Data tab shows empty preview for wide Parquet files

Loading a Parquet file with many columns makes the Data tab render an empty Data Preview panel even though the file contains data.
**Steps to Reproduce:**
1) Open a wide Parquet file in the TUI.
2) Navigate to the Data tab.

<img width="1890" height="444" alt="Image" src="https://github.com/user-attachments/assets/53f8f8db-aa22-4d98-aa25-dd75df181410" />
