make sure messages alternate with user/assistant roles

src/lib/components/InferencePlayground/InferencePlayground.svelte

@@ -128,14 +128,14 @@
 			const endTime = performance.now();
 			latency = Math.round(endTime - startTime);
 		} catch (error) {
+			if (conversation.messages.at(-1)?.role === "assistant") {
+				conversation.messages.pop();
+				conversation.messages = [...conversation.messages];
+			}
 			if (error instanceof Error) {
 				if (error.message.includes("token seems invalid")) {
 					hfToken = "";
 					localStorage.removeItem(hfTokenLocalStorageKey);
-					if (conversation.messages.at(-1)?.role === "assistant") {
-						conversation.messages.pop();
-						conversation.messages = [...conversation.messages];
-					}
 					showTokenModal = true;
 				}
 				if (error.name !== "AbortError") {