android: add mention override for muted chat notifications

android/app/src/test/java/ru/daemonlord/messenger/data/chat/repository/NetworkChatRepositoryTest.kt

@@ -141,6 +141,10 @@ class NetworkChatRepositoryTest {
             return chats.value.firstOrNull { it.id == chatId }?.displayTitle
         }
 
+        override suspend fun isChatMuted(chatId: Long): Boolean? {
+            return chats.value.firstOrNull { it.id == chatId }?.muted
+        }
+
         override suspend fun upsertChats(chats: List<ChatEntity>) {
             val merged = this.chats.value.associateBy { it.id }.toMutableMap()
             chats.forEach { merged[it.id] = it }

android/app/src/test/java/ru/daemonlord/messenger/data/realtime/RealtimeEventParserTest.kt

@@ -2,6 +2,7 @@ package ru.daemonlord.messenger.data.realtime
 
 import kotlinx.serialization.json.Json
 import org.junit.Assert.assertEquals
+import org.junit.Assert.assertFalse
 import org.junit.Assert.assertTrue
 import org.junit.Test
 import ru.daemonlord.messenger.domain.realtime.model.RealtimeEvent
@@ -70,6 +71,33 @@ class RealtimeEventParserTest {
         assertEquals(5L, mapped.senderId)
         assertEquals(100L, mapped.replyToMessageId)
         assertEquals("hi", mapped.text)
+        assertFalse(mapped.isMention)
+    }
+
+    @Test
+    fun parseReceiveMessage_withMentionFlag_mapsMention() {
+        val payload = """
+            {
+              "event": "receive_message",
+              "payload": {
+                "chat_id": 88,
+                "message": {
+                  "id": 9002,
+                  "chat_id": 88,
+                  "sender_id": 5,
+                  "type": "text",
+                  "text": "@you hi",
+                  "created_at": "2026-03-08T12:00:00Z",
+                  "is_mention": true
+                }
+              }
+            }
+        """.trimIndent()
+
+        val event = parser.parse(payload)
+        assertTrue(event is RealtimeEvent.ReceiveMessage)
+        val mapped = event as RealtimeEvent.ReceiveMessage
+        assertTrue(mapped.isMention)
     }
 
     @Test