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/object/hasIn.d.ts

@@ -0,0 +1,44 @@
+import { PropertyPath } from "../_internal/PropertyPath.js";
+
+//#region src/compat/object/hasIn.d.ts
+/**
+ * Checks if a given path exists in an object, **including inherited properties**.
+ *
+ * You can provide the path as a single property key, an array of property keys,
+ * or a string representing a deep path.
+ *
+ * Unlike `has`, which only checks for own properties, `hasIn` also checks for properties
+ * in the prototype chain.
+ *
+ * If the path is an index and the object is an array or an arguments object, the function will verify
+ * if the index is valid and within the bounds of the array or arguments object, even if the array or
+ * arguments object is sparse (i.e., not all indexes are defined).
+ *
+ * @template T
+ * @param object - The object to query.
+ * @param path - The path to check. This can be a single property key,
+ *        an array of property keys, or a string representing a deep path.
+ * @returns Returns `true` if the path exists (own or inherited), `false` otherwise.
+ *
+ * @example
+ *
+ * const obj = { a: { b: { c: 3 } } };
+ *
+ * hasIn(obj, 'a'); // true
+ * hasIn(obj, ['a', 'b']); // true
+ * hasIn(obj, ['a', 'b', 'c']); // true
+ * hasIn(obj, 'a.b.c'); // true
+ * hasIn(obj, 'a.b.d'); // false
+ * hasIn(obj, ['a', 'b', 'c', 'd']); // false
+ *
+ * // Example with inherited properties:
+ * function Rectangle() {}
+ * Rectangle.prototype.area = function() {};
+ *
+ * const rect = new Rectangle();
+ * hasIn(rect, 'area'); // true
+ * has(rect, 'area'); // false - has only checks own properties
+ */
+declare function hasIn<T>(object: T, path: PropertyPath): boolean;
+//#endregion
+export { hasIn };