perf(#518): wrap NotificationReplyReceiver work in withContext(Dispatchers.IO) (#518)

Explicit IO context for DB/WS/notify path. replyScope already uses
Dispatchers.IO; this makes the offload local and explicit. Keep return@withContext
only because nothing follows the withContext block today.

app/src/main/java/com/m57/hermescontrol/notification/NotificationReplyReceiver.kt

@@ -13,6 +13,7 @@ import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.SupervisorJob
 import kotlinx.coroutines.launch
+import kotlinx.coroutines.withContext
 import kotlinx.coroutines.withTimeout
 
 open class NotificationReplyReceiver : BroadcastReceiver() {
@@ -60,13 +61,17 @@ open class NotificationReplyReceiver : BroadcastReceiver() {
             replyScope.launch {
                 try {
                     withTimeout(5000L) {
+                        withContext(Dispatchers.IO) {
                             val db =
                                 com.m57.hermescontrol.data.local.HermesDatabase
                                     .get(context)
                             val dao = db.chatMessageDao()
                             if (!dao.sessionExists(sessionId)) {
-                            android.util.Log.w("NotificationReply", "Ignoring reply for unknown session: $sessionId")
-                            return@withTimeout
+                                android.util.Log.w(
+                                    "NotificationReply",
+                                    "Ignoring reply for unknown session: $sessionId",
+                                )
+                                return@withContext
                             }
 
                             HermesWsClient.sendMessage(sessionId, replyText)
@@ -88,6 +93,7 @@ open class NotificationReplyReceiver : BroadcastReceiver() {
                             val manager = context.getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager
                             manager.notify(ChatNotificationService.PENDING_NOTIFICATION_ID, repliedNotification)
                         }
+                    }
                 } catch (e: Exception) {
                     android.util.Log.e("NotificationReply", "Failed to process reply", e)
                 } finally {