Adds back in default conversation selector/create logic.

www/app/Chat.tsx

@@ -158,6 +158,28 @@ const { data: conversations, mutate: mutateConversations } = useSWR(
   {
     fallbackData: initialConversations,
     provider: localStorageProvider,
+    onSuccess: async (conversations) => {
+      if (conversations.length) {
+        // If there are existing conversations:
+        // 1. Set the current conversation to the first one if none is selected
+        // 2. Or if the selected conversation doesn't exist in the list
+        if (
+          !conversationId ||
+          !conversations.find((c) => c.conversationId === conversationId)
+        ) {
+          setConversationId(conversations[0].conversationId);
+        }
+        setCanSend(true);
+      } else {
+        // If no conversations exist:
+        // 1. Create a new conversation
+        // 2. Set it as the current conversation
+        // 3. Refresh the conversations list
+        const newConvo = await createConversation();
+        setConversationId(newConvo?.conversationId);
+        await mutateConversations();
+      }
+    },
     revalidateOnFocus: false,
     dedupingInterval: 60000,
     revalidateIfStale: false,