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/function/negate.d.ts

@@ -0,0 +1,19 @@
+//#region src/compat/function/negate.d.ts
+/**
+ * Creates a function that negates the result of the predicate function.
+ *
+ * @template T - The type of the arguments array.
+ * @param predicate - The predicate to negate.
+ * @returns The new negated function.
+ *
+ * @example
+ * function isEven(n) {
+ *   return n % 2 == 0;
+ * }
+ *
+ * filter([1, 2, 3, 4, 5, 6], negate(isEven));
+ * // => [1, 3, 5]
+ */
+declare function negate<T extends any[]>(predicate: (...args: T) => boolean): (...args: T) => boolean;
+//#endregion
+export { negate };