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/workbox-navigation-preload/isSupported.js

@@ -0,0 +1,18 @@
+/*
+  Copyright 2018 Google LLC
+
+  Use of this source code is governed by an MIT-style
+  license that can be found in the LICENSE file or at
+  https://opensource.org/licenses/MIT.
+*/
+import './_version.js';
+/**
+ * @return {boolean} Whether or not the current browser supports enabling
+ * navigation preload.
+ *
+ * @memberof workbox-navigation-preload
+ */
+function isSupported() {
+    return Boolean(self.registration && self.registration.navigationPreload);
+}
+export { isSupported };