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/flatMap.mjs

@@ -0,0 +1,22 @@
+import { isNil } from "../../predicate/isNil.mjs";
+import { flattenDepth } from "./flattenDepth.mjs";
+import { map } from "./map.mjs";
+//#region src/compat/array/flatMap.ts
+/**
+* Creates a flattened array of values by running each element in collection through iteratee and flattening the mapped results.
+*
+* @template R
+* @param collection - The collection to iterate over.
+* @param [iteratee] - The function invoked per iteration.
+* @returns Returns the new flattened array.
+*
+* @example
+* flatMap([1, 2], n => [n, n * 2]);
+* // => [1, 2, 2, 4]
+*/
+function flatMap(collection, iteratee) {
+	if (isNil(collection)) return [];
+	return flattenDepth(isNil(iteratee) ? map(collection) : map(collection, iteratee), 1);
+}
+//#endregion
+export { flatMap };