feat(cli): support single Ctrl+C to cancel streaming, preserving double Ctrl+C to exit (#5838)

packages/cli/src/ui/App.tsx

@@ -545,6 +545,7 @@ const App = ({ config, settings, startupWarnings = [], version }: AppProps) => {
     initError,
     pendingHistoryItems: pendingGeminiHistoryItems,
     thought,
+    cancelOngoingRequest,
   } = useGeminiStream(
     config.getGeminiClient(),
     history,
@@ -655,6 +656,9 @@ const App = ({ config, settings, startupWarnings = [], version }: AppProps) => {
         if (isAuthenticating) {
           return;
         }
+        if (!ctrlCPressedOnce) {
+          cancelOngoingRequest?.();
+        }
         handleExit(ctrlCPressedOnce, setCtrlCPressedOnce, ctrlCTimerRef);
       } else if (keyMatchers[Command.EXIT](key)) {
         if (buffer.text.length > 0) {
@@ -686,6 +690,7 @@ const App = ({ config, settings, startupWarnings = [], version }: AppProps) => {
       ctrlDTimerRef,
       handleSlashCommand,
       isAuthenticating,
+      cancelOngoingRequest,
     ],
   );