Allow disabling AI assistant (#146)

* Test disabling AI assistant

* Leave "Maybe" out of it

* It's "sure" now

test/system/settings/ai_prompts_test.rb

@@ -0,0 +1,19 @@
+require "application_system_test_case"
+
+class Settings::AiPromptsTest < ApplicationSystemTestCase
+  setup do
+    @user = users(:family_admin)
+    @user.update!(ai_enabled: true)
+    login_as @user
+  end
+
+  test "user can disable ai assistant" do
+    visit settings_ai_prompts_path
+
+    click_button "Disable AI Assistant"
+
+    assert_current_path settings_ai_prompts_path
+    @user.reload
+    assert_not @user.ai_enabled?
+  end
+end