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/array/initial.mjs

@@ -0,0 +1,19 @@
+//#region src/array/initial.ts
+/**
+* Returns a new array containing all elements except the last one from the input array.
+* If the input array is empty or has only one element, the function returns an empty array.
+*
+* @template T The type of elements in the array.
+* @param arr - The input array.
+* @returns A new array containing all but the last element of the input array.
+*
+* @example
+* const arr = [1, 2, 3, 4];
+* const result = initial(arr);
+* // result will be [1, 2, 3]
+*/
+function initial(arr) {
+	return arr.slice(0, -1);
+}
+//#endregion
+export { initial };