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/object/findKey.d.ts

@@ -0,0 +1,22 @@
+//#region src/object/findKey.d.ts
+/**
+ * Finds the key of the first element in the object that satisfies the provided testing function.
+ *
+ * @param obj - The object to search.
+ * @param predicate - The function to execute on each value in the object. It takes three arguments:
+ *   - value: The current value being processed in the object.
+ *   - key: The key of the current value being processed in the object.
+ *   - obj: The object that findKey was called upon.
+ * @returns The key of the first element in the object that passes the test, or undefined if no element passes.
+ *
+ * @example
+ * const users = {
+ *   'barney':  { 'age': 36, 'active': true },
+ *   'fred':    { 'age': 40, 'active': false },
+ *   'pebbles': { 'age': 1,  'active': true }
+ * };
+ * findKey(users, function(o) { return o.age < 40; }); => 'barney'
+ */
+declare function findKey<T extends Record<any, any>>(obj: T, predicate: (value: T[keyof T], key: keyof T, obj: T) => boolean): keyof T | undefined;
+//#endregion
+export { findKey };