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/reduce.js

@@ -0,0 +1,35 @@
+//#region src/set/reduce.ts
+/**
+* Reduces a Set to a single value by iterating through its elements and applying a callback function.
+*
+* This function iterates through all elements of the Set and applies the callback function to each element,
+* accumulating the result. If an initial value is provided, it is used as the starting accumulator value.
+* If no initial value is provided and the Set is empty, a TypeError is thrown.
+*
+* @template T - The type of elements in the Set.
+* @template A - The type of the accumulator.
+* @param set - The Set to reduce.
+* @param callback - A function that processes each element and updates the accumulator.
+* @param [initialValue] - The initial value for the accumulator. If not provided, the first element in the Set is used.
+* @returns The final accumulated value.
+* @throws {TypeError} If the Set is empty and no initial value is provided.
+*
+* @example
+* const set = new Set([1, 2, 3]);
+* const result = reduce(set, (acc, value) => acc + value, 0);
+* // result will be: 6
+*
+* @example
+* const set = new Set([10, 20]);
+* const result = reduce(set, (acc, value) => acc + value);
+* // result will be: 30 (starts with first value 10)
+*/
+function reduce(set, callback, initialValue) {
+	if (initialValue == null && set.size === 0) throw new TypeError("Reduce of empty set with no initial value");
+	let accumulator = initialValue;
+	for (const value of set) if (accumulator == null) accumulator = value;
+	else accumulator = callback(accumulator, value, value, set);
+	return accumulator;
+}
+//#endregion
+exports.reduce = reduce;