feat(catalog): generate derived scale 32 with preview and backup restore

src/app/api/admin/import/furni/nitro-editor/route.ts

@@ -105,15 +105,23 @@ export const PUT = withAdmin(
 		if (!existsSync(/*turbopackIgnore: true*/ nitroPath))
 			return apiError("Nitro file not found", 404);
 
-		// 1. Read existing .nitro to extract PNG
-		const existingBuffer = await fs.readFile(
-			/*turbopackIgnore: true*/ nitroPath,
-		);
-		const { png } = parseNitroBundle(existingBuffer);
-
-		// 2. Rebuild .nitro with updated JSON + same PNG
-		const newBundle = createNitroBundle(metadata, png, base);
-		await fs.writeFile(nitroPath, newBundle);
+		const saved = await withFurniDataLock(async () => {
+			const existingBuffer = await fs.readFile(nitroPath);
+			const { png, json: currentMetadata } = parseNitroBundle(existingBuffer);
+			if (
+				JSON.stringify(currentMetadata.catalogStudio) !==
+				JSON.stringify(metadata.catalogStudio)
+			)
+				return false;
+			const newBundle = createNitroBundle(metadata, png, base);
+			await fs.writeFile(nitroPath, newBundle);
+			return true;
+		});
+		if (!saved)
+			return apiError(
+				"The bundle changed. Reopen the editor before saving.",
+				409,
+			);
 
 		// 3. Extract dimensions from metadata
 		const dims = metadata.logic?.model?.dimensions || { x: 1, y: 1, z: 0 };