Function bar_chart 

pub fn bar_chart(value: f64, max: f64, width: usize) -> String

Render a horizontal bar chart using Unicode block characters.

value and max define the proportion. width is the bar length in chars. Returns filled (█) and empty (░) segments. Pure text — callers apply color via owo_colors for consistency.

Examples

let bar = bar_chart(50.0, 100.0, 10);
assert_eq!(bar.chars().count(), 10);