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/fp/array/windowed.d.ts

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+import { WindowedOptions } from "../../array/windowed.js";
+
+//#region src/fp/array/windowed.d.ts
+/**
+ * Creates a function that returns sliding windows from an array.
+ *
+ * By default only full windows are returned. Pass partialWindows: true to include shorter
+ * trailing windows. The full-window form is lazy-capable inside {@link pipe}.
+ *
+ * @template T - The type of elements in the array.
+ * @param size - The size of each window. Must be a positive integer.
+ * @param step - The step between window starts. Defaults to 1.
+ * @param options - Window options.
+ * @returns A function that maps a readonly array to sliding windows.
+ * @throws {Error} When size or step is not a positive integer.
+ *
+ * @example
+ * import { pipe, windowed } from 'es-toolkit/fp';
+ *
+ * pipe([1, 2, 3, 4], windowed(2));
+ * // => [[1, 2], [2, 3], [3, 4]]
+ */
+declare function windowed<T>(size: number, step?: number, options?: WindowedOptions): (array: readonly T[]) => T[][];
+//#endregion
+export { windowed };