refactor: build the app with Application::create

Application::new(qh, sender) took the session's Wayland queue handle,
which no client ever used, and calloop's sender; cce-ui is retiring it
for create(sender: AppSender<_>), which names no window system. The
body is unchanged: an app that keeps calloop's sender converts the
AppSender into it on the first line, and the now-unused QueueHandle and
EngineState imports go.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

 src/main.rs | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/src/main.rs b/src/main.rs
index 77e2fb4..3cbefb0 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,7 +1,6 @@
-use wayland_client::QueueHandle;
 use cce_ui::widget::Owned;
 use cce_ui::cosmic_text::FontSystem;
-use cce_ui::engine::{Application, EngineState, LogicalPosition, LogicalSize, WindowSettings};
+use cce_ui::engine::{Application, LogicalPosition, LogicalSize, WindowSettings};
 use cce_ui::widget::{
     MouseButton, ElementState, MouseScrollDelta, KeyEvent, WidgetHost,
     TextBox, Key, Dropdown
@@ -212,7 +211,7 @@ impl Application for TextEditorApp {
         Some(&mut self.ui_context)
     }
 
-    fn new(_qh: &QueueHandle<EngineState<Self>>, _sender: calloop::channel::Sender<Self::Message>) -> Self {
+    fn create(_sender: cce_ui::engine::AppSender<Self::Message>) -> Self {
         let dropdown_options = vec![
             "New".to_string(),
             "Open...".to_string(),