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

lib/screens/shift_detail_screen.dart

@@ -152,8 +152,15 @@ class ShiftDetailScreen extends ConsumerWidget {
                     ],
                   ),
                 ),
-                const SectionLabel('Requirements'),
-                _Requirements(shift: shift),
+                SectionLabel(
+                  'Requirements',
+                  trailing: TextButton(
+                    onPressed: () =>
+                        context.push('/shift/${shift.id}/requirements'),
+                    child: const Text('See all'),
+                  ),
+                ),
+                ShiftRequirements(shift: shift),
                 const SizedBox(height: 18),
                 _Actions(shift: shift),
               ],
@@ -166,8 +173,9 @@ class ShiftDetailScreen extends ConsumerWidget {
 }
 
 /// What this business asks for, checked against what is already on file.
-class _Requirements extends ConsumerWidget {
-  const _Requirements({required this.shift});
+/// Shown inline on the shift, and on its own screen from the link above it.
+class ShiftRequirements extends ConsumerWidget {
+  const ShiftRequirements({super.key, required this.shift});
 
   final Shift shift;