fix: stop the device picker hanging on an offer

Two causes. The connect step had no timeout, so an unreachable device was
retried indefinitely instead of falling through to hold-for-later; it now
gives up after 15s and holds the offer as designed.

The picker also waited on the whole exchange, which includes a person on the
other device deciding — up to two minutes. It now closes on tap and reports
the outcome as a message, and a decline or an unanswered offer is shown as
information rather than an error, since the offer did arrive.

shared/src/commonMain/composeResources/values-es/strings.xml

@@ -348,6 +348,8 @@
     <string name="contacts_pick_device_title">Elegir un dispositivo</string>
     <string name="contacts_pick_device_empty">Ningún dispositivo está disponible ahora. Los dispositivos guardados aparecen aquí tras una transferencia.</string>
     <string name="contacts_sent_to_device">%1$s aceptó la transferencia</string>
+    <string name="contacts_declined_by_device">%1$s rechazó la transferencia</string>
+    <string name="contacts_no_answer">%1$s no respondió</string>
     <plurals name="transfer_file_count">
         <item quantity="one">%1$d archivo</item>
         <item quantity="other">%1$d archivos</item>