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/toFinite.d.ts

@@ -0,0 +1,18 @@
+//#region src/compat/util/toFinite.d.ts
+/**
+ * Converts `value` to a finite number.
+ *
+ * @param value - The value to convert.
+ * @returns Returns the number.
+ *
+ * @example
+ * toFinite(3.2); // => 3.2
+ * toFinite(Number.MIN_VALUE); // => 5e-324
+ * toFinite(Infinity); // => 1.7976931348623157e+308
+ * toFinite('3.2'); // => 3.2
+ * toFinite(Symbol.iterator); // => 0
+ * toFinite(NaN); // => 0
+ */
+declare function toFinite(value: any): number;
+//#endregion
+export { toFinite };