Apply Biome lint fixes

src/lib/services/swf/conversion-worker.ts

@@ -31,21 +31,21 @@ if (parentPort) {
 		try {
 			if (msg.type === "convert") {
 				const result = convertSwfToNitro(msg.buffer, msg.classname);
-				parentPort!.postMessage({
+				parentPort?.postMessage({
 					id: msg.id,
 					ok: true,
 					result,
 				} satisfies WorkerResponse);
 			} else {
 				const icon = extractIconFromSwf(msg.buffer, msg.classname);
-				parentPort!.postMessage({
+				parentPort?.postMessage({
 					id: msg.id,
 					ok: true,
 					icon: icon ?? null,
 				} satisfies WorkerResponse);
 			}
 		} catch (err) {
-			parentPort!.postMessage({
+			parentPort?.postMessage({
 				id: msg.id,
 				ok: false,
 				error: (err as Error).message,