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/set/map.mjs

@@ -0,0 +1,29 @@
+//#region src/set/map.ts
+/**
+* Creates a new Set with elements transformed by the provided function.
+*
+* This function takes a Set and a function that generates a new value from each element.
+* It returns a new Set where the elements are the result of applying the function to each element.
+*
+* @template T - The type of elements in the input Set.
+* @template U - The type of elements in the output Set.
+* @param set - The Set to transform.
+* @param getNewValue - A function that generates a new value from an element.
+* @returns A new Set with transformed elements.
+*
+* @example
+* const set = new Set([1, 2, 3]);
+* const result = map(set, (value) => value * 2);
+* // result will be:
+* // Set(3) { 2, 4, 6 }
+*/
+function map(set, getNewValue) {
+	const result = /* @__PURE__ */ new Set();
+	for (const value of set) {
+		const newValue = getNewValue(value, value, set);
+		result.add(newValue);
+	}
+	return result;
+}
+//#endregion
+export { map };