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/string/escape.mjs

@@ -0,0 +1,26 @@
+//#region src/string/escape.ts
+const htmlEscapes = {
+	"&": "&",
+	"<": "&lt;",
+	">": "&gt;",
+	"\"": "&quot;",
+	"'": "&#39;"
+};
+/**
+* Converts the characters "&", "<", ">", '"', and "'" in `str` to their corresponding HTML entities.
+* For example, "<" becomes "&lt;".
+*
+* @param str  The string to escape.
+* @returns Returns the escaped string.
+*
+* @example
+* escape('This is a <div> element.'); // returns 'This is a &lt;div&gt; element.'
+* escape('This is a "quote"'); // returns 'This is a &quot;quote&quot;'
+* escape("This is a 'quote'"); // returns 'This is a &#39;quote&#39;'
+* escape('This is a & symbol'); // returns 'This is a &amp; symbol'
+*/
+function escape(str) {
+	return str.replace(/[&<>"']/g, (match) => htmlEscapes[match]);
+}
+//#endregion
+export { escape };