AeroToss: исправлен поиск после потери связи + убрана лишняя кнопка

- onBroadcastReceived: обновляет device если IP/name изменились
- Убрана FAB 'Обновить' внизу (осталась TextButton 'Обновить' справа)
- Устройства снова видят друг друга после переподключения

app/src/commonMain/kotlin/com/aerotoss/discovery/TcpDiscovery.kt

@@ -151,10 +151,20 @@ class TcpDiscovery(
             if (remoteId == deviceId) return
             if (remoteServicePort == myServicePort) return
 
-            // Skip if already known
-            if (discoveredDevices.containsKey(remoteId)) return
-
             val host = pkt.address.hostAddress ?: return
+
+            // Update existing device if IP or name changed (e.g. after reconnect)
+            val existing = discoveredDevices[remoteId]
+            if (existing != null) {
+                if (existing.hostAddress != host || existing.name != remoteName) {
+                    val updated = existing.copy(hostAddress = host, name = remoteName)
+                    discoveredDevices[remoteId] = updated
+                    _devices.value = discoveredDevices.values.toList()
+                }
+                return
+            }
+
+            // New device - query it
             val device = queryRemote(host, remoteTcpPort)
             if (device != null) {
                 discoveredDevices[device.id] = device

app/src/commonMain/kotlin/com/aerotoss/ui/screens/HomeScreen.kt

@@ -35,13 +35,6 @@ fun HomeScreen(
             )
         },
         floatingActionButton = {
-            Row(horizontalArrangement = Arrangement.spacedBy(16.dp)) {
-                FloatingActionButton(
-                    onClick = { manager.rescan() },
-                    containerColor = MaterialTheme.colorScheme.tertiaryContainer
-                ) {
-                    Text("Обновить", style = MaterialTheme.typography.labelLarge)
-                }
             FloatingActionButton(
                 onClick = onReceiveClick,
                 containerColor = MaterialTheme.colorScheme.secondaryContainer
@@ -49,7 +42,6 @@ fun HomeScreen(
                 Text("Получить", style = MaterialTheme.typography.labelLarge)
             }
         }
-        }
     ) { padding ->
         Column(
             modifier = Modifier