fix: clarify popup text and form fields in import UI - fix Italian copy in nitro editor, use shared CloneSource interface, make nitro/icon fields optional

src/app/admin/import/furni/nitro-editor-dialog.tsx

@@ -339,7 +339,7 @@ export function NitroEditorDialog({
 									{colorCount > 0 && (
 										<Badge variant="outline" className="text-[10px] gap-1">
 											<Palette className="w-2.5 h-2.5" />
-											{colorCount} colori
+											{colorCount} colors
 										</Badge>
 									)}
 									{animCount > 0 && (
@@ -491,7 +491,7 @@ export function NitroEditorDialog({
 									<Compass className="w-4 h-4 text-muted-foreground" />
 									<h3 className="text-sm font-medium">Directions</h3>
 									<span className="text-xs text-muted-foreground ml-auto">
-										{directions.length} attive
+										{directions.length} active
 									</span>
 								</div>
 								<div className="flex items-center justify-center">
@@ -541,7 +541,7 @@ export function NitroEditorDialog({
 							<section className="rounded-lg border bg-card p-4">
 								<div className="flex items-center gap-2 mb-3">
 									<Eye className="w-4 h-4 text-muted-foreground" />
-									<h3 className="text-sm font-medium">Tipo</h3>
+									<h3 className="text-sm font-medium">Types</h3>
 								</div>
 								<div className="grid grid-cols-2 gap-3">
 									<div>
@@ -663,7 +663,7 @@ export function NitroEditorDialog({
 										<Palette className="w-4 h-4 text-muted-foreground" />
 										<h3 className="text-sm font-medium">Colori</h3>
 										<Badge variant="secondary" className="text-[10px] ml-auto">
-											{colorCount} varianti
+											{colorCount} colors
 										</Badge>
 									</div>
 									<div className="space-y-3">
@@ -672,7 +672,7 @@ export function NitroEditorDialog({
 												<div key={colorId} className="rounded-md border p-3">
 													<div className="flex items-center gap-2 mb-2">
 														<span className="text-xs font-medium">
-															Variante #{colorId}
+															Color Variant #{colorId}
 														</span>
 														{/* Color preview dots */}
 														<div className="flex gap-1 ml-auto">