feat: store chat_id to allow multiple chats, use enums in tauri

communication

frontend/src-tauri/src/commands.rs

@@ -72,7 +72,7 @@ pub async fn chat_history(
 ) -> Result<MessageHistory, String> {
     let mut client = state.grpc_client.lock().await;
     let result = client
-        .chat_history(ChatHistoryRequest { chat_id: None })
+        .chat_history(ChatHistoryRequest { chat_id: chat_id })
         .await;
     match result {
         Ok(response) => {