feat(aiturk): say when AITURK IDE is closed in the chat banner

When the tunnel reports that no computer is attached (close 4503) the
reconnect banner now says that AITURK IDE is not open or Phone
connection is off, instead of an endless 'reconnecting'.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01B8ppceaR5s6cvMnm7uGRnf

app/src/main/java/com/m57/hermescontrol/data/ws/WsTransport.kt

@@ -730,6 +730,8 @@ internal class WsTransport(
                 // Do NOT log [reason] — it may carry server-side context. The
                 // reason is still inspected internally to detect auth failures.
                 Log.i(TAG, "WebSocket closed: $code")
+                com.m57.hermescontrol.data.aiturk.AiturkRelayStatus
+                    .onSocketEnded(null)
                 connected.set(false)
                 ActiveSessionHolder.clear()
                 connectionHealth.stop()
@@ -764,6 +766,10 @@ internal class WsTransport(
                 connectionHealth.stop()
                 rpcChannel.clearCapabilityRequests()
                 val code = response?.code ?: 0
+                // AITURK: lets the chat banner say "AITURK IDE is not open on the
+                // computer" when the tunnel reports that no host is attached.
+                com.m57.hermescontrol.data.aiturk.AiturkRelayStatus
+                    .onSocketEnded(t)
                 if (code == 401 || code == 4401 || code == 4403 ||
                     t.message?.contains("401") == true ||
                     t.message?.contains("4401") == true ||

app/src/main/java/com/m57/hermescontrol/ui/chat/components/ChatConnectionBanner.kt

@@ -17,6 +17,8 @@ import androidx.compose.material3.Surface
 import androidx.compose.material3.Text
 import androidx.compose.material3.TextButton
 import androidx.compose.runtime.Composable
+import androidx.compose.runtime.collectAsState
+import androidx.compose.runtime.getValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.res.stringResource
@@ -70,13 +72,20 @@ fun ChatConnectionBanner(
                             color = LocalHermesStatusColors.current.error,
                         )
                     }
+                    // AITURK: over the relay, say why the reconnect keeps failing.
+                    val aiturkHostOffline by com.m57.hermescontrol.data.aiturk.AiturkRelayStatus.hostOffline
+                        .collectAsState()
+                    val hostOffline = aiturkHostOffline && connectionStatus == ConnectionStatus.RECONNECTING
                     Text(
                         modifier = Modifier.weight(1f, fill = false),
-                        maxLines = 1,
+                        maxLines = if (hostOffline) 3 else 1,
                         overflow = TextOverflow.Ellipsis,
                         text =
                             when (connectionStatus) {
-                                ConnectionStatus.RECONNECTING -> stringResource(R.string.chat_status_reconnecting)
+                                ConnectionStatus.RECONNECTING ->
+                                    stringResource(
+                                        if (hostOffline) R.string.aiturk_status_host_offline else R.string.chat_status_reconnecting,
+                                    )
                                 ConnectionStatus.DISCONNECTED -> stringResource(R.string.chat_status_disconnected)
                                 ConnectionStatus.NO_NETWORK -> stringResource(R.string.chat_status_no_network)
                                 ConnectionStatus.AUTH_EXPIRED -> stringResource(R.string.chat_status_auth_expired)