feat(#142): ouvrir la modale au clic sur les cartes du dashboard admin.

Squash merge develop → master.

Co-authored-by: Cursor <cursoragent@cursor.com>

frontend/lib/widgets/admin/pending_validation_widget.dart

@@ -321,11 +321,12 @@ class _PendingValidationRowState extends State<_PendingValidationRow> {
     return MouseRegion(
       onEnter: (_) => setState(() => _isHovered = true),
       onExit: (_) => setState(() => _isHovered = false),
+      cursor: SystemMouseCursors.click,
       child: Material(
         color: Colors.transparent,
         borderRadius: BorderRadius.circular(10),
         child: InkWell(
-          onTap: () {},
+          onTap: widget.onOpen,
           borderRadius: BorderRadius.circular(10),
           hoverColor: const Color(0x149CC5C0),
           child: Card(