feat: UI/UX mejorado en servicios, historial, solicitar profesional y logo

- logo.dart: path correcto assets/prosapp-logo.png + errorBuilder
- services_view.dart: rediseño con tarjetas, dark mode, avatar con inicial, badges de estado
- services_history_view.dart: mismo rediseño + badges completado/cancelado/rechazado
- request_professional_view.dart: secciones con cards, botones de upload con estado visual,
  estados pending/rejected mejorados, dark mode completo

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

lib/ui/shared/widgets/logo.dart

@@ -24,9 +24,18 @@ class Logo extends StatelessWidget {
               ],
             ),
             child: Image.asset(
-              'prosapp-logo.png',
+              'assets/prosapp-logo.png',
               height: 38,
               fit: BoxFit.contain,
+              errorBuilder: (_, __, ___) => const Text(
+                'ProsApp',
+                textAlign: TextAlign.center,
+                style: TextStyle(
+                  fontSize: 20,
+                  fontWeight: FontWeight.bold,
+                  color: Color(0xFF42A4EF),
+                ),
+              ),
             ),
           ),
           const SizedBox(height: 10),