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/predicate/isIterable.js

@@ -0,0 +1,28 @@
+//#region src/predicate/isIterable.ts
+/**
+* Checks if a value is iterable, i.e. it implements the iterable protocol by
+* providing a `Symbol.iterator` method.
+*
+* Arrays, strings, `Set`, `Map`, typed arrays, and generators are iterable;
+* plain objects, `null`, and `undefined` are not.
+*
+* This function can be used as a TypeScript type predicate to narrow the type of
+* `value` to `Iterable<unknown>`.
+*
+* @param value - The value to check.
+* @returns `true` if `value` is iterable, `false` otherwise.
+*
+* @example
+* isIterable([1, 2, 3]); // true
+* isIterable('abc'); // true
+* isIterable(new Set([1, 2, 3])); // true
+* isIterable(new Map()); // true
+* isIterable({ a: 1 }); // false
+* isIterable(123); // false
+* isIterable(null); // false
+*/
+function isIterable(value) {
+	return value != null && typeof value[Symbol.iterator] === "function";
+}
+//#endregion
+exports.isIterable = isIterable;