Move functions to outer scope for clarity (S7721)

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

src/module/setChartData.js

@@ -155,6 +155,24 @@ export function timeRange(minTime, maxTime, amount) {
   timeRange = timeRange.map((value) => Math.round(value));
   return timeRange;
 }
+/**
+ * Cubic Bezier curve formula.
+ * @param {number} t - The interpolation parameter (0 to 1).
+ * @param {number} a1 - Control point 1.
+ * @param {number} a2 - Control point 2.
+ * @param {number} a3 - Control point 3.
+ * @param {number} a4 - Control point 4.
+ * @returns {number} The interpolated value.
+ */
+function threebsr(t, a1, a2, a3, a4) {
+  return (
+    (1 - t) * (1 - t) * (1 - t) * a1 +
+    3 * t * (1 - t) * (1 - t) * a2 +
+    3 * t * t * (1 - t) * a3 +
+    t * t * t * a4
+  );
+}
+
 /**
  * Generates smooth Y-axis values using cubic Bezier interpolation
  * to produce evenly spaced ticks matching the X-axis divisions.
@@ -169,16 +187,6 @@ export function yTimeRange(data, yAmount, yMax) {
   const yRange = [];
   const yGap = 1 / (yAmount - 1);
 
-  // Cubic Bezier curve formula
-  const threebsr = function (t, a1, a2, a3, a4) {
-    return (
-      (1 - t) * (1 - t) * (1 - t) * a1 +
-      3 * t * (1 - t) * (1 - t) * a2 +
-      3 * t * t * (1 - t) * a3 +
-      t * t * t * a4
-    );
-  };
-
   for (let j = 0; j < data.length - 1; j++) {
     for (let i = 0; i <= 1; i += yGap * 11) {
       yRange.push(