feat(tui): single ctrl+c clears input, double ctrl+c exits

src/frontends/tui/components/App.tsx

@@ -77,6 +77,7 @@ export function App({
   onTransfer,
   onExit,
 }: AppProps): React.ReactElement {
+  const ctrlCExitWindowMs = 1_500;
   const { exit } = useApp();
   const [input, setInput] = useState('');
   const [messages, setMessages] = useState<Message[]>(session.getHistory());
@@ -91,6 +92,7 @@ export function App({
   });
 
   const abortRef = useRef(false);
+  const lastCtrlCAtRef = useRef(0);
   const toolLinesRef = useRef<string[]>([]);
 
   const confirmResolveRef = useRef<((result: HookResult) => void) | null>(null);
@@ -177,6 +179,21 @@ export function App({
       return;
     }
 
+    if (key.ctrl && inputChar.toLowerCase() === 'c') {
+      const now = Date.now();
+      const shouldExit = lastCtrlCAtRef.current > 0 && (now - lastCtrlCAtRef.current) <= ctrlCExitWindowMs;
+      lastCtrlCAtRef.current = now;
+      if (shouldExit) {
+        onExit?.();
+        exit();
+        return;
+      }
+      if (input.length > 0) {
+        setInput('');
+      }
+      return;
+    }
+
     // Tab completion for slash commands
     if (key.tab && !isStreaming) {
       const completions = getCommandCompletions(input);