j.foucher 11945e90d2 Add duplicate (Ctrl+D) and copy/paste (Ctrl+C/V) with undo support ...

Duplicate clones selected actors with a small offset and selects the copies.
Copy stores actor class and relative transforms in an internal clipboard.
Paste spawns clipboard contents in front of the camera preserving relative positions.
All operations are tracked by SpawnManager and fully undoable/redoable.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

2026-04-11 13:08:13 +02:00

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