Fix division by zero in timeRange when amount is 1

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

src/module/setChartData.js

@@ -142,6 +142,7 @@ export function setBarChartData(baseData) {
  *   values in seconds.
  */
 export function timeRange(minTime, maxTime, amount) {
+  if (amount <= 1) return [Math.round(minTime)];
   // The X-axis (time axis) range is max - min; accumulate intervals from min to max by index
   const startTime = minTime;
   const endTime = maxTime;