* fix: zone grid snapping, shelf position panel, deselect on item placement
- Zone tool reads the editor's gridSnapStep (0.5/0.25/0.1/0.05) instead
of a hardcoded 0.5 for both cursor move and click snapping.
- Shelf inspector gains a Position group (vec3 X/Y/Z sliders), matching
the item panel.
- Item catalog clears the viewer selection before arming placement so
shortcuts (rotate & co) don't hit both the ghost and the selected node.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
* refactor: move level display naming into @pascal-app/core
getDefaultLevelName / getLevelDisplayName ("Ground Floor" / "Floor N" /
"Basement N") lived in packages/editor's internal lib, so viewer-only
surfaces couldn't reach them and fell back to hand-rolled "Level N"
labels. The helpers are pure domain logic, so they move to core and
export from its barrel; the editor package's seven call sites now import
them from there.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Co-authored-by: Claude Fable 5 <noreply@anthropic.com>
