Use G3Status for /run command output

Change from custom emoji format to consistent g3: status message:
'g3: running <path> ... [done]'

crates/g3-cli/src/interactive.rs

@@ -462,7 +462,8 @@ async fn handle_command<W: UiWriter>(
                         if prompt.is_empty() {
                             output.print("❌ File is empty.");
                         } else {
-                            output.print(&format!("📄 Running prompt from: {}", file_path));
+                            G3Status::progress(&format!("running {}", file_path));
+                            G3Status::done();
                             execute_task_with_retry(agent, prompt, show_prompt, show_code, output).await;
                         }
                     }