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/flatMap.mjs

@@ -0,0 +1,38 @@
+import { flatMap as flatMap$1 } from "../../array/flatMap.mjs";
+import { combineEagerAndLazyFunctions, createLazyFunction } from "../_internal/lazy.mjs";
+//#region src/fp/array/flatMap.ts
+/**
+* Creates a function that maps every element to an array with `callback` and
+* concatenates the results, equivalent to `Array.prototype.flatMap`. Use it
+* with {@link pipe}.
+*
+* The returned function is **lazy-capable**: inside a {@link pipe} it is fused
+* with adjacent lazy functions and runs element-by-element, so a trailing
+* `take` can terminate the walk early without expanding the rest of the input.
+*
+* @template T - The type of elements in the input array.
+* @template U - The type of elements in the output array.
+* @param callback - Called with `(value, index)` for each element; returns an
+*   array whose elements are flattened into the output.
+* @returns A function that maps a `readonly T[]` to a new `U[]`.
+*
+* @example
+* import { pipe, flatMap } from 'es-toolkit/fp';
+*
+* pipe([1, 2, 3], flatMap(x => [x, x * 10])); // => [1, 10, 2, 20, 3, 30]
+*
+* @example
+* // Returning an empty array drops the element.
+* pipe([1, 2, 3, 4], flatMap(x => (x % 2 === 0 ? [x] : []))); // => [2, 4]
+*/
+function flatMap(callback) {
+	function flatMapEager(array) {
+		return flatMap$1(array, callback);
+	}
+	return combineEagerAndLazyFunctions(flatMapEager, createLazyFunction((value, index, emit) => {
+		const items = callback(value, index);
+		for (let i = 0; i < items.length; i++) emit(items[i]);
+	}));
+}
+//#endregion
+export { flatMap };