Codex: fix group layout DOM order after #3344 (#3353)

_GroupLayout.cshtml was the one sidebar-grid layout missed by PR #3344.
With _PagesNav now carrying md:order-1, the missing md:order-2 on <main>
broke the visual layout of Codex group landing pages.

Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>

Author: 2 people

src/Elastic.Codex/_GroupLayout.cshtml

@@ -13,12 +13,12 @@
 				md:px-4
 	">
 		<div class="min-h-screen grid grid-cols-1 md:grid-cols-[var(--max-sidebar-width)_1fr] gap-4">
-			@await RenderPartialAsync(_PagesNav.Create(Model))
-			<main id="content-container" class="min-w-0 lg:grid lg:grid-cols-[minmax(0,var(--max-text-width))_minmax(0,var(--max-sidebar-width))] justify-center mx-4 gap-4">
+			<main id="content-container" class="min-w-0 lg:grid lg:grid-cols-[minmax(0,var(--max-text-width))_minmax(0,var(--max-sidebar-width))] justify-center mx-4 gap-4 md:order-2">
 				<div class="min-w-0">
 					@await RenderBodyAsync()
 				</div>
 			</main>
+			@await RenderPartialAsync(_PagesNav.Create(Model))
 		</div>
 	</div>
 </div>