Don't show toolbar buttons on connecting tiles

Because connecting tiles don't have a feed, clicking the local volume button would cause a soft crash. This also fixes a few strict mode errors in the surrounding area while we're at it.

src/video-grid/useCallFeed.ts

@@ -19,17 +19,18 @@ import { CallFeed, CallFeedEvent } from "matrix-js-sdk/src/webrtc/callFeed";
 import { SDPStreamMetadataPurpose } from "matrix-js-sdk/src/webrtc/callEventTypes";
 
 interface CallFeedState {
-  callFeed: CallFeed;
+  callFeed: CallFeed | undefined;
   isLocal: boolean;
   speaking: boolean;
   videoMuted: boolean;
   audioMuted: boolean;
   localVolume: number;
-  disposed: boolean;
-  stream: MediaStream;
-  purpose: SDPStreamMetadataPurpose;
+  disposed: boolean | undefined;
+  stream: MediaStream | undefined;
+  purpose: SDPStreamMetadataPurpose | undefined;
 }
-function getCallFeedState(callFeed: CallFeed): CallFeedState {
+
+function getCallFeedState(callFeed: CallFeed | undefined): CallFeedState {
   return {
     callFeed,
     isLocal: callFeed ? callFeed.isLocal() : false,
@@ -43,7 +44,7 @@ function getCallFeedState(callFeed: CallFeed): CallFeedState {
   };
 }
 
-export function useCallFeed(callFeed: CallFeed): CallFeedState {
+export function useCallFeed(callFeed: CallFeed | undefined): CallFeedState {
   const [state, setState] = useState<CallFeedState>(() =>
     getCallFeedState(callFeed)
   );