* feat: add polygon movement support to editor and implement dedicated move tools for walls, slabs, and ceilings
* feat: add uv2 attribute to ceiling and slab geometries for lightmap support
* Fix curved wall miters and align roof position sliders
* Fix wall measurement label and extension anchors
* Fix WebGPU renderer initialization order
* fix(editor): scope wall movement to the selected level
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Co-authored-by: Pascal <open@pascal.app>
Major changes:
- Roof system rewrite with roof-segment support
- Scene store refactor
- Spatial grid improvements
- Item light system
- Post-processing and selection manager updates
- Perf monitor component
Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
