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/util/toNumber.js

@@ -0,0 +1,24 @@
+const require_isSymbol = require("../predicate/isSymbol.js");
+//#region src/compat/util/toNumber.ts
+/**
+* Converts `value` to a number.
+*
+* Unlike `Number()`, this function returns `NaN` for symbols.
+*
+* @param value - The value to convert.
+* @returns Returns the number.
+*
+* @example
+* toNumber(3.2); // => 3.2
+* toNumber(Number.MIN_VALUE); // => 5e-324
+* toNumber(Infinity); // => Infinity
+* toNumber('3.2'); // => 3.2
+* toNumber(Symbol.iterator); // => NaN
+* toNumber(NaN); // => NaN
+*/
+function toNumber(value) {
+	if (require_isSymbol.isSymbol(value)) return NaN;
+	return Number(value);
+}
+//#endregion
+exports.toNumber = toNumber;