Voice broadcast indicator in room list (#9709)

res/css/_components.pcss

@@ -375,4 +375,5 @@
 @import "./voice-broadcast/atoms/_PlaybackControlButton.pcss";
 @import "./voice-broadcast/atoms/_VoiceBroadcastControl.pcss";
 @import "./voice-broadcast/atoms/_VoiceBroadcastHeader.pcss";
+@import "./voice-broadcast/atoms/_VoiceBroadcastRoomSubtitle.pcss";
 @import "./voice-broadcast/molecules/_VoiceBroadcastBody.pcss";

res/css/voice-broadcast/atoms/_VoiceBroadcastRoomSubtitle.pcss

@@ -0,0 +1,22 @@
+/*
+Copyright 2022 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+.mx_RoomTile .mx_RoomTile_titleContainer .mx_RoomTile_subtitle.mx_RoomTile_subtitle--voice-broadcast {
+    align-items: center;
+    color: $alert;
+    display: flex;
+    gap: $spacing-4;
+}