Function file_progress_bar 

pub fn file_progress_bar(total_bytes: u64, operation: &str) -> ProgressBar

Create a progress bar for a file operation that is conditionally visible.

The progress bar is hidden (no terminal output) when:

• total_bytes is below LARGE_FILE_THRESHOLD (10 MB), or
• stdout is not a TTY (e.g. when piped to another process or script).

For large files on a TTY the bar shows bytes transferred, rate, and ETA, matching the style used across all other IPFRS file operations.

Arguments

• total_bytes – Total expected size of the transfer in bytes.
• operation – Short verb shown at the start of the bar line (e.g. "Adding", "Downloading").