The devices section stops printing a cap it does not know

Same as the iOS screen: it said "N of 3 registered" while the cap is the
relay's `FN_MAX_DEVICES`. Production runs six, so an account at the limit
read "6 of 3 registered" on the screen people are sent to when they are
told they have too many devices.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

app/src/main/kotlin/io/flamenet/messenger/app/ChatScreens.kt

@@ -3434,7 +3434,11 @@ fun ContactListPrivacySection(model: MessengerViewModel) {
 
 /**
  * The account's registered devices, every one is a full mailbox and a prekey
- * pool on the relay, which caps them at three.
+ * pool on the relay.
+ *
+ * The cap is the relay's (`FN_MAX_DEVICES`), not the app's, and it is not
+ * three: production runs six, and a self-hoster picks their own. This said
+ * "of 3", so an account at the limit read "6 of 3 registered".
  */
 @Composable
 fun RegisteredDevicesSection(
@@ -3446,7 +3450,7 @@ fun RegisteredDevicesSection(
 
     Text("Registered devices", style = MaterialTheme.typography.titleMedium)
     Text(
-        "${phase.registeredDevices.size} of 3 registered. Each device holds its " +
+        "${phase.registeredDevices.size} registered. Each device holds its " +
             "own keys and its own mailbox; removing one deletes its undelivered " +
             "messages and signs it out for good.",
         fontSize = 12.sp,