Decouple video grid from video tile components

This is an attempt to address the feedback in https://github.com/vector-im/element-call/pull/1099#discussion_r1226863404 that the video grid and video tile components have become too tightly coupled. After this change, the only requirements that the video grid makes of its child components are:

- They accept ref, style, and item props
- They attach the ref and styles to a react-spring animated element

Note: I removed the video grid Storybook file, because I'm not aware of anyone using Storybook for development of Element Call beyond Robert, and it would take some effort to fix to work with these changes.

src/room/InCallView.module.css

@@ -82,17 +82,21 @@ limitations under the License.
   bottom: 0;
 }
 
-.avatar {
-  position: absolute;
-  top: 50%;
-  left: 50%;
-  transform: translate(-50%, -50%);
-  /* To make avatars scale smoothly with their tiles during animations, we
-  override the styles set on the element */
-  --avatarSize: calc(min(var(--tileWidth), var(--tileHeight)) / 2);
-  width: var(--avatarSize) !important;
-  height: var(--avatarSize) !important;
-  border-radius: 10000px !important;
+/* CSS makes us put a condition here, even though all we want to do is
+unconditionally select the container so we can use cqmin units */
+@container videoTile (width > 0) {
+  .avatar {
+    position: absolute;
+    top: 50%;
+    left: 50%;
+    transform: translate(-50%, -50%);
+    /* To make avatars scale smoothly with their tiles during animations, we
+    override the styles set on the element */
+    --avatarSize: 50cqmin; /* Half of the smallest dimension of the tile */
+    width: var(--avatarSize) !important;
+    height: var(--avatarSize) !important;
+    border-radius: 10000px !important;
+  }
 }
 
 @media (min-height: 300px) {

src/room/InCallView.tsx

@@ -44,12 +44,7 @@ import {
   RoomHeaderInfo,
   VersionMismatchWarning,
 } from "../Header";
-import {
-  VideoGrid,
-  useVideoGridLayout,
-  ChildrenProperties,
-} from "../video-grid/VideoGrid";
-import { VideoTileContainer } from "../video-grid/VideoTileContainer";
+import { VideoGrid, useVideoGridLayout } from "../video-grid/VideoGrid";
 import { GroupCallInspector } from "./GroupCallInspector";
 import { GridLayoutMenu } from "./GridLayoutMenu";
 import { Avatar } from "../Avatar";
@@ -77,6 +72,7 @@ import { SettingsModal } from "../settings/SettingsModal";
 import { InviteModal } from "./InviteModal";
 import { useRageshakeRequestModal } from "../settings/submit-rageshake";
 import { RageshakeRequestModal } from "./RageshakeRequestModal";
+import { VideoTile } from "../video-grid/VideoTile";
 
 const canScreenshare = "getDisplayMedia" in (navigator.mediaDevices ?? {});
 // There is currently a bug in Safari our our code with cloning and sending MediaStreams
@@ -303,7 +299,7 @@ export function InCallView({
     }
     if (maximisedParticipant) {
       return (
-        <VideoTileContainer
+        <VideoTile
           targetHeight={bounds.height}
           targetWidth={bounds.width}
           key={maximisedParticipant.id}
@@ -311,10 +307,10 @@ export function InCallView({
           getAvatar={renderAvatar}
           audioContext={audioContext}
           audioDestination={audioDestination}
-          disableSpeakingIndicator={true}
           maximised={Boolean(maximisedParticipant)}
           fullscreen={maximisedParticipant === fullscreenParticipant}
           onFullscreen={toggleFullscreen}
+          showSpeakingIndicator={false}
         />
       );
     }
@@ -325,17 +321,16 @@ export function InCallView({
         layout={layout}
         disableAnimations={prefersReducedMotion || isSafari}
       >
-        {({ item, ...rest }: ChildrenProperties) => (
-          <VideoTileContainer
-            item={item}
+        {(props) => (
+          <VideoTile
             getAvatar={renderAvatar}
             audioContext={audioContext}
             audioDestination={audioDestination}
-            disableSpeakingIndicator={items.length < 3}
             maximised={false}
             fullscreen={false}
             onFullscreen={toggleFullscreen}
-            {...rest}
+            showSpeakingIndicator={items.length > 2}
+            {...props}
           />
         )}
       </Grid>