test: Add role tag support to ConnCase and fix test issues

- Add role tag support (@tag role: :admin/:member/:unauthenticated) to ConnCase
- Fix Keyword.get -> Map.get for tags Map
- Remove duplicate test file index_display_name_test.exs
- Fix CustomField creation in tests (remove slug, use :string instead of :text)
- Fix CustomFieldValue value format to use _union_type/_union_value

test/support/conn_case.ex

@@ -154,11 +154,36 @@ defmodule MvWeb.ConnCase do
     # to share the test's database connection in async tests
     conn = Plug.Conn.put_private(conn, :ecto_sandbox, pid)
 
-    # Create admin user with role for all tests (unless test overrides with its own user)
-    # This ensures all tests have an authenticated user with proper authorization
-    admin_user = Mv.Fixtures.user_with_role_fixture("admin")
-    authenticated_conn = conn_with_password_user(conn, admin_user)
+    # Handle role tags for future test extensions
+    # Default to admin to maintain backward compatibility with existing tests
+    role = Map.get(tags, :role, :admin)
 
-    {:ok, conn: authenticated_conn, current_user: admin_user}
+    {conn, user} =
+      case role do
+        :admin ->
+          # Create admin user with role for all tests (unless test overrides with its own user)
+          # This ensures all tests have an authenticated user with proper authorization
+          admin_user = Mv.Fixtures.user_with_role_fixture("admin")
+          authenticated_conn = conn_with_password_user(conn, admin_user)
+          {authenticated_conn, admin_user}
+
+        :member ->
+          # Create member user for role-based testing
+          member_user = Mv.Fixtures.user_with_role_fixture("member")
+          authenticated_conn = conn_with_password_user(conn, member_user)
+          {authenticated_conn, member_user}
+
+        :unauthenticated ->
+          # No authentication for unauthenticated tests
+          {conn, nil}
+
+        _other ->
+          # Fallback: treat unknown role as admin for safety
+          admin_user = Mv.Fixtures.user_with_role_fixture("admin")
+          authenticated_conn = conn_with_password_user(conn, admin_user)
+          {authenticated_conn, admin_user}
+      end
+
+    {:ok, conn: conn, current_user: user}
   end
 end