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/map/mapValues.mjs

@@ -0,0 +1,38 @@
+//#region src/map/mapValues.ts
+/**
+* Creates a new Map with the same keys but with values transformed by the provided function.
+*
+* This function takes a Map and a function that generates a new value from each value-key pair.
+* It returns a new Map where the values are the result of applying the function to each entry,
+* while the keys remain the same.
+*
+* @template K - The type of keys in the Map.
+* @template V - The type of values in the Map.
+* @param map - The Map to transform.
+* @param getNewValue - A function that generates a new value from a value-key pair.
+* @returns A new Map with the same keys and transformed values.
+*
+* @example
+* const map = new Map([
+*   ['a', 1],
+*   ['b', 2],
+*   ['c', 3]
+* ]);
+* const result = mapValues(map, (value) => value * 2);
+* // result will be:
+* // Map(3) {
+* //   'a' => 2,
+* //   'b' => 4,
+* //   'c' => 6
+* // }
+*/
+function mapValues(map, getNewValue) {
+	const result = /* @__PURE__ */ new Map();
+	for (const [key, value] of map) {
+		const newValue = getNewValue(value, key, map);
+		result.set(key, newValue);
+	}
+	return result;
+}
+//#endregion
+export { mapValues };