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/unzip.mjs

@@ -0,0 +1,26 @@
+//#region src/array/unzip.ts
+/**
+* Gathers elements in the same position in an internal array
+* from a grouped array of elements and returns them as a new array.
+*
+* @template T - The type of elements in the nested array.
+* @param zipped - The nested array to unzip.
+* @returns A new array of unzipped elements.
+*
+* @example
+* const zipped = [['a', true, 1],['b', false, 2]];
+* const result = unzip(zipped);
+* // result will be [['a', 'b'], [true, false], [1, 2]]
+*/
+function unzip(zipped) {
+	let maxLen = 0;
+	for (let i = 0; i < zipped.length; i++) if (zipped[i].length > maxLen) maxLen = zipped[i].length;
+	const result = new Array(maxLen);
+	for (let i = 0; i < maxLen; i++) {
+		result[i] = new Array(zipped.length);
+		for (let j = 0; j < zipped.length; j++) result[i][j] = zipped[j][i];
+	}
+	return result;
+}
+//#endregion
+export { unzip };