chore: movs display name helper to won helper module

lib/mv_web/live/member_live/index.ex

@@ -1165,61 +1165,6 @@ defmodule MvWeb.MemberLive.Index do
     end
   end
 
-  @doc """
-  Returns a display name for a member.
-
-  Combines first_name and last_name if available, otherwise falls back to email.
-  This ensures that members without names still have a meaningful display name.
-
-  ## Examples
-
-      iex> member = %Member{first_name: "John", last_name: "Doe", email: "john@example.com"}
-      iex> display_name(member)
-      "John Doe"
-
-      iex> member = %Member{first_name: nil, last_name: nil, email: "john@example.com"}
-      iex> display_name(member)
-      "john@example.com"
-
-      iex> member = %Member{first_name: "John", last_name: nil, email: "john@example.com"}
-      iex> display_name(member)
-      "John"
-  """
-  def display_name(member) do
-    name_parts =
-      [member.first_name, member.last_name]
-      |> Enum.reject(&blank?/1)
-      |> Enum.map_join(" ", &String.trim/1)
-
-    if name_parts == "" do
-      member.email
-    else
-      name_parts
-    end
-  end
-
-  @doc """
-  Checks if a value is blank (nil, empty string, or only whitespace).
-
-  ## Examples
-
-      iex> blank?(nil)
-      true
-
-      iex> blank?("")
-      true
-
-      iex> blank?("   ")
-      true
-
-      iex> blank?("John")
-      false
-  """
-  def blank?(nil), do: true
-  def blank?(""), do: true
-  def blank?(value) when is_binary(value), do: String.trim(value) == ""
-  def blank?(_), do: false
-
   # Public helper function to format dates for use in templates
   def format_date(date), do: DateFormatter.format_date(date)