New ringing UI

This implements the new ringing UI by showing a placeholder tile for the participant being dialed, rather than an overlay.

src/state/CallViewModel/remoteMembers/MatrixMemberMetadata.ts

@@ -54,31 +54,6 @@ export function createRoomMembers$(
   );
 }
 
-/**
- * creates the member that this DM is with in case it is a DM (two members) otherwise null
- */
-export function createDMMember$(
-  scope: ObservableScope,
-  roomMembers$: Behavior<RoomMemberMap>,
-  matrixRoom: MatrixRoom,
-): Behavior<Pick<
-  RoomMember,
-  "userId" | "getMxcAvatarUrl" | "rawDisplayName"
-> | null> {
-  // We cannot use the normal direct check from matrix since we do not have access to the account data.
-  // use primitive member count === 2 check instead.
-  return scope.behavior(
-    roomMembers$.pipe(
-      map((membersMap) => {
-        // primitive appraoch do to no access to account data.
-        const isDM = membersMap.size === 2;
-        if (!isDM) return null;
-        return matrixRoom.getMember(matrixRoom.guessDMUserId());
-      }),
-    ),
-  );
-}
-
 /**
  * Displayname for each member of the call. This will disambiguate
  * any displayname that clashes with another member. Only members