feat(backoffice): breadcrumbs no layout partilhado (fecha 6.7)

includes/header.php passa a renderizar Painel > $page_title por
omissão em qualquer página que não seja o próprio painel — cobre as
34 páginas do backoffice de uma vez, sem editar cada uma. Uma página
que queira um trilho mais rico define $breadcrumbs = [['label'=>...,
'url'=>...], ..., ['label'=>'Atual']] antes de incluir o header (o
último item, sem 'url', é a página corrente).

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

includes/header.php

@@ -276,6 +276,29 @@ $app_name   = defined('APP_NAME') ? APP_NAME : 'FitMe 3070';
         <a href="<?= base_url('views/auth/logout.php') ?>" class="btn btn-sm btn-outline-danger"><i class="bi bi-box-arrow-right"></i></a>
     </div>
 </div>
+<?php
+// Breadcrumbs: a page sets $breadcrumbs = [['label'=>'Equipa','url'=>base_url('views/admin/team/index.php')], ['label'=>'Editar']]
+// (last item has no 'url' — it's the current page) for a full trail; with
+// nothing set, this falls back to Painel > $page_title, which is right for
+// every top-level listing page and wrong for nothing.
+$breadcrumbs = $breadcrumbs ?? (
+    $page_title !== 'Painel'
+        ? [['label' => 'Painel', 'url' => base_url('views/admin/dashboard.php')], ['label' => $page_title]]
+        : []
+);
+if ($breadcrumbs): ?>
+<nav aria-label="breadcrumb" class="px-3 px-md-4 pt-3">
+    <ol class="breadcrumb mb-0 small">
+        <?php foreach ($breadcrumbs as $__i => $__bc): ?>
+        <?php if (!empty($__bc['url']) && $__i < count($breadcrumbs) - 1): ?>
+        <li class="breadcrumb-item"><a href="<?= htmlspecialchars($__bc['url']) ?>"><?= htmlspecialchars($__bc['label']) ?></a></li>
+        <?php else: ?>
+        <li class="breadcrumb-item active" aria-current="page"><?= htmlspecialchars($__bc['label']) ?></li>
+        <?php endif; ?>
+        <?php endforeach; ?>
+    </ol>
+</nav>
+<?php endif; ?>
 <div class="p-3 p-md-4">
 <?php
 // Show flash messages if any