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/isBlob.mjs

@@ -0,0 +1,23 @@
+//#region src/predicate/isBlob.ts
+/**
+* Checks if the given value is a Blob.
+*
+* This function tests whether the provided value is an instance of `Blob`.
+* It returns `true` if the value is an instance of `Blob`, and `false` otherwise.
+*
+* @param x - The value to test if it is a Blob.
+* @returns True if the value is a Blob, false otherwise.
+*
+* @example
+* const value1 = new Blob();
+* const value2 = {};
+*
+* console.log(isBlob(value1)); // true
+* console.log(isBlob(value2)); // false
+*/
+function isBlob(x) {
+	if (typeof Blob === "undefined") return false;
+	return x instanceof Blob;
+}
+//#endregion
+export { isBlob };