chore: Improve Chat Performance (#35)

* refactor

* optimistically update message list

* fix

* update

* handle duplicate messages

* update ui

* refactor input

* update multi line input

* clean up

crates/ui/src/actions.rs

@@ -0,0 +1,11 @@
+use gpui::{actions, impl_internal_actions};
+use serde::Deserialize;
+
+#[derive(Clone, PartialEq, Eq, Deserialize)]
+pub struct Confirm {
+    /// Is confirm with secondary.
+    pub secondary: bool,
+}
+
+actions!(list, [Cancel, SelectPrev, SelectNext]);
+impl_internal_actions!(list, [Confirm]);