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/concat.d.mts

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+//#region src/compat/array/concat.d.ts
+/**
+ * Concatenates multiple arrays and values into a single array.
+ *
+ * @template T The type of elements in the array.
+ * @param values - The values and/or arrays to concatenate.
+ * @returns A new array containing all the input values.
+ *
+ * @example
+ * // Concatenate individual values
+ * concat(1, 2, 3);
+ * // returns [1, 2, 3]
+ *
+ * @example
+ * // Concatenate arrays of values
+ * concat([1, 2], [3, 4]);
+ * // returns [1, 2, 3, 4]
+ *
+ * @example
+ * // Concatenate a mix of individual values and arrays
+ * concat(1, [2, 3], 4);
+ * // returns [1, 2, 3, 4]
+ *
+ * @example
+ * // Concatenate nested arrays
+ * concat([1, [2, 3]], 4);
+ * // returns [1, [2, 3], 4]
+ */
+declare function concat<T>(...values: Array<T | readonly T[]>): T[];
+//#endregion
+export { concat };