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/string/trimEnd.d.ts

@@ -0,0 +1,31 @@
+//#region src/compat/string/trimEnd.d.ts
+/**
+ * Removes trailing whitespace or specified characters from a string.
+ *
+ * @param string - The string to trim.
+ * @param chars - The characters to trim from the end of the string.
+ * @returns Returns the trimmed string.
+ *
+ * @example
+ * trimEnd('  abc  ');
+ * // => '  abc'
+ *
+ * trimEnd('-_-abc-_-', '_-');
+ * // => '-_-abc'
+ */
+declare function trimEnd(string?: string, chars?: string): string;
+/**
+ * Removes trailing whitespace or specified characters from a string.
+ *
+ * @param string - The string to trim.
+ * @param index - The index parameter (used with guard).
+ * @param guard - Enables use as an iteratee for methods like `map`.
+ * @returns Returns the trimmed string.
+ *
+ * @example
+ * trimEnd('  abc  ', 0, {});
+ * // => '  abc'
+ */
+declare function trimEnd(string: string, index: string | number, guard: object): string;
+//#endregion
+export { trimEnd };