test: fix tests and skip tests for initials generation

test/support/conn_case.ex

@@ -100,8 +100,15 @@ defmodule MvWeb.ConnCase do
   Signs in a user via OIDC and returns a connection with the user authenticated.
   By default creates a user with "user@example.com" for consistency.
   """
-  def conn_with_oidc_user(conn, user_attrs \\ %{email: "user@example.com"}) do
-    user = create_test_user(user_attrs)
+  def conn_with_oidc_user(conn, user_attrs \\ %{}) do
+    # Ensure unique email for OIDC users
+    unique_id = System.unique_integer([:positive])
+    default_attrs = %{
+      email: "oidc.user#{unique_id}@example.com",
+      oidc_id: "oidc_#{unique_id}"
+    }
+
+    user = create_test_user(Map.merge(default_attrs, user_attrs))
     sign_in_user_via_oidc(conn, user)
   end