refactor: adds schemales changeset and validation constant

lib/mv/constants.ex

@@ -19,6 +19,8 @@ defmodule Mv.Constants do
 
   @custom_field_prefix "custom_field_"
 
+  @email_validator_checks [:html_input, :pow]
+
   def member_fields, do: @member_fields
 
   @doc """
@@ -30,4 +32,23 @@ defmodule Mv.Constants do
       "custom_field_"
   """
   def custom_field_prefix, do: @custom_field_prefix
+
+  @doc """
+  Returns the email validator checks used for EctoCommons.EmailValidator.
+
+  We use both `:html_input` and `:pow` checks:
+  - `:html_input` - Pragmatic validation matching browser `<input type="email">` behavior
+  - `:pow` - Stricter validation following email spec, supports internationalization (Unicode)
+
+  Using both ensures:
+  - Compatibility with common email providers (html_input)
+  - Compliance with email standards (pow)
+  - Support for international email addresses (pow)
+
+  ## Examples
+
+      iex> Mv.Constants.email_validator_checks()
+      [:html_input, :pow]
+  """
+  def email_validator_checks, do: @email_validator_checks
 end