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/function/throttle.mjs

@@ -0,0 +1,54 @@
+import { debounce } from "./debounce.mjs";
+//#region src/function/throttle.ts
+/**
+* Creates a throttled function that only invokes the provided function at most once
+* per every `throttleMs` milliseconds. Subsequent calls to the throttled function
+* within the wait time will not trigger the execution of the original function.
+*
+* @template F - The type of function.
+* @param func - The function to throttle.
+* @param throttleMs - The number of milliseconds to throttle executions to.
+* @returns A new throttled function that accepts the same parameters as the original function.
+*
+* @example
+* const throttledFunction = throttle(() => {
+*   console.log('Function executed');
+* }, 1000);
+*
+* // Will log 'Function executed' immediately
+* throttledFunction();
+*
+* // Will not log anything as it is within the throttle time
+* throttledFunction();
+*
+* // After 1 second
+* setTimeout(() => {
+*   throttledFunction(); // Will log 'Function executed'
+* }, 1000);
+*/
+function throttle(func, throttleMs, { signal, edges = ["leading", "trailing"] } = {}) {
+	let pendingAt = null;
+	const debounced = debounce(function(...args) {
+		pendingAt = Date.now();
+		func.apply(this, args);
+	}, throttleMs, {
+		signal,
+		edges
+	});
+	const throttled = function(...args) {
+		if (pendingAt == null) pendingAt = Date.now();
+		if (Date.now() - pendingAt >= throttleMs) {
+			pendingAt = Date.now();
+			func.apply(this, args);
+			debounced.cancel();
+			debounced.schedule();
+			return;
+		}
+		debounced.apply(this, args);
+	};
+	throttled.cancel = debounced.cancel;
+	throttled.flush = debounced.flush;
+	return throttled;
+}
+//#endregion
+export { throttle };