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/isSubset.js

@@ -0,0 +1,30 @@
+const require_difference = require("./difference.js");
+//#region src/array/isSubset.ts
+/**
+* Checks if the `subset` array is entirely contained within the `superset` array.
+*
+*
+* @template T - The type of elements contained in the arrays.
+* @param superset - The array that may contain all elements of the subset.
+* @param subset - The array to check against the superset.
+* @returns Returns `true` if all elements of the `subset` are present in the `superset`, otherwise returns `false`.
+*
+* @example
+* ```typescript
+* const superset = [1, 2, 3, 4, 5];
+* const subset = [2, 3, 4];
+* isSubset(superset, subset); // true
+* ```
+*
+* @example
+* ```typescript
+* const superset = ['a', 'b', 'c'];
+* const subset = ['a', 'd'];
+* isSubset(superset, subset); // false
+* ```
+*/
+function isSubset(superset, subset) {
+	return require_difference.difference(subset, superset).length === 0;
+}
+//#endregion
+exports.isSubset = isSubset;