android: add channel role-based send permissions

android/app/src/test/java/ru/daemonlord/messenger/data/chat/local/dao/ChatDaoTest.kt

@@ -88,6 +88,7 @@ class ChatDaoTest {
             lastMessageText = "hi",
             lastMessageType = "text",
             lastMessageCreatedAt = "2026-03-08T10:00:00Z",
+            myRole = "member",
             updatedSortAt = "2026-03-08T10:00:00Z",
         )
     }

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

@@ -49,6 +49,7 @@ class NetworkChatRepositoryTest {
             lastMessageText = "Cached message",
             lastMessageType = "text",
             lastMessageCreatedAt = "2026-03-08T10:00:00Z",
+            myRole = "member",
             updatedSortAt = "2026-03-08T10:00:00Z",
         )
 
@@ -121,6 +122,10 @@ class NetworkChatRepositoryTest {
             }
         }
 
+        override fun observeChatById(chatId: Long): Flow<ChatListLocalModel?> {
+            return chats.map { entities -> entities.firstOrNull { it.id == chatId }?.toLocalModel() }
+        }
+
         override suspend fun upsertChats(chats: List<ChatEntity>) {
             val merged = this.chats.value.associateBy { it.id }.toMutableMap()
             chats.forEach { merged[it.id] = it }
@@ -180,6 +185,7 @@ class NetworkChatRepositoryTest {
                 lastMessageText = lastMessageText,
                 lastMessageType = lastMessageType,
                 lastMessageCreatedAt = lastMessageCreatedAt,
+                myRole = myRole,
                 updatedSortAt = updatedSortAt,
             )
         }