Accepting and declining invites

Hook up accept and decline buttons in the invites UI. Accept
will attempt to accept and then navigate to the room; decline
shows a confirmation dialog.

Fixes #106

libraries/matrix/impl/src/main/kotlin/io/element/android/libraries/matrix/impl/room/RoomSummaryDetailsFactory.kt

@@ -33,7 +33,7 @@ class RoomSummaryDetailsFactory(private val roomMessageFactory: RoomMessageFacto
             roomId = RoomId(slidingSyncRoom.roomId()),
             name = slidingSyncRoom.name() ?: slidingSyncRoom.roomId(),
             canonicalAlias = room?.canonicalAlias(),
-            isDirect = slidingSyncRoom.isDm() ?: false,
+            isDirect = room?.isDirect() ?: false,
             avatarURLString = room?.avatarUrl(),
             unreadNotificationCount = slidingSyncRoom.unreadNotifications().use { it.notificationCount().toInt() },
             lastMessage = latestRoomMessage,

libraries/matrix/impl/src/main/kotlin/io/element/android/libraries/matrix/impl/room/RustMatrixRoom.kt

@@ -206,4 +206,17 @@ class RustMatrixRoom(
             innerRoom.leave()
         }
     }
+
+    override suspend fun acceptInvitation(): Result<Unit> = withContext(coroutineDispatchers.io) {
+        kotlin.runCatching {
+            innerRoom.acceptInvitation()
+        }
+    }
+
+    override suspend fun rejectInvitation(): Result<Unit> = withContext(coroutineDispatchers.io) {
+        kotlin.runCatching {
+            innerRoom.rejectInvitation()
+        }
+    }
+
 }