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/nth.mjs

@@ -0,0 +1,22 @@
+import { isArrayLikeObject } from "../predicate/isArrayLikeObject.mjs";
+import { toInteger } from "../util/toInteger.mjs";
+//#region src/compat/array/nth.ts
+/**
+* Gets the element at index `n` of `array`. If `n` is negative, the nth element from the end is returned.
+*
+* @param array - The array to query.
+* @param [n=0] - The index of the element to return.
+* @return {T | undefined} Returns the nth element of `array`.
+*
+* @example
+* nth([1, 2, 3], 1); // => 2
+* nth([1, 2, 3], -1); // => 3
+*/
+function nth(array, n = 0) {
+	if (!isArrayLikeObject(array) || array.length === 0) return;
+	n = toInteger(n);
+	if (n < 0) n += array.length;
+	return array[n];
+}
+//#endregion
+export { nth };