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-abstract/2022/ToPropertyKey.js

@@ -0,0 +1,15 @@
+'use strict';
+
+var GetIntrinsic = require('get-intrinsic');
+
+var $String = GetIntrinsic('%String%');
+
+var ToPrimitive = require('./ToPrimitive');
+var ToString = require('./ToString');
+
+// https://262.ecma-international.org/6.0/#sec-topropertykey
+
+module.exports = function ToPropertyKey(argument) {
+	var key = ToPrimitive(argument, $String);
+	return typeof key === 'symbol' ? key : ToString(key);
+};