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

lib/screens/today_screen.dart

@@ -13,10 +13,15 @@ import '../state/shifts_controller.dart';
 import '../widgets/collapsing_header.dart';
 import '../widgets/common.dart';
 import '../widgets/shift_card.dart';
+import '../widgets/krow_wordmark.dart';
 
 class TodayScreen extends ConsumerWidget {
   const TodayScreen({super.key});
 
+  /// Brand line (40) + gap + identity row (44) + gap + stats, plus 6/18
+  /// padding.
+  static const _expandedHeader = 188.0;
+
   String _greeting() {
     final h = DateTime.now().hour;
     if (h < 12) return 'Good morning';
@@ -39,16 +44,24 @@ class TodayScreen extends ConsumerWidget {
       body: CustomScrollView(
         slivers: [
           KrowSliverHeader(
-            expandedHeight: 152,
+            expandedHeight: _expandedHeader,
             collapsedHeight: 60,
             builder: (context, t) => HeaderCrossFade(
               t: t,
-              expandedHeight: 152,
+              expandedHeight: _expandedHeader,
               expanded: Padding(
-                padding: const EdgeInsets.fromLTRB(20, 8, 20, 20),
+                padding: const EdgeInsets.fromLTRB(20, 6, 20, 18),
                 child: Column(
                   crossAxisAlignment: CrossAxisAlignment.start,
                   children: [
+                    HeaderBrandLine(
+                      trailing: HeaderIconButton(
+                        icon: LucideIcons.messageCircle,
+                        tooltip: 'Support',
+                        onPressed: () => context.push('/support'),
+                      ),
+                    ),
+                    const SizedBox(height: 14),
                     Row(
                       children: [
                         _Avatar(worker.initials),
@@ -69,6 +82,8 @@ class TodayScreen extends ConsumerWidget {
                               const SizedBox(height: 2),
                               Text(
                                 worker.name,
+                                maxLines: 1,
+                                overflow: TextOverflow.ellipsis,
                                 style: const TextStyle(
                                   fontSize: 22,
                                   fontWeight: FontWeight.w700,
@@ -79,14 +94,9 @@ class TodayScreen extends ConsumerWidget {
                             ],
                           ),
                         ),
-                        HeaderIconButton(
-                          icon: LucideIcons.messageCircle,
-                          tooltip: 'Support',
-                          onPressed: () => context.push('/support'),
-                        ),
                       ],
                     ),
-                    const SizedBox(height: 18),
+                    const SizedBox(height: 16),
                     Row(
                       children: [
                         // Flexible, not free-sized: on a 320px screen the two