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.d.ts

@@ -0,0 +1,20 @@
+//#region src/predicate/isBlob.d.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
+ */
+declare function isBlob(x: unknown): x is Blob;
+//#endregion
+export { isBlob };