feat: Tambah Ctrl+Y untuk menyalin pesan assistant terakhir

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

src/controller/input.rs

@@ -132,6 +132,23 @@ pub fn handle_key(key: KeyEvent, state: &mut AppStateRest) -> Vec<Action> {
         KeyCode::Char('d') if key.modifiers.contains(KeyModifiers::CONTROL) => {
             vec![Action::CloseOverlay]
         }
+        KeyCode::Char('y') if key.modifiers.contains(KeyModifiers::CONTROL) => {
+            let last_assistant = state.transcript_cache.messages.iter()
+                .rev()
+                .find(|m| m.role == crate::dto::chat::message::Role::Assistant);
+            match last_assistant {
+                Some(msg) => {
+                    state.misc.pending_clipboard_copy = Some(msg.content.clone());
+                }
+                None => {
+                    state.push_toast(crate::app::state::types::Toast::new(
+                        crate::app::state::types::ToastKind::Info,
+                        "No assistant message to copy yet".to_string(),
+                    ));
+                }
+            }
+            Vec::new()
+        }
         KeyCode::Enter => {
             if state.input.autocomplete_visible {
                 state.input.select_autocomplete();
@@ -371,3 +388,45 @@ fn handle_overlay_enter(state: &mut AppStateRest) -> Vec<Action> {
         _ => Vec::new(),
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    fn test_state() -> AppStateRest {
+        let tmp = std::env::temp_dir().join(format!("zesdex-input-test-{}", uuid::Uuid::new_v4()));
+        std::fs::create_dir_all(&tmp).unwrap();
+        AppStateRest::new(vec![tmp.clone()], &tmp, tmp.join("memory"))
+    }
+
+    #[test]
+    fn ctrl_y_sets_pending_clipboard_copy_to_last_assistant_message() {
+        let mut state = test_state();
+        state.push_transcript(crate::app::state::rest::ChatMessageDisplay::new(
+            crate::dto::chat::message::Role::User,
+            "hi".to_string(),
+        ));
+        state.push_transcript(crate::app::state::rest::ChatMessageDisplay::new(
+            crate::dto::chat::message::Role::Assistant,
+            "first reply".to_string(),
+        ));
+        state.push_transcript(crate::app::state::rest::ChatMessageDisplay::new(
+            crate::dto::chat::message::Role::Tool,
+            "tool output".to_string(),
+        ));
+        state.push_transcript(crate::app::state::rest::ChatMessageDisplay::new(
+            crate::dto::chat::message::Role::Assistant,
+            "second reply".to_string(),
+        ));
+        handle_key(KeyEvent::new(KeyCode::Char('y'), KeyModifiers::CONTROL), &mut state);
+        assert_eq!(state.misc.pending_clipboard_copy, Some("second reply".to_string()));
+    }
+
+    #[test]
+    fn ctrl_y_with_no_assistant_message_pushes_info_toast() {
+        let mut state = test_state();
+        handle_key(KeyEvent::new(KeyCode::Char('y'), KeyModifiers::CONTROL), &mut state);
+        assert!(state.misc.pending_clipboard_copy.is_none());
+        assert_eq!(state.misc.toasts.len(), 1);
+    }
+}