Function render_template_highlighted 

pub fn render_template_highlighted(
    frame: &mut Frame<'_>,
    area: Rect,
    text: &str,
    scroll_offset: usize,
    title: &str,
    is_active: bool,
)

Render template text with format-aware syntax highlighting. Detects JSON (starts with { or [) and uses JSON highlighting; everything else uses YAML highlighting.