//! File system operations and utilities.
//!
//! This module provides file system utilities for the image optimizer including:
//!
//! - **Image scanning**: Discovering image files in directories with extension filtering
//! - **Backup management**: Creating backup copies of original files
//! - **Output management**: Ensuring output directory structure exists
//! - **Size calculations**: Computing resize dimensions while preserving aspect ratio
//! - **Byte formatting**: Converting byte counts to human-readable format
pub use create_backup;
pub use format_bytes;
pub use scan_images;
pub use ensure_output_dir;
pub use calculate_resize_dimensions;