Chat tabs können durch erneutes auswählen geschlossen werden

apps/dispatch/app/_components/left/Chat.tsx

@@ -139,7 +139,13 @@ export const Chat = () => {
 									<Fragment key={userId}>
 										<a
 											className={cn("indicator tab", selectedChat === userId && "tab-active")}
-											onClick={() => setSelectedChat(userId)}
+											onClick={() => {
+												if (selectedChat === userId) {
+													setSelectedChat(null);
+													return;
+												}
+												setSelectedChat(userId);
+											}}
 										>
 											{chat.name}
 											{chat.notification && <span className="indicator-item status status-info" />}