else the previous one,
else what follows) before it unmounts — in DismissibleChip, so all five chip rows get it
(`focusNeighbour` in lib/useFocusKeeper).
- F4: a drag grip names what it lifts (`common.order.dragNamed`: panel groups, personal views);
the two generic "Drag to reorder" keys are gone.
- F6: the side panel's edge tab is out of the Tab order while the card covers it, names its panel,
and a keyboard pin moves the focus into the card.
- F7: Back to top is no Tab stop while hidden, and a keyboard press leaves the focus on the page.
peter
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