dave: cleanly separate ui from logic

This is a good demo of how easy it is to build a notedeck app,
so let's detangle the ui from logic to showcase this

Signed-off-by: William Casarin <jb55@jb55.com>

crates/notedeck_dave/src/messages.rs

@@ -4,16 +4,16 @@ use nostrdb::{Ndb, Transaction};
 
 #[derive(Debug, Clone)]
 pub enum Message {
+    System(String),
     User(String),
     Assistant(String),
-    System(String),
     ToolCalls(Vec<ToolCall>),
     ToolResponse(ToolResponse),
 }
 
 /// The ai backends response. Since we are using streaming APIs these are
 /// represented as individual tokens or tool calls
-pub enum DaveResponse {
+pub enum DaveApiResponse {
     ToolCalls(Vec<ToolCall>),
     Token(String),
 }