Add settings page for managing forecasting API key and URL via UI

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

frontend/node_modules/es-toolkit/dist/math/median.js

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+//#region src/math/median.ts
+/**
+* Calculates the median of an array of numbers.
+*
+* The median is the middle value of a sorted array.
+* If the array has an odd number of elements, the median is the middle value.
+* If the array has an even number of elements, it returns the average of the two middle values.
+*
+* If the array is empty, this function returns `NaN`.
+*
+* @param nums - An array of numbers to calculate the median.
+* @returns The median of all the numbers in the array.
+*
+* @example
+* const arrayWithOddNumberOfElements = [1, 2, 3, 4, 5];
+* const result = median(arrayWithOddNumberOfElements);
+* // result will be 3
+*
+* @example
+* const arrayWithEvenNumberOfElements = [1, 2, 3, 4];
+* const result = median(arrayWithEvenNumberOfElements);
+* // result will be 2.5
+*/
+function median(nums) {
+	if (nums.length === 0) return NaN;
+	const sorted = nums.slice().sort((a, b) => a - b);
+	const middleIndex = Math.floor(sorted.length / 2);
+	if (sorted.length % 2 === 0) return (sorted[middleIndex - 1] + sorted[middleIndex]) / 2;
+	else return sorted[middleIndex];
+}
+//#endregion
+exports.median = median;