feat: enhance UI, branding assets, onboarding flow, and screen layouts

lib/screens/shifts_screen.dart

@@ -10,6 +10,7 @@ import '../models/shift.dart';
 import '../state/shifts_controller.dart';
 import '../widgets/common.dart';
 import '../widgets/glass_segments.dart';
+import '../widgets/krow_wordmark.dart';
 import '../widgets/shift_card.dart';
 import '../widgets/week_strip.dart';
 
@@ -54,16 +55,10 @@ class _ShiftsScreenState extends ConsumerState<ShiftsScreen> {
             child: Column(
               crossAxisAlignment: CrossAxisAlignment.start,
               children: [
-                Text(
-                  Fmt.monthYear(DateTime.now()).toUpperCase(),
-                  style: TextStyle(
-                    fontSize: 9.5,
-                    letterSpacing: 1.6,
-                    fontWeight: FontWeight.w600,
-                    color: Colors.white.withValues(alpha: 0.5),
-                  ),
+                HeaderBrandLine(
+                  trailing: HeaderEyebrow(Fmt.monthYear(DateTime.now())),
                 ),
-                const SizedBox(height: 4),
+                const SizedBox(height: 8),
                 const Text(
                   'Shifts',
                   style: TextStyle(