fix: flush stdout after queue_description to display tool information (#3156)

Fixes issue #3155 where tool descriptions (e.g., file paths) were not
displayed in permission prompts. The queue! macro buffers output, so
an explicit flush() is needed after queue_description to ensure the
buffered content is displayed before the permission prompt.

Author: yayami3

crates/chat-cli/src/cli/chat/mod.rs

@@ -3269,6 +3269,8 @@ impl ChatSession {
             .await
             .map_err(|e| ChatError::Custom(format!("failed to print tool, `{}`: {}", tool_use.name, e).into()))?;
 
+        self.stdout.flush()?;
+
         Ok(())
     }