implemented comprehensive accessibility (A11y) support across the app

lib/view/login/widgets/login_branding.dart

@@ -7,11 +7,14 @@ class LoginHeader extends StatelessWidget {
   Widget build(BuildContext context) => Column(
     children: [
       const SizedBox(height: 40),
-      Image.asset(
-        'assets/logo/icon.png',
-        height: 110,
-        fit: BoxFit.contain,
-        gaplessPlayback: true,
+      // Dekoratives Logo – der Schulname steht direkt darunter als Text.
+      const ExcludeSemantics(
+        child: Image(
+          image: AssetImage('assets/logo/icon.png'),
+          height: 110,
+          fit: BoxFit.contain,
+          gaplessPlayback: true,
+        ),
       ),
       const SizedBox(height: 20),
       const Text(