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/predicate/isSymbol.js

@@ -0,0 +1,29 @@
+//#region src/predicate/isSymbol.ts
+/**
+* Check whether a value is a symbol.
+*
+* This function can also serve as a type predicate in TypeScript, narrowing the type of the argument to `symbol`.
+*
+* @param value The value to check.
+* @returns Returns `true` if `value` is a symbol, else `false`.
+*
+* @example
+* import { isSymbol } from 'es-toolkit/predicate';
+*
+* isSymbol(Symbol('a')); // true
+* isSymbol(Symbol.for('a')); // true
+* isSymbol(Symbol.iterator); // true
+*
+* isSymbol(null); // false
+* isSymbol(undefined); // false
+* isSymbol('123'); // false
+* isSymbol(false); // false
+* isSymbol(123n); // false
+* isSymbol({}); // false
+* isSymbol([1, 2, 3]); // false
+*/
+function isSymbol(value) {
+	return typeof value === "symbol";
+}
+//#endregion
+exports.isSymbol = isSymbol;