replace orphaned tailwind classes with project CSS

auth pages (login, registration, confirmation, recover) now use
setup-page/setup-header/admin-btn-block. theme toggle indicator
gets proper CSS. cleaned up dead h-full, size-3.5, ml-2 classes.

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

lib/berrypod_web/live/admin/pages/index.ex

@@ -109,7 +109,7 @@ defmodule BerrypodWeb.Admin.Pages.Index do
               <span class="page-card-info">
                 <span class="page-card-title">
                   {page.title}
-                  <span :if={!page.published} class="admin-badge admin-badge-warning ml-2">
+                  <span :if={!page.published} class="admin-badge admin-badge-warning ml-1">
                     Draft
                   </span>
                 </span>