feat: add gear and weapon renders

docs/DESIGN_SYSTEM.md

@@ -1047,6 +1047,20 @@ full-width band. Keep destructive archive controls isolated on the left side of
 the action bar and use the established `.moderation-action.danger` treatment;
 save and cancel remain grouped on the right.
 
+### Weapon and gear renders
+
+Weapon and gear editors offer an optional item-render upload separate from the
+icon system. Operators may save a definition without artwork, then add, replace,
+or remove the render in a later edit. The upload accepts JPEG, PNG, WebP, and
+AVIF up to 5 MiB. The server center-crops each upload to 1000 × 1000 and stores
+it as WebP. It does not call remove.bg, trim the scene, or add transparency.
+
+Show the current square render in the upload control and as a compact square
+thumbnail before the item name in ISAC registry rows. Keep the image decorative
+when the adjacent text identifies the item. The control states the crop and
+format contract so contributors do not confuse a render with a transparent
+game-data icon.
+
 Archived records that support restoration replace their destructive archive
 control with a green outlined `.moderation-action.restore` control in the same
 left-side position. The label must explicitly say “Unarchive” or “Restore”;