Function extract_target_statement 

pub fn extract_target_statement(
    content: &str,
    lang_name: &str,
    target_line: u32,
    target_col: Option<u32>,
) -> Option<String>

Extract a compact, context-aware statement snippet around the target position.

• Preserves formatting/newlines (not whitespace-collapsed).
• Strips leading Rust attributes on the statement.
• Aggressively elides long block interiors with a placeholder to keep cards compact.