Small type cleanup

Author: mrubens

src/api/providers/xai.ts

@@ -65,7 +65,7 @@ export class XAIHandler extends BaseProvider implements SingleCompletionHandler
 			if (delta && "reasoning_content" in delta && delta.reasoning_content) {
 				yield {
 					type: "reasoning",
-					text: (delta.reasoning_content as string | undefined) || "",
+					text: delta.reasoning_content as string,
 				}
 			}