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/array/findIndex.d.ts

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+import { ListIterateeCustom } from "../_internal/ListIterateeCustom.js";
+
+//#region src/compat/array/findIndex.d.ts
+/**
+ * Finds the index of the first item in an array that has a specific property, where the property name is provided as a PropertyKey.
+ *
+ * @template T
+ * @param arr - The array to search through.
+ * @param doesMatch - The criteria to match against the items in the array. This can be a function, a partial object, a key-value pair, or a property name.
+ * @param propertyToCheck - The property name to check for in the items of the array.
+ * @param [fromIndex=0] - The index to start the search from, defaults to 0.
+ * @returns The index of the first item that has the specified property, or `-1` if no match is found.
+ *
+ * @example
+ * // Using a property name
+ * const items = [{ id: 1, name: 'Alice' }, { id: 2, name: 'Bob' }];
+ * const result = findIndex(items, 'name');
+ * console.log(result); // 0
+ */
+declare function findIndex<T>(arr: ArrayLike<T> | null | undefined, doesMatch?: ListIterateeCustom<T, boolean>, fromIndex?: number): number;
+//#endregion
+export { findIndex };