[Room details] DM designs (#313)

* Implement member details screen

* Add DM-only sections to the room details screen.

libraries/matrix/api/src/main/kotlin/io/element/android/libraries/matrix/api/permalink/PermalinkBuilder.kt

@@ -48,7 +48,7 @@ object PermalinkBuilder {
             }
             Result.success(url)
         } else {
-            Result.failure(PermalinkBuilderError.InvalidRoomAlias)
+            Result.failure(PermalinkBuilderError.InvalidUserId)
         }
     }
 
@@ -87,4 +87,5 @@ object PermalinkBuilder {
 sealed class PermalinkBuilderError : Throwable() {
     object InvalidRoomAlias : PermalinkBuilderError()
     object InvalidRoomId : PermalinkBuilderError()
+    object InvalidUserId : PermalinkBuilderError()
 }

libraries/matrix/api/src/main/kotlin/io/element/android/libraries/matrix/api/room/MatrixRoom.kt

@@ -33,6 +33,7 @@ interface MatrixRoom: Closeable {
     val topic: String?
     val avatarUrl: String?
     val isEncrypted: Boolean
+    val isDirect: Boolean
     val isPublic: Boolean
 
     suspend fun members() : List<RoomMember>
@@ -41,15 +42,17 @@ interface MatrixRoom: Closeable {
 
     fun getMember(userId: UserId): RoomMember?
 
+    fun getDmMember(): RoomMember?
+
     fun syncUpdateFlow(): Flow<Long>
 
     fun timeline(): MatrixTimeline
 
     suspend fun fetchMembers(): Result<Unit>
 
-    suspend fun userDisplayName(userId: String): Result<String?>
+    suspend fun userDisplayName(userId: UserId): Result<String?>
 
-    suspend fun userAvatarUrl(userId: String): Result<String?>
+    suspend fun userAvatarUrl(userId: UserId): Result<String?>
 
     suspend fun sendMessage(message: String): Result<Unit>
 

libraries/matrix/api/src/main/kotlin/io/element/android/libraries/matrix/api/room/RoomMember.kt

@@ -17,11 +17,12 @@
 package io.element.android.libraries.matrix.api.room
 
 import android.os.Parcelable
+import io.element.android.libraries.matrix.api.core.UserId
 import kotlinx.parcelize.Parcelize
 
 @Parcelize
 data class RoomMember(
-    val userId: String,
+    val userId: UserId,
     val displayName: String?,
     val avatarUrl: String?,
     val membership: RoomMembershipState,