Fixed message loading

Root messages weren't being loaded since the refactor, and there was
dead code

pkg/tui/views/chat/chat.go

@@ -16,11 +16,6 @@ import (
 
 // custom tea.Msg types
 type (
-	// sent when a conversation is (re)loaded
-	msgConversationLoaded struct {
-		conversation *api.Conversation
-		rootMessages []api.Message
-	}
 	// sent when a new conversation title generated
 	msgConversationTitleGenerated string
 	// sent when the conversation has been persisted, triggers a reload of contents
@@ -30,7 +25,10 @@ type (
 		messages     []api.Message
 	}
 	// sent when a conversation's messages are laoded
-	msgMessagesLoaded []api.Message
+	msgConversationMessagesLoaded struct {
+		messages []api.Message
+		rootMessages []api.Message
+	}
 	// a special case of common.MsgError that stops the response waiting animation
 	msgChatResponseError error
 	// sent on each chunk received from LLM