Add early return in yTimeRange when yAmount <= 1 to prevent division by zero

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/module/setChartData.js

@@ -165,6 +165,7 @@ export function timeRange(minTime, maxTime, amount) {
  * @returns {Array<number>} An array of interpolated Y values.
  */
 export function yTimeRange(data, yAmount, yMax) {
+  if (yAmount <= 1) return data.map((d) => d.y);
   const yRange = [];
   const yGap = 1 / (yAmount - 1);