[Feature request]Add available disk space size display to the print file interface

Currently, it only shows the percentage, and the actual storage space situation cannot be seen; and it is hoped that you can long press or slide to delete the selected print file.

Start at the print file interface and inspect how it currently calculates and displays storage percentage and handles file selection. Confirm the available disk size can be shown and that a selected print file can be deleted by long-press or sliding, then verify both interactions on the device.

Written by the indexing model from the issue text.