Fix room list often showing the wrong icons for calls (#32881)

* Give rooms with calls a proper accessible description

Besides improving accessibility, this makes it possible to check for the presence of a call indicator in the room list in Playwright tests.

* Make room list react to calls in a room, even when not connected to them

To use the results of CallStore.getRoom reactively, you need to listen for Call events, not ConnectedCalls events.

* Don't assume that every call starts off as a video call

If a Call object is created by way of someone starting a voice call, then of course the call's initial type needs to be 'voice'.

* Make room list items react to changes in call type

The type of a call may change over time; therefore room list items explicitly need to react to the changes.

* Update a call's type before notifying listeners of the change

If we notify listeners of a change in a call's type before actually making that change, the listeners will be working with glitched state. This would cause the room list to show the wrong call type in certain situations.

* Ignore the Vitest attachments directory

apps/web/test/test-utils/call.ts

@@ -18,6 +18,7 @@ import {
     RoomStateEvent,
     type IContent,
 } from "matrix-js-sdk/src/matrix";
+import { CallType } from "matrix-js-sdk/src/webrtc/call";
 import { mocked, type Mocked } from "jest-mock";
 import { type MatrixRTCSession } from "matrix-js-sdk/src/matrixrtc";
 
@@ -52,6 +53,7 @@ export class MockedCall extends Call {
                 waitForIframeLoad: false,
             },
             room.client,
+            CallType.Video,
         );
         this.groupCall = { creationTs: this.event.getTs() } as unknown as GroupCall;
     }