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/string/trimEnd.js

@@ -0,0 +1,31 @@
+//#region src/string/trimEnd.ts
+/**
+* Removes trailing whitespace or specified characters from a string.
+*
+* If `chars` is a string, it should be a single character. To trim a string with multiple characters,
+* provide an array instead.
+*
+* @param str - The string from which trailing characters will be trimmed.
+* @param chars - The character(s) to remove from the end of the string.
+* @returns The resulting string after the specified trailing character has been removed.
+*
+* @example
+* const trimmedStr1 = trimEnd('hello---', '-') // returns 'hello'
+* const trimmedStr2 = trimEnd('123000', '0') // returns '123'
+* const trimmedStr3 = trimEnd('abcabcabc', 'c') // returns 'abcabcab'
+* const trimmedStr4 = trimEnd('trimmedxxx', 'x') // returns 'trimmed'
+*/
+function trimEnd(str, chars) {
+	if (chars === void 0) return str.trimEnd();
+	let endIndex = str.length;
+	switch (typeof chars) {
+		case "string":
+			if (chars.length !== 1) throw new Error(`The 'chars' parameter should be a single character string.`);
+			while (endIndex > 0 && str[endIndex - 1] === chars) endIndex--;
+			break;
+		case "object": while (endIndex > 0 && chars.includes(str[endIndex - 1])) endIndex--;
+	}
+	return str.substring(0, endIndex);
+}
+//#endregion
+exports.trimEnd = trimEnd;