Live QA harness

Browser-oriented drag/drop check surface

Use this page to manually verify the published interaction: drag by the :: handle, move fields between zones, and confirm the mirror below always matches the visual layout.

Asset version: v20260502-dnd1

Checklist

Move a field from Available fields into Rows.
Move a field from Columns into Rows and confirm Columns updates immediately.
Move a field back to Available fields and confirm the drop hint returns when a zone becomes empty.
Open a field filter via the triangle and confirm it does not start dragging.

Observed state

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