zenno: include rightmost endpoint in stat charts

zenno/src/lib/StatChart.svelte

@@ -39,7 +39,18 @@
 		plotOptions?: Omit<Plot.PlotOptions, 'marks' | 'x' | 'y'>;
 	}
 
-	let { stat, y = [], yArea = [], yLabel, range, xRange, xRule = [], yRule = [], class: className, plotOptions = {} }: Props = $props();
+	let {
+		stat,
+		y = [],
+		yArea = [],
+		yLabel,
+		range,
+		xRange,
+		xRule = [],
+		yRule = [],
+		class: className,
+		plotOptions = {},
+	}: Props = $props();
 
 	let width = $state(0);
 	let height = $state(0);
@@ -58,7 +69,7 @@
 		}
 		return 100 * Math.ceil(Math.max(1200, ...xLines) / 100);
 	});
-	const xVal = $derived(d3.range(xMin, xMax, 5));
+	const xVal = $derived(d3.range(xMin, xMax + 1, 5)); // +1 because d3.range does not include the max
 	const thrX = 1200;
 
 	const series = $derived([y].flat(1).filter((s) => s != null));