Bring the open-source standalone editor closer to the community editor's
v2 sidebar without pulling in any preset/catalog infrastructure.
- Add a preset-less Build tab (apps/editor) that mirrors the community
Build sidebar: wall, fence, slab, ceiling, roof, stair, elevator,
door, window, column, spawn, plus the material-paint panel. Clicking a
type activates the raw structure tool drawn with the kind's defaults.
- Wire the Build tab into both editor mount points (local + saved scene)
and give the left rail proper image icons (Scene/Build/Items/Settings)
instead of letter fallbacks.
- Gate the ItemsPanel Library/Community/Mine source chips and tag filter
rows behind `showSourceFilter` / `showTagFilters` props (default true,
so community and external consumers are unchanged). The standalone
editor passes both off, leaving plain category tabs + full-width search.
Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>
