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/compat/predicate/isArrayLike.mjs

@@ -0,0 +1,21 @@
+import { isLength } from "../../predicate/isLength.mjs";
+//#region src/compat/predicate/isArrayLike.ts
+/**
+* Checks if `value` is array-like.
+*
+* @param value The value to check.
+* @returns Returns `true` if `value` is array-like, else `false`.
+*
+* @example
+* isArrayLike([1, 2, 3]); // true
+* isArrayLike('abc'); // true
+* isArrayLike({ 0: 'a', length: 1 }); // true
+* isArrayLike({}); // false
+* isArrayLike(null); // false
+* isArrayLike(undefined); // false
+*/
+function isArrayLike(value) {
+	return value != null && typeof value !== "function" && isLength(value.length);
+}
+//#endregion
+export { isArrayLike };