feat: per-import translation toggle and language picker in studio

Furni imports can now choose whether to translate (per import) and which
languages to build, instead of always rebuilding all 13 FurnitureData_<lang>
files. The studio header also has a global switch that persists the
furnidata_translate_enabled setting, seeding the per-import default.

src/app/api/admin/import/furni/route.ts

@@ -527,11 +527,24 @@ export const POST = withAdmin(
 			const { catalogNameFixed, haveOfferFixed, costCreditsFixed } =
 				await fixDatabaseConsistencyAfterImport();
 
-			// Rebuild all localized furnidata files (best effort)
+			// Rebuild localized furnidata files (best effort). `translate: false`
+			// skips entirely; `translate: true` forces a build even when the global
+			// setting is off; undefined falls back to the global setting. An optional
+			// `langs` array restricts which languages are rebuilt.
 			let languages: Awaited<ReturnType<typeof buildLocalizedFurniDataFiles>> =
 				[];
 			try {
-				languages = await buildLocalizedFurniDataFiles();
+				if (body.translate !== false) {
+					const langs = Array.isArray(body.langs)
+						? (body.langs as unknown[]).filter(
+								(l): l is string => typeof l === "string",
+							)
+						: undefined;
+					languages = await buildLocalizedFurniDataFiles(
+						body.translate === true,
+						langs,
+					);
+				}
 			} catch (err) {
 				console.warn(
 					"[import-furni] Localized furnidata build failed:",
@@ -638,14 +651,24 @@ export const POST = withAdmin(
 		// Verify + fix interaction_modes_count (single consolidated pass)
 		const verification = await verifyAndFixInteractionModesCount();
 
-		// Patch localized furnidata files for this single furni (best effort)
+		// Patch localized furnidata files for this single furni (best effort).
+		// Same `translate` / `langs` contract as the batch path above.
 		let languagesPatch: Awaited<
 			ReturnType<typeof patchLocalizedFurniDataEntries>
 		> = [];
 		try {
-			languagesPatch = await patchLocalizedFurniDataEntries([
-				{ classname, name, description: description ?? "" },
-			]);
+			if (body.translate !== false) {
+				const langs = Array.isArray(body.langs)
+					? (body.langs as unknown[]).filter(
+							(l): l is string => typeof l === "string",
+						)
+					: undefined;
+				languagesPatch = await patchLocalizedFurniDataEntries(
+					[{ classname, name, description: description ?? "" }],
+					body.translate === true,
+					langs,
+				);
+			}
 		} catch (err) {
 			console.warn(
 				"[import-furni] Localized patch failed:",