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/array/windowed.d.ts

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+//#region src/array/windowed.d.ts
+/**
+ * Options for the windowed function.
+ *
+ * @interface WindowedOptions
+ * @property {boolean} [partialWindows=false] - Whether to include partial windows at the end of the array.
+ */
+interface WindowedOptions {
+  /**
+   * Whether to include partial windows at the end of the array.
+   *
+   * By default, `windowed` only includes full windows in the result,
+   * ignoring any leftover elements that can't form a full window.
+   *
+   * If `partialWindows` is true, the function will also include these smaller, partial windows at the end of the result.
+   */
+  partialWindows?: boolean;
+}
+/**
+ * Creates an array of sub-arrays (windows) from the input array, each of the specified size.
+ * The windows can overlap depending on the step size provided.
+ *
+ * By default, only full windows are included in the result, and any leftover elements that can't form a full window are ignored.
+ *
+ * If the `partialWindows` option is set to true in the options object, the function will also include partial windows at the end of the result.
+ * Partial windows are smaller sub-arrays created when there aren't enough elements left in the input array to form a full window.
+ *
+ * @template T
+ * @param arr - The input array to create windows from.
+ * @param size - The size of each window. Must be a positive integer.
+ * @param [step=1] - The step size between the start of each window. Must be a positive integer.
+ * @param [options={}] - Options object to configure the behavior of the function.
+ * @param [options.partialWindows=false] - Whether to include partial windows at the end of the array.
+ * @returns An array of windows (sub-arrays) created from the input array.
+ * @throws {Error} If the size or step is not a positive integer.
+ *
+ * @example
+ * windowed([1, 2, 3, 4], 2);
+ * // => [[1, 2], [2, 3], [3, 4]]
+ *
+ * @example
+ * windowed([1, 2, 3, 4, 5, 6], 3, 2);
+ * // => [[1, 2, 3], [3, 4, 5]]
+ *
+ * @example
+ * windowed([1, 2, 3, 4, 5, 6], 3, 2, { partialWindows: true });
+ * // => [[1, 2, 3], [3, 4, 5], [5, 6]]
+ */
+declare function windowed<T>(arr: readonly T[], size: number, step?: number, {
+  partialWindows
+}?: WindowedOptions): T[][];
+//#endregion
+export { WindowedOptions, windowed };