Viewport-first item creation, asset category rail, and tiered terrain textures

Data Editor#

• Equip authoring in the viewport. Position a weapon or armour piece on the rigged preview with a Move/Rotate gizmo and see exactly what the client will draw. Transforms are stored as a base plus your delta, so re-finalising never double-bakes.
• Inventory-icon snapshots are captured from the viewport and carried into Finalize; the gizmo also works in icon mode.
• Create-page upgrades for items, animation bases and VFX; .obj drops convert with their textures and go through the import popup.
• Thumbnail captures can no longer show a stale frame, and VFX tiles join the lazy thumbnail pipeline.

Assets#

• Icon category rail in the Assets tab; every category gets the folder view.
• Linked-folder browsing survives very large asset stashes.
• Stale .gltf model paths resolve to their .scn siblings.

Terrain textures#

• Textures are stored as id-keyed tier files (128 / 256 / 1024) with PBR set packing, and round-trip the cloud as tier zips.
• Per-map texture quality survives saves and asset rescues.
• Texture libraries render cloud-style material-ball previews.

Fixes#

• All 3D preview viewports render in their own world, so one editor's preview can no longer leak into another's thumbnail.
• VFX saves no longer re-load model instances from the export cache.
• NPC skin binds carry bone names so the client's skeleton graft maps correctly.
• The default template is now the cleared ShowCase project.