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/set/reduce.d.mts

@@ -0,0 +1,29 @@
+//#region src/set/reduce.d.ts
+/**
+ * Reduces a Set to a single value by iterating through its elements and applying a callback function.
+ *
+ * This function iterates through all elements of the Set and applies the callback function to each element,
+ * accumulating the result. If an initial value is provided, it is used as the starting accumulator value.
+ * If no initial value is provided and the Set is empty, a TypeError is thrown.
+ *
+ * @template T - The type of elements in the Set.
+ * @template A - The type of the accumulator.
+ * @param set - The Set to reduce.
+ * @param callback - A function that processes each element and updates the accumulator.
+ * @param [initialValue] - The initial value for the accumulator. If not provided, the first element in the Set is used.
+ * @returns The final accumulated value.
+ * @throws {TypeError} If the Set is empty and no initial value is provided.
+ *
+ * @example
+ * const set = new Set([1, 2, 3]);
+ * const result = reduce(set, (acc, value) => acc + value, 0);
+ * // result will be: 6
+ *
+ * @example
+ * const set = new Set([10, 20]);
+ * const result = reduce(set, (acc, value) => acc + value);
+ * // result will be: 30 (starts with first value 10)
+ */
+declare function reduce<T, A = T>(set: Set<T>, callback: (accumulator: A, value: T, value2: T, set: Set<T>) => A, initialValue?: A): A;
+//#endregion
+export { reduce };