feat(studio): recover matching Nitro sources and persist import phases

src/lib/services/clone-import.ts

@@ -247,7 +247,7 @@ export function __resetItemsBaseAllocatorForTests(): void {
 export async function cloneSingleFurni(params: {
 	source: CloneSource;
 	entry: SourceFurni;
-	onProgress?: (status: string) => void;
+	onProgress?: (status: string) => void | Promise<void>;
 	/** Skip the per-item FurnitureData.json write and return the entry instead,
 	 *  so batch callers can append everything in one lock + write cycle. */
 	deferFurniData?: boolean;
@@ -291,7 +291,7 @@ export async function cloneSingleFurni(params: {
 	const { iconDir, nitroDir } = await getFurniAssetDirs();
 
 	// Download .nitro + icon directly from the source hotel.
-	onProgress?.("downloading");
+	await onProgress?.("downloading");
 	const nitroPath = getRuntimePath(
 		/*turbopackIgnore: true*/ nitroDir,
 		`${classname}.nitro`,
@@ -370,7 +370,7 @@ export async function cloneSingleFurni(params: {
 		}
 	}
 
-	onProgress?.("writing_db");
+	await onProgress?.("writing_db");
 	const stackHeight =
 		entry.canlayon || entry.cansiton ? 1.0 : entry.canstandon ? 1.0 : 0.0;
 	// allow_stack: derived from stackHeight (mirrors furni-import.ts `dims.z > 0`).
@@ -426,7 +426,7 @@ export async function cloneSingleFurni(params: {
 	// FurnitureData entry — reuse the source's furnitype object, but with our id
 	// AND our offerid. The source's offerid points at the source hotel's sprite
 	// ids, which would silently break the emulator's catalog offer lookup.
-	onProgress?.("writing_furnidata");
+	await onProgress?.("writing_furnidata");
 	const furniDataEntry = {
 		...entry,
 		id: newId,