Fix double + in WhatsApp support number

Display: only prepend + if number doesn't already start with +
URL: strip + and spaces so WhatsApp API receives digits only

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

lib/ui/views/support_view.dart

@@ -267,14 +267,16 @@ class SupportView extends StatelessWidget {
                       iconColor: const Color(0xFF25D366),
                       label: 'WhatsApp',
                       subtitle: settings.numeroSoporte.isNotEmpty
-                          ? '+${settings.numeroSoporte}'
+                          ? (settings.numeroSoporte.startsWith('+')
+                              ? settings.numeroSoporte
+                              : '+${settings.numeroSoporte}')
                           : 'No configurado',
                       isDark: isDark,
                       cardBg: cardBg,
                       borderColor: borderColor,
                       onTap: settings.numeroSoporte.isNotEmpty
                           ? () => _launchURL(
-                              'https://api.whatsapp.com/send?phone=${settings.numeroSoporte}&text=${Uri.encodeComponent('Hola, soy usuario de ProsApp')}')
+                              'https://api.whatsapp.com/send?phone=${settings.numeroSoporte.replaceAll('+', '').replaceAll(' ', '')}&text=${Uri.encodeComponent('Hola, soy usuario de ProsApp')}')
                           : null,
                     ),