Logs Panel: display column names when using displayed fields with columns

When: - Line wrapping is disabled - Columns are enabled - Displayed fields are used We don't show column names anywhere. If the user wants to see which fields corresponds to which value, they can either correlate the column with the field, or move the mouse over the value to see the field name, for example: <img width="200" height="84" alt="Image" src="https://github.com/user-attachments/assets/56489802-7b62-49c7-a0ad-b83555d82b2f" /> We could explore a better way to surface field names, helping users make sense of the displayed values.