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/compat/predicate/isSafeInteger.mjs

@@ -0,0 +1,24 @@
+//#region src/compat/predicate/isSafeInteger.ts
+/**
+* Checks if `value` is a safe integer (between -(2^53 – 1) and (2^53 – 1), inclusive).
+*
+* A safe integer is an integer that can be precisely represented as a `number` in JavaScript,
+* without any other integer being rounded to it.
+*
+* This function also serves as a type predicate in TypeScript,
+* narrowing the type of the argument to `number`.
+*
+* @param value - The value to check
+* @returns `true` if `value` is an integer and between the safe values, otherwise `false`
+*
+* @example
+* isSafeInteger(3); // Returns: true
+* isSafeInteger(Number.MIN_SAFE_INTEGER - 1); // Returns: false
+* isSafeInteger(1n); // Returns: false
+* isSafeInteger('1'); // Returns: false
+*/
+function isSafeInteger(value) {
+	return Number.isSafeInteger(value);
+}
+//#endregion
+export { isSafeInteger };