fix(KB-241): use form values for ntfy test notifications

- Update frontend API client to accept config parameter for testNtfyNotification
- Modify SettingsModal to pass current form values when testing notifications
- Update SettingsModal test to expect config object in API call
- Add changeset documenting the test notification fix

packages/dashboard/app/components/__tests__/SettingsModal.test.tsx

@@ -1208,6 +1208,7 @@ describe("SettingsModal", () => {
     fireEvent.click(testButton);
 
     await waitFor(() => expect(testNtfyNotification).toHaveBeenCalledTimes(1));
+    expect(testNtfyNotification).toHaveBeenCalledWith({ ntfyEnabled: true, ntfyTopic: "my-valid-topic" });
   });
 
   it("Success toast is shown when test notification succeeds", async () => {