fix signed_in_path to always redirect to /admin after login

Single-tenant app: every user is the admin. The previous pattern
match on conn.assigns.current_scope didn't work for first-time
logins because the scope isn't assigned to the conn yet at that
point, causing the fallback to ~p"/" instead of ~p"/admin".

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

lib/simpleshop_theme_web/user_auth.ex

@@ -257,12 +257,8 @@ defmodule SimpleshopThemeWeb.UserAuth do
   end
 
   @doc "Returns the path to redirect to after log in."
-  # the user was already logged in, redirect to admin dashboard
+  # Single-tenant: every user is the admin, always go to dashboard
-  def signed_in_path(%Plug.Conn{assigns: %{current_scope: %Scope{user: %Accounts.User{}}}}) do
+  def signed_in_path(_), do: ~p"/admin"
-    ~p"/admin"
-  end
-
-  def signed_in_path(_), do: ~p"/"
 
   @doc """
   Plug for routes that require the user to be authenticated.

test/simpleshop_theme_web/controllers/user_session_controller_test.exs

@@ -18,7 +18,7 @@ defmodule SimpleshopThemeWeb.UserSessionControllerTest do
         })
 
       assert get_session(conn, :user_token)
-      assert redirected_to(conn) == ~p"/"
+      assert redirected_to(conn) == ~p"/admin"
 
       # Now do a logged in request and assert on the page content
       conn = get(conn, ~p"/admin/settings")
@@ -39,7 +39,7 @@ defmodule SimpleshopThemeWeb.UserSessionControllerTest do
         })
 
       assert conn.resp_cookies["_simpleshop_theme_web_user_remember_me"]
-      assert redirected_to(conn) == ~p"/"
+      assert redirected_to(conn) == ~p"/admin"
     end
 
     test "logs the user in with return to", %{conn: conn, user: user} do
@@ -80,7 +80,7 @@ defmodule SimpleshopThemeWeb.UserSessionControllerTest do
         })
 
       assert get_session(conn, :user_token)
-      assert redirected_to(conn) == ~p"/"
+      assert redirected_to(conn) == ~p"/admin"
 
       # Now do a logged in request and assert on the page content
       conn = get(conn, ~p"/admin/settings")
@@ -99,7 +99,7 @@ defmodule SimpleshopThemeWeb.UserSessionControllerTest do
         })
 
       assert get_session(conn, :user_token)
-      assert redirected_to(conn) == ~p"/"
+      assert redirected_to(conn) == ~p"/admin"
       assert Phoenix.Flash.get(conn.assigns.flash, :info) =~ "User confirmed successfully."
 
       assert Accounts.get_user!(user.id).confirmed_at

test/simpleshop_theme_web/live/auth/confirmation_test.exs

@@ -64,7 +64,7 @@ defmodule SimpleshopThemeWeb.Auth.ConfirmationTest do
       assert Accounts.get_user!(user.id).confirmed_at
       # we are logged in now
       assert get_session(conn, :user_token)
-      assert redirected_to(conn) == ~p"/"
+      assert redirected_to(conn) == ~p"/admin"
 
       # log out, new conn
       conn = build_conn()

test/simpleshop_theme_web/live/auth/login_test.exs

@@ -56,7 +56,7 @@ defmodule SimpleshopThemeWeb.Auth.LoginTest do
 
       conn = submit_form(form, conn)
 
-      assert redirected_to(conn) == ~p"/"
+      assert redirected_to(conn) == ~p"/admin"
     end
 
     test "redirects to login page with a flash error if credentials are invalid", %{

test/simpleshop_theme_web/live/auth/registration_test.exs

@@ -25,7 +25,7 @@ defmodule SimpleshopThemeWeb.Auth.RegistrationTest do
         conn
         |> log_in_user(user_fixture())
         |> live(~p"/users/register")
-        |> follow_redirect(conn, ~p"/")
+        |> follow_redirect(conn, ~p"/admin")
 
       assert {:ok, _conn} = result
     end

test/simpleshop_theme_web/user_auth_test.exs

@@ -25,7 +25,7 @@ defmodule SimpleshopThemeWeb.UserAuthTest do
       conn = UserAuth.log_in_user(conn, user)
       assert token = get_session(conn, :user_token)
       assert get_session(conn, :live_socket_id) == "users_sessions:#{Base.url_encode64(token)}"
-      assert redirected_to(conn) == ~p"/"
+      assert redirected_to(conn) == ~p"/admin"
       assert Accounts.get_user_by_session_token(token)
     end