fix: catch FlareSolverr fallback errors in fetchSourceFurnidata

Previously, if FlareSolverr itself failed (timeout, connection error),
the error would propagate as generic 'network error'. Now it throws
a descriptive error message.

src/lib/services/clone-import.ts

@@ -104,7 +104,13 @@ export async function fetchSourceFurnidata(
 			body = await fetchWithFlareSolver(url);
 		}
 	} catch {
-		body = await fetchWithFlareSolver(url);
+		try {
+			body = await fetchWithFlareSolver(url);
+		} catch (err) {
+			throw new Error(
+				`FlareSolverr fallback failed for ${url}: ${(err as Error).message}`,
+			);
+		}
 	}
 	if (body.trimStart().startsWith("<")) {
 		throw new Error(