feat(flash messages): add a helper method to keep link when sanitizing

app/helpers/sanitize_with_link_helper.rb

@@ -0,0 +1,6 @@
+module SanitizeWithLinkHelper
+  def sanitize_with_link(value)
+    tags = Rails.configuration.action_view.sanitized_allowed_tags + ['a']
+    sanitize(value, tags:)
+  end
+end

app/views/layouts/_flash_messages.html.haml

@@ -7,8 +7,8 @@
         - if value.class == Array
           .alert{ class: flash_class(key, sticky: sticky, fixed: fixed), role: flash_role(key) }
             - value.each do |message|
-              = sanitize(message)
+              = sanitize_with_link(message)
               %br
         - else
           .alert{ class: flash_class(key, sticky: sticky, fixed: fixed), role: flash_role(key) }
-            = sanitize(value)
+            = sanitize_with_link(value)