grabowski
540b37020c
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Groups: objects of type "group" draw nothing; members carry the group's id in a new `group` field (groups nest). A hidden group hides everything in it (Doc::hidden_in_groups, skipped by the driver), a locked one locks it in the Studio. Removing a group moves its members up into its parent group. isokit check warns about members of missing groups. New `order` op: the whole object order at once (each id once), one undo step. Studio object list as a tree in the document order, front first: each group sits just after its members, so it draws as one block, and ground pieces higher in the list lie on top. Groups fold open and shut; every row has an eye and a lock (shown on hover or when set); a click on a group selects all of it, so a drag on the map moves it all. Group / Ungroup (Ctrl+G, Ctrl+Shift+G), Order up/down (Ctrl+] Ctrl+[, with Shift to the front / back), drag rows above, below or into a group. Group panel: name, zoom, ungroup, to front / back, lock, hide, delete with contents. MCP: group field in the object schema, order op, guidance. Tests: Rust 81 (ops: groups, order, removal; driver: nested hidden groups), Studio 131, web 100.