Add App core struct with event-handling and initialization logic for TUI.

crates/owlen-tui/src/code_app.rs

@@ -0,0 +1,43 @@
+use anyhow::Result;
+use owlen_core::session::SessionController;
+use tokio::sync::mpsc;
+
+use crate::chat_app::{AppState, ChatApp, InputMode, SessionEvent};
+use crate::events::Event;
+
+const DEFAULT_SYSTEM_PROMPT: &str =
+    "You are OWLEN Code Assistant. Provide detailed, actionable programming help.";
+
+pub struct CodeApp {
+    inner: ChatApp,
+}
+
+impl CodeApp {
+    pub fn new(mut controller: SessionController) -> (Self, mpsc::UnboundedReceiver<SessionEvent>) {
+        controller
+            .conversation_mut()
+            .push_system_message(DEFAULT_SYSTEM_PROMPT.to_string());
+        let (inner, rx) = ChatApp::new(controller);
+        (Self { inner }, rx)
+    }
+
+    pub async fn handle_event(&mut self, event: Event) -> Result<AppState> {
+        self.inner.handle_event(event).await
+    }
+
+    pub fn handle_session_event(&mut self, event: SessionEvent) -> Result<()> {
+        self.inner.handle_session_event(event)
+    }
+
+    pub fn mode(&self) -> InputMode {
+        self.inner.mode()
+    }
+
+    pub fn inner(&self) -> &ChatApp {
+        &self.inner
+    }
+
+    pub fn inner_mut(&mut self) -> &mut ChatApp {
+        &mut self.inner
+    }
+}