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/fp/array/length.js

@@ -0,0 +1,22 @@
+//#region src/fp/array/length.ts
+/**
+* Creates a function that returns the length of an array.
+*
+* Use it with {@link pipe} when a pipeline should end with the number of input values.
+*
+* @template T - The type of elements in the array.
+* @returns A function that maps a readonly array to its length.
+*
+* @example
+* import { length, pipe } from 'es-toolkit/fp';
+*
+* pipe(['a', 'b', 'c'], length());
+* // => 3
+*/
+function length() {
+	return function(array) {
+		return array.length;
+	};
+}
+//#endregion
+exports.length = length;