Fix room alias mention triggering room-wide notifications (#2562)

* fix: prevent room alias mentions from triggering @room notifications

* fix: Simplify room mention to exact match on @room

src/app/components/editor/output.ts

@@ -212,9 +212,10 @@ export const getMentions = (mx: MatrixClient, roomId: string, editor: Editor): M
     if (node.type === BlockType.CodeBlock) return;
 
     if (node.type === BlockType.Mention) {
-      if (node.id === getCanonicalAliasOrRoomId(mx, roomId)) {
+      if (node.name === '@room') {
         mentionData.room = true;
       }
+      
       if (isUserId(node.id) && node.id !== mx.getUserId()) {
         mentionData.users.add(node.id);
       }