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/function/negate.d.ts

@@ -0,0 +1,17 @@
+//#region src/function/negate.d.ts
+/**
+ * Creates a function that negates the result of the predicate function.
+ *
+ * @template F - The type of the function to negate.
+ * @param func - The function to negate.
+ * @returns The new negated function, which negates the boolean result of `func`.
+ *
+ * @example
+ * const array = [1, 2, 3, 4, 5, 6];
+ * const isEven = (n: number) => n % 2 === 0;
+ * const result = array.filter(negate(isEven));
+ * // result will be [1, 3, 5]
+ */
+declare function negate<F extends (...args: any[]) => boolean>(func: F): F;
+//#endregion
+export { negate };