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/math/round.js

@@ -0,0 +1,25 @@
+//#region src/math/round.ts
+/**
+* Rounds a number to a specified precision.
+*
+* This function takes a number and an optional precision value, and returns the number rounded
+* to the specified number of decimal places.
+*
+* @param value - The number to round.
+* @param [precision=0] - The number of decimal places to round to. Defaults to 0.
+* @returns The rounded number.
+* @throws {Error} Throws an error if `Precision` is not integer.
+*
+* @example
+* const result1 = round(1.2345); // result1 will be 1
+* const result2 = round(1.2345, 2); // result2 will be 1.23
+* const result3 = round(1.2345, 3); // result3 will be 1.235
+* const result4 = round(1.2345, 3.1); // This will throw an error
+*/
+function round(value, precision = 0) {
+	if (!Number.isInteger(precision)) throw new Error("Precision must be an integer.");
+	const multiplier = Math.pow(10, precision);
+	return Math.round(value * multiplier) / multiplier;
+}
+//#endregion
+exports.round = round;