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/trim.d.ts

@@ -0,0 +1,16 @@
+//#region src/string/trim.d.ts
+/**
+ * Removes leading and trailing whitespace or specified characters from a string.
+ *
+ * @param str - The string from which characters will be trimmed.
+ * @param chars - The character(s) to remove from the string. Can be a single character or an array of characters.
+ * @returns The resulting string after the specified characters have been removed.
+ *
+ * @example
+ * trim("  hello  "); // "hello"
+ * trim("--hello--", "-"); // "hello"
+ * trim("##hello##", ["#", "o"]); // "hell"
+ */
+declare function trim(str: string, chars?: string | string[]): string;
+//#endregion
+export { trim };