Implement a setting to retrieve high res logos (#725)

* Implement a setting to retrieve high res logos

* Update _brand_fetch_settings.html.erb

* Add fallback for stock tickers also to use Brandfetch

* Update security.rb

* Update toggle logic for high-res logos setting

Signed-off-by: Juan José Mata <jjmata@jjmata.com>

* Update security.rb

* Update security.rb

---------

Signed-off-by: Juan José Mata <jjmata@jjmata.com>
Co-authored-by: Juan José Mata <jjmata@jjmata.com>

test/models/family/auto_merchant_detector_test.rb

@@ -9,6 +9,7 @@ class Family::AutoMerchantDetectorTest < ActiveSupport::TestCase
     @llm_provider = mock
     Provider::Registry.stubs(:get_provider).with(:openai).returns(@llm_provider)
     Setting.stubs(:brand_fetch_client_id).returns("123")
+    Setting.stubs(:brand_fetch_logo_size).returns(40)
   end
 
   test "auto detects transaction merchants" do