fix: correct login heading semantics

lib/who_need_help_web/controllers/user_session_html/new.html.heex

@@ -7,7 +7,7 @@
   <div class="space-y-4">
     <div class="text-center">
       <.header>
-        <p>{gettext("Log in")}</p>
+        {gettext("Log in")}
         <:subtitle>
           <%= if @current_scope do %>
             {gettext("You need to reauthenticate to perform sensitive actions on your account.")}

test/who_need_help_web/controllers/user_session_controller_test.exs

@@ -21,6 +21,9 @@ defmodule WhoNeedHelpWeb.UserSessionControllerTest do
       assert response =~ "Use a password instead"
       assert response =~ ~s(id="magic-link-fragment-form")
       assert response =~ ~s(hidden)
+
+      assert response =~ ~r/<h1[^>]*>\s*Log in\s*<\/h1>/s
+      refute response =~ ~r/<h1[^>]*>\s*<p\b/s
     end
 
     test "renders login page with email filled in (sudo mode)", %{conn: conn, user: user} do