feat(site): navbar links only sections with content, Galeria link, brand-tinted gallery background

config/functions_site.php

@@ -29,16 +29,37 @@ function site_info(PDO $pdo, ?int $gym_id = null): array {
     return $row;
 }
 
+/** Whether the home page renders section $sec for $gym (same data checks as site/index.php). */
+function site_section_has_content(array $gym, string $sec): bool {
+    $pdo = $GLOBALS['pdo'] ?? null;
+    $gid = (int) $gym['id'];
+    if (!$pdo && $sec !== 'galeria') return true;
+    return match ($sec) {
+        'modalidades'  => (bool) site_modalidades($pdo, $gid),
+        'equipa'       => (bool) site_team_active($pdo, $gid),
+        'horario'      => (bool) site_horario($pdo, '', $gid),
+        'mensalidades' => (bool) site_memberships($pdo, $gid),
+        'galeria'      => !empty($gym['gallery_id']) && preg_grep('/\.(jpe?g|png|gif|webp|jxl)$/i',
+                              glob(dirname(__DIR__) . '/uploads/gallery/' . (int) $gym['gallery_id'] . '/*') ?: []),
+        default        => true,
+    };
+}
+
+/** Team members shown on the site (status «ativo»). */
+function site_team_active(PDO $pdo, ?int $gym_id = null): array {
+    return array_values(array_filter(site_team($pdo, $gym_id), fn($d) => ($d['status'] ?? '') === 'ativo'));
+}
+
 // Top navigation (label => absolute URL): anchors on the gym's own page, only
-// for the sections that gym shows, plus its CrossFit page when it has one.
+// for the sections that gym shows and has content for, plus its CrossFit page when it has one.
 function site_navbar(?array $gym = null): array {
     $gym = $gym ?? current_gym();
     $items = ['Home' => ['#home', null]];
-    foreach (['Modalidades' => 'modalidades', 'Equipa' => 'equipa', 'Horário' => 'horario',
+    foreach (['Galeria' => 'galeria', 'Modalidades' => 'modalidades', 'Equipa' => 'equipa', 'Horário' => 'horario',
               'Mensalidades' => 'mensalidades', 'Contactos' => 'contactos'] as $label => $sec) {
         if (!gym_section_on($gym, $sec)) continue;
-        // No active plans → the section isn't rendered, so no link to it either.
-        if ($sec === 'mensalidades' && !empty($GLOBALS['pdo']) && !site_memberships($GLOBALS['pdo'], (int) $gym['id'])) continue;
+        // A section with nothing to show isn't rendered, so no link to it either.
+        if (!site_section_has_content($gym, $sec)) continue;
         $items[$label] = ['#' . $sec, $sec];
     }
     $nav = [];