Update and move turbo_stream actions to separate file

Use CSS `visibility` instead of `display` for #show/#hide.
Access data attributes through `dataset` property.

app/views/application/errors.turbo_stream.erb

@@ -1,4 +1,4 @@
-<%= turbo_stream.validate dom_target(*@target, :form) do %>
+<%= turbo_stream.validate_form dom_target(*@target, :form) do %>
   <% @record.errors.attribute_names.map do |attr| %>
     <%= tag.span data: {name: field_name(dom_class(@record), attr)} do %>
       <%- @record.errors.full_messages_for(attr).map { |m| m + '.' }.join(' ') %>