rework setup wizard into phased flow

phase 1 (no admin): show only the email form
phase 2 (admin created, not logged in): "check your inbox" gate with
  "wrong email? start over" link that deletes the unconfirmed user
phase 3 (logged in via magic link): show provider + stripe steps

removes the confusing redirect to /users/log-in after account creation.
users now stay on /setup throughout the entire setup process.

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

test/berrypod_web/live/setup/onboarding_test.exs

@@ -4,7 +4,7 @@ defmodule BerrypodWeb.Setup.OnboardingTest do
   import Phoenix.LiveViewTest
   import Berrypod.AccountsFixtures
 
-  alias Berrypod.{Products, Settings}
+  alias Berrypod.{Accounts, Products, Settings}
 
   describe "access rules" do
     test "accessible on fresh install (no admin)", %{conn: conn} do
@@ -30,11 +30,12 @@ defmodule BerrypodWeb.Setup.OnboardingTest do
       assert {:live_redirect, %{to: "/admin"}} = redirect
     end
 
-    test "redirects to login when admin exists but not logged in", %{conn: conn} do
-      _user = user_fixture()
+    test "shows check inbox when admin exists but not logged in", %{conn: conn} do
+      _user = unconfirmed_user_fixture()
 
-      {:error, redirect} = live(conn, ~p"/setup")
-      assert {:live_redirect, %{to: "/users/log-in"}} = redirect
+      {:ok, _view, html} = live(conn, ~p"/setup")
+      assert html =~ "Check your inbox"
+      refute html =~ "Connect a print provider"
     end
 
     test "redirects to / when site is already live", %{conn: conn} do
@@ -56,11 +57,50 @@ defmodule BerrypodWeb.Setup.OnboardingTest do
     end
   end
 
-  describe "sections" do
-    test "shows all three sections on fresh install", %{conn: conn} do
+  describe "phase: email form" do
+    test "shows only email form on fresh install", %{conn: conn} do
       {:ok, _view, html} = live(conn, ~p"/setup")
 
       assert html =~ "Create admin account"
+      refute html =~ "Connect a print provider"
+      refute html =~ "Connect payments"
+    end
+  end
+
+  describe "phase: check inbox" do
+    test "shows check inbox after creating account", %{conn: conn} do
+      {:ok, view, _html} = live(conn, ~p"/setup")
+
+      html =
+        view
+        |> form("form", account: %{email: "admin@example.com"})
+        |> render_submit()
+
+      assert html =~ "Check your inbox"
+      assert html =~ "admin@example.com"
+      refute html =~ "Connect a print provider"
+    end
+
+    test "start over resets to email form", %{conn: conn} do
+      _user = unconfirmed_user_fixture()
+
+      {:ok, view, _html} = live(conn, ~p"/setup")
+
+      html = render_click(view, "start_over")
+
+      assert html =~ "Create admin account"
+      refute html =~ "Check your inbox"
+      refute Accounts.has_admin?()
+    end
+  end
+
+  describe "phase: configure (logged in)" do
+    setup :register_and_log_in_user
+
+    test "shows provider and stripe steps", %{conn: conn, user: user} do
+      {:ok, _view, html} = live(conn, ~p"/setup")
+
+      assert html =~ user.email
       assert html =~ "Connect a print provider"
       assert html =~ "Connect payments"
     end
@@ -85,9 +125,7 @@ defmodule BerrypodWeb.Setup.OnboardingTest do
       assert html =~ "API token"
       assert html =~ "Printify"
     end
-  end
 
-  describe "stripe section" do
     test "shows stripe form", %{conn: conn} do
       {:ok, _view, html} = live(conn, ~p"/setup")