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/compat/array/difference.mjs

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+import { difference as difference$1 } from "../../array/difference.mjs";
+import { isArrayLikeObject } from "../predicate/isArrayLikeObject.mjs";
+//#region src/compat/array/difference.ts
+/**
+* Computes the difference between an array and multiple arrays.
+*
+* @template T
+* @param arr - The primary array from which to derive the difference. This is the main array
+* from which elements will be compared and filtered.
+* @param values - Multiple arrays containing elements to be excluded from the primary array.
+* These arrays will be flattened into a single array, and each element in this array will be checked against the primary array.
+* If a match is found, that element will be excluded from the result.
+* @returns A new array containing the elements that are present in the primary array but not
+* in the flattened array.
+*
+* @example
+* const array1 = [1, 2, 3, 4, 5];
+* const array2 = [2, 4];
+* const array3 = [5, 6];
+* const result = difference(array1, array2, array3);
+* // result will be [1, 3] since 2, 4, and 5 are in the other arrays and are excluded from the result.
+*
+* @example
+* const arrayLike1 = { 0: 1, 1: 2, 2: 3, length: 3 };
+* const arrayLike2 = { 0: 2, 1: 4, length: 2 };
+* const result = difference(arrayLike1, arrayLike2);
+* // result will be [1, 3] since 2 is in both array-like objects and is excluded from the result.
+*/
+function difference(arr, ...values) {
+	if (!isArrayLikeObject(arr)) return [];
+	const arr1 = Array.from(arr);
+	const arr2 = [];
+	for (let i = 0; i < values.length; i++) {
+		const value = values[i];
+		if (isArrayLikeObject(value)) arr2.push(...Array.from(value));
+	}
+	return difference$1(arr1, arr2);
+}
+//#endregion
+export { difference };