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/2019/IsSharedArrayBuffer.js

@@ -0,0 +1,16 @@
+'use strict';
+
+var $TypeError = require('es-errors/type');
+var isObject = require('es-object-atoms/isObject');
+
+var isSharedArrayBuffer = require('is-shared-array-buffer');
+
+// https://262.ecma-international.org/8.0/#sec-issharedarraybuffer
+
+module.exports = function IsSharedArrayBuffer(obj) {
+	if (!isObject(obj)) {
+		throw new $TypeError('Assertion failed: Type(O) is not Object');
+	}
+
+	return isSharedArrayBuffer(obj);
+};