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/string/toLower.mjs

@@ -0,0 +1,24 @@
+import { toString } from "../util/toString.mjs";
+//#region src/compat/string/toLower.ts
+/**
+* Converts the given value to a string and transforms it to lower case.
+* The function can handle various input types by first converting them to strings.
+*
+* @param [value=''] The value to convert.
+* @returns Returns the lower cased string.
+* @example
+*
+* toLower('--FOO-BAR--');
+* // => '--foo-bar--'
+*
+* toLower(null);
+* // => ''
+*
+* toLower([1, 2, 3]);
+* // => '1,2,3'
+*/
+function toLower(value) {
+	return toString(value).toLowerCase();
+}
+//#endregion
+export { toLower };