fix: improve quit confirmation UX with cancel option

- Add CANCEL option to QuitChoice enum
- Move cancel option to bottom of dialog (UI best practice)
- Fix escape key behavior to cancel instead of quit
- Update quit confirmation logic to handle cancellation
- Enable true two-step confirmation for Ctrl+C/Ctrl+D

packages/cli/src/ui/components/QuitConfirmationDialog.tsx

@@ -14,6 +14,7 @@ import {
 import { useKeypress } from '../hooks/useKeypress.js';
 
 export enum QuitChoice {
+  CANCEL = 'cancel',
   QUIT = 'quit',
   SAVE_AND_QUIT = 'save_and_quit',
   SUMMARY_AND_QUIT = 'summary_and_quit',
@@ -29,7 +30,7 @@ export const QuitConfirmationDialog: React.FC<QuitConfirmationDialogProps> = ({
   useKeypress(
     (key) => {
       if (key.name === 'escape') {
-        onSelect(QuitChoice.QUIT);
+        onSelect(QuitChoice.CANCEL);
       }
     },
     { isActive: true },
@@ -48,6 +49,10 @@ export const QuitConfirmationDialog: React.FC<QuitConfirmationDialogProps> = ({
       label: 'Save conversation and quit (/chat save)',
       value: QuitChoice.SAVE_AND_QUIT,
     },
+    {
+      label: 'Cancel (stay in application)',
+      value: QuitChoice.CANCEL,
+    },
   ];
 
   return (

packages/cli/src/ui/hooks/slashCommandProcessor.ts

@@ -419,6 +419,10 @@ export const useSlashCommandProcessor = (
                   setQuitConfirmationRequest({
                     onConfirm: (shouldQuit: boolean, action?: string) => {
                       setQuitConfirmationRequest(null);
+                      if (!shouldQuit) {
+                        // User cancelled the quit operation - do nothing
+                        return;
+                      }
                       if (shouldQuit) {
                         if (action === 'save_and_quit') {
                           // First save conversation with auto-generated tag, then quit

packages/cli/src/ui/hooks/useQuitConfirmation.ts

@@ -17,7 +17,9 @@ export const useQuitConfirmation = () => {
   const handleQuitConfirmationSelect = useCallback((choice: QuitChoice) => {
     setIsQuitConfirmationOpen(false);
 
-    if (choice === QuitChoice.QUIT) {
+    if (choice === QuitChoice.CANCEL) {
+      return { shouldQuit: false, action: 'cancel' };
+    } else if (choice === QuitChoice.QUIT) {
       return { shouldQuit: true, action: 'quit' };
     } else if (choice === QuitChoice.SAVE_AND_QUIT) {
       return { shouldQuit: true, action: 'save_and_quit' };
@@ -25,8 +27,8 @@ export const useQuitConfirmation = () => {
       return { shouldQuit: true, action: 'summary_and_quit' };
     }
 
-    // Default to quit if unknown choice
-    return { shouldQuit: true, action: 'quit' };
+    // Default to cancel if unknown choice
+    return { shouldQuit: false, action: 'cancel' };
   }, []);
 
   return {