feat(prompt): add support for wide characters in prompt preview

src/prompts/workflow.rs

@@ -606,7 +606,11 @@ mod tests {
         let workflow = CommitWorkflow::with_prompts(mock_executor, mock_prompts);
         let result: Result<(), Error> = workflow.run().await;
 
-        assert!(result.is_ok(), "expected workflow to succeed, got: {:?}", result);
+        assert!(
+            result.is_ok(),
+            "expected workflow to succeed, got: {:?}",
+            result
+        );
 
         let messages = workflow.executor.describe_messages();
         assert_eq!(messages.len(), 1, "expected exactly one describe() call");