fix: improve bash-mode backspace exit behavior (#1386)

Co-authored-by: Letta Code <noreply@letta.com>

src/cli/components/InputRich.tsx

@@ -803,6 +803,7 @@ export function Input({
 
   // Bash mode state (declared early so prompt width can feed into contentWidth)
   const [isBashMode, setIsBashMode] = useState(false);
+  const [bashExitArmed, setBashExitArmed] = useState(false);
 
   useEffect(() => {
     const prev = lastColumnsRef.current;
@@ -926,14 +927,21 @@ export function Input({
   const handleBangAtEmpty = useCallback(() => {
     if (isBashMode) return false;
     setIsBashMode(true);
+    // Arm immediately so initial empty backspace exits in one press.
+    setBashExitArmed(true);
     return true;
   }, [isBashMode]);
 
   const handleBackspaceAtEmpty = useCallback(() => {
     if (!isBashMode) return false;
+    if (!bashExitArmed) {
+      setBashExitArmed(true);
+      return true;
+    }
     setIsBashMode(false);
+    setBashExitArmed(false);
     return true;
-  }, [isBashMode]);
+  }, [isBashMode, bashExitArmed]);
 
   // Reset cursor position after it's been applied
   useEffect(() => {
@@ -943,6 +951,20 @@ export function Input({
     }
   }, [cursorPos]);
 
+  // Reset bash exit arming when leaving bash mode
+  useEffect(() => {
+    if (!isBashMode && bashExitArmed) {
+      setBashExitArmed(false);
+    }
+  }, [isBashMode, bashExitArmed]);
+
+  // If user types after first backspace-at-empty, disarm exit intent
+  useEffect(() => {
+    if (bashExitArmed && value.length > 0) {
+      setBashExitArmed(false);
+    }
+  }, [value, bashExitArmed]);
+
   // Reset boundary flags and preferred column when cursor moves or value changes
   useEffect(() => {
     if (currentCursorPosition !== 0) {
@@ -1057,6 +1079,7 @@ export function Input({
         // First CTRL-C - wipe input and start 1-second timer
         // Note: In bash mode, this clears input but keeps bash mode active
         setValue("");
+        setBashExitArmed(false);
         setCtrlCPressed(true);
         if (ctrlCTimerRef.current) clearTimeout(ctrlCTimerRef.current);
         ctrlCTimerRef.current = setTimeout(() => {