Iterate video room designs in labs (#8499)

* Remove blank header from video room view frame

* Add video room option to space context menu

* Remove duplicate tooltips from face piles

* Factor RoomInfoLine out of SpaceRoomView

* Factor RoomPreviewCard out of SpaceRoomView

* Adapt RoomPreviewCard for video rooms

* "New video room" → "Video room"

* Add comment about unused cases in RoomPreviewCard

* Make widgets in video rooms mutable again to de-risk future upgrades

* Ensure that the video channel exists when mounting VideoRoomView

src/components/views/elements/FacePile.tsx

@@ -31,10 +31,16 @@ interface IProps extends HTMLAttributes<HTMLSpanElement> {
 
 const FacePile: FC<IProps> = ({ members, faceSize, overflow, tooltip, children, ...props }) => {
     const faces = members.map(
-        tooltip ?
-            m => <MemberAvatar key={m.userId} member={m} width={faceSize} height={faceSize} /> :
-            m => <TooltipTarget key={m.userId} label={m.name}>
-                <MemberAvatar member={m} width={faceSize} height={faceSize} viewUserOnClick={!props.onClick} />
+        tooltip
+            ? m => <MemberAvatar key={m.userId} member={m} width={faceSize} height={faceSize} hideTitle />
+            : m => <TooltipTarget key={m.userId} label={m.name}>
+                <MemberAvatar
+                    member={m}
+                    width={faceSize}
+                    height={faceSize}
+                    viewUserOnClick={!props.onClick}
+                    hideTitle
+                />
             </TooltipTarget>,
     );