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/xor.js

@@ -0,0 +1,26 @@
+const require_difference = require("./difference.js");
+const require_intersection = require("./intersection.js");
+const require_union = require("./union.js");
+//#region src/array/xor.ts
+/**
+* Computes the symmetric difference between two arrays. The symmetric difference is the set of elements
+* which are in either of the arrays, but not in their intersection.
+*
+* @template T - The type of elements in the array.
+* @param arr1 - The first array.
+* @param arr2 - The second array.
+* @returns An array containing the elements that are present in either `arr1` or `arr2` but not in both.
+*
+* @example
+* // Returns [1, 2, 5, 6]
+* xor([1, 2, 3, 4], [3, 4, 5, 6]);
+*
+* @example
+* // Returns ['a', 'c']
+* xor(['a', 'b'], ['b', 'c']);
+*/
+function xor(arr1, arr2) {
+	return require_difference.difference(require_union.union(arr1, arr2), require_intersection.intersection(arr1, arr2));
+}
+//#endregion
+exports.xor = xor;