Add admin-only "All Events Log" feature with WebSocket integration.

- Implemented an "All Events Log" section accessible only to admin users.
- Added WebSocket-based data fetching to retrieve all events from the relay.
- Included profile caching and metadata fetching for event authors.
- Updated UI components to display events with expandable raw JSON details.
- Adjusted CSS for avatar sizes and improved layout.
- Refactored logout logic to reset all event states.

app/web/src/styles.css

@@ -130,8 +130,8 @@ button:hover {
 }
 
 .user-avatar {
-  width: 40px;
-  height: 40px;
+  width: 2em;
+  height: 2em;
   border-radius: 50%;
   object-fit: cover;
   border: 2px solid white;