Function render_code_block 

pub fn render_code_block(
    code: &str,
    lang: Option<&str>,
    ss: &SyntaxSet,
    width: usize,
) -> Vec<Vec<InlineSegment>>

Render a code block with syntect syntax highlighting.

width == 0 preserves the historical “no wrap” behavior so internal callers (and tests) that don’t pass a viewport still work. Any other value hard-wraps the highlighted output at display-width boundaries — LLMs frequently emit tables inside code fences, and the un-wrapped version overflowed the terminal before this parameter existed. Wrapping happens after syntax highlighting so each chunk keeps its token color; tabs expand to four spaces first to keep the math simple (syntect preserves tabs verbatim and a tab stop is variable).