fix: enhance error handling in downloadFile function with detailed response information

Author: AdriGeorge

src/helpers.ts

@@ -34,7 +34,21 @@ export async function downloadFile(
 ): Promise<DownloadResponse> {
 	const response = await fetch(url);
 	if (!response.ok) {
-		throw new Error("Response error.");
+		let responseText = "";
+		try {
+			responseText = await response.text();
+		} catch {
+			responseText = "";
+		}
+		const details = [
+			`status=${response.status}`,
+			`statusText=${response.statusText || "unknown"}`,
+		];
+		if (responseText) {
+			details.push(`body=${responseText.slice(0, 500)}`);
+		}
+		details.push(`url=${url}`);
+		throw new Error(`Response error. ${details.join(" ")}`);
 	}
 
 	const defaultName = !isNaN(index) && index > -1 ? `file_${index}.out` : 'file.out'