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/flatten.mjs

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+import { flatten as flatten$1 } from "../../array/flatten.mjs";
+import { combineEagerAndLazyFunctions, createLazyFunction } from "../_internal/lazy.mjs";
+//#region src/fp/array/flatten.ts
+/**
+* Creates a function that flattens an array up to the specified depth.
+*
+* The returned function is lazy-capable inside {@link pipe}. A trailing
+* short-circuiting operator can stop before later nested values are visited.
+*
+* @template T - The type of elements in the array.
+* @template D - The depth to which nested arrays should be flattened.
+* @param depth - The flattening depth. Defaults to 1.
+* @returns A function that maps the piped array to a flattened array.
+*
+* @example
+* import { flatten, pipe } from 'es-toolkit/fp';
+*
+* pipe([1, [2, [3]]], flatten(2));
+* // => [1, 2, 3]
+*/
+function flatten(depth = 1) {
+	const flooredDepth = Math.floor(depth);
+	function flattenEager(array) {
+		return flatten$1(array, depth);
+	}
+	return combineEagerAndLazyFunctions(flattenEager, createLazyFunction((value, _index, emit) => {
+		emitFlattened(value, 0, flooredDepth, emit);
+	}));
+}
+function emitFlattened(value, currentDepth, maxDepth, emit) {
+	if (Array.isArray(value) && currentDepth < maxDepth) {
+		for (let index = 0; index < value.length; index++) emitFlattened(value[index], currentDepth + 1, maxDepth, emit);
+		return;
+	}
+	emit(value);
+}
+//#endregion
+export { flatten };