Duplicate and copy/paste Rotate structures (not only preview) Nudge with arrow keys (both on preview and placed structures) --- Maintainer triage (2026-01-15) Order: 4/16 Impact: High Estimate: M Tags: priority:P1, keyboard, ux Summary: Add power-user shortcuts: duplicate/copy-paste, nudge selection, rotate placed structures. Notes: Current shortcuts cover tool switching, zoom, undo/redo, and preview rotation. No copy/paste/duplicate, no arrow-key nudge, and no rotate for already-placed structures. State already supports multi-select + move; keyboard can build on that + add rotate/duplicate actions with collision/bounds checks.