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/mapKeys.mjs

@@ -0,0 +1,38 @@
+//#region src/map/mapKeys.ts
+/**
+* Creates a new Map with the same values but with keys transformed by the provided function.
+*
+* This function takes a Map and a function that generates a new key from each value-key pair.
+* It returns a new Map where the keys are the result of applying the function to each entry,
+* while the values 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 getNewKey - A function that generates a new key from a value-key pair.
+* @returns A new Map with transformed keys and the same values.
+*
+* @example
+* const map = new Map([
+*   ['a', 1],
+*   ['b', 2],
+*   ['c', 3]
+* ]);
+* const result = mapKeys(map, (value, key) => key.toUpperCase());
+* // result will be:
+* // Map(3) {
+* //   'A' => 1,
+* //   'B' => 2,
+* //   'C' => 3
+* // }
+*/
+function mapKeys(map, getNewKey) {
+	const result = /* @__PURE__ */ new Map();
+	for (const [key, value] of map) {
+		const newKey = getNewKey(value, key, map);
+		result.set(newKey, value);
+	}
+	return result;
+}
+//#endregion
+export { mapKeys };