Space never presses a focused button; chat toasts open the chat; plain wheel always scrolls the page

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

apps/desktop/lib/src/shell/app_shell.dart

@@ -669,7 +669,11 @@ class AppShellState extends State<AppShell> with SingleTickerProviderStateMixin
             ),
           ),
           if (online && _shown != PlayerMode.none) _playerLayer(area),
-          Positioned(left: 16, bottom: _fullscreen ? 90 : 16, child: const PartyToasts()),
+          Positioned(left: 16, bottom: _fullscreen ? 90 : 16, child: PartyToasts(
+            onOpenChat: () {
+              if (!_chatOpen) _toggleChat();
+            },
+          )),
         ],
       );
     });