pub fn render_gauge(
frame: &mut Frame<'_>,
area: Rect,
label: &str,
index: usize,
length: usize,
)Expand description
Full-width level gauge mirroring the time bar. label is the current
level’s readout (CF coordinate label or the dimension-name fallback);
index/length position the fill. No-ops for zero-area or single-level
variables so the dashboard can call it unconditionally.