- Added Upkeeping → Correct catalogue order.

It now recalculates video sort_order from created_at newest-first, so 
videos with corrected/original publish dates appear first in the 
homepage and public catalogue. I also updated 
catalogue/admin/latest-video ordering to use publish date as a 
tie-breaker after stored sort order.

admin/index.php

@@ -59,6 +59,12 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST') {
         if ($result['not_found']) $msg .= ', ' . $result['not_found'] . ' without a readable external count';
         $msg .= '.';
     }
+
+    if ($action === 'correct_catalogue_order') {
+        $result = media_correct_catalogue_sort_order();
+        $msg = 'Upkeeping checked ' . $result['checked'] . ' video' . ($result['checked'] === 1 ? '' : 's') . ': ';
+        $msg .= $result['updated'] . ' video' . ($result['updated'] === 1 ? '' : 's') . ' reordered newest-first by publish date.';
+    }
 }
 
 // Search + pagination
@@ -85,7 +91,7 @@ $list_stmt = $db->prepare("
     LEFT JOIN video_sources vs ON vs.video_id = v.id
     $where_sql
     GROUP BY v.id
-    ORDER BY v.sort_order ASC, v.id DESC
+    ORDER BY v.sort_order ASC, datetime(v.created_at) DESC, v.created_at DESC, v.id DESC
     LIMIT :limit OFFSET :offset
 ");
 foreach ($bind as $k => $val) $list_stmt->bindValue($k, $val);
@@ -95,6 +101,7 @@ $list_stmt->execute();
 $videos = $list_stmt->fetchAll();
 $youtube_timestamp_candidates = media_youtube_timestamp_candidate_count();
 $external_view_candidates = media_external_view_count_candidate_count();
+$catalogue_order_candidates = media_catalogue_order_candidate_count();
 $admin_total_views = total_video_views(false);
 
 $qs = fn($p) => '?' . http_build_query(array_filter(['q' => $search, 'page' => $p]));
@@ -236,6 +243,21 @@ render_head('Admin — TyClifford.com', '
               </button>
             </form>
           </div>
+          <div class="upkeep-row">
+            <div class="upkeep-copy">
+              <h2 class="card-title">Correct catalogue order</h2>
+              <p class="hint">
+                Rebuilds video sort order from the database publish dates so newer dated videos appear first in the homepage and public catalogue.
+                <?= $catalogue_order_candidates ?> video<?= $catalogue_order_candidates === 1 ? '' : 's' ?> can be reordered.
+              </p>
+            </div>
+            <form class="upkeep-form" method="post" action="index.php">
+              <input type="hidden" name="action" value="correct_catalogue_order">
+              <button class="btn btn-secondary btn-sm" type="submit">
+                Correct Order
+              </button>
+            </form>
+          </div>
           <div class="upkeep-row">
             <div class="upkeep-copy">
               <h2 class="card-title">Correct external view counts</h2>