fix: someone removed from a group keeps a chat shared with that group open (#32535)

When an admin took someone out of a group, a chat shared with that group with "Allow replies" stayed open on that person's screen, message box included. Changing a group drops that person's live connection, and when it came back the chat was only checked again if the server let them back in, so a refused rejoin left the page as it was. Now the chat is checked again after every answer, so someone who lost access is sent to the home page.

Fixes #32527

src/lib/components/chat/Chat.svelte

@@ -1464,8 +1464,9 @@
 		if (next && socket)
 			socket.emit('events:chat', { chat_id: next, data: { type: 'join' } }, (accepted: boolean) => {
 				if (!socket.connected || socket.id !== connectionId || $chatId !== next) return;
-				if (accepted) void refreshChat();
-				else clearPresence();
+				if (!accepted) clearPresence();
+				// A refused join can mean access was lost; the refresh then sends the reader home.
+				void refreshChat();
 			});
 	};
 	$: syncChatRoom($socket, $chatId, $temporaryChatEnabled);