add key fix

src/apps/bridge-builder-math/App.tsx

@@ -46,6 +46,7 @@ const App: React.FC = () => {
   const [isTutorOpen, setIsTutorOpen] = useState(false);
   const [isMuted, setIsMuted] = useState(false);
   const [feedback, setFeedback] = useState<{ type: 'correct' | 'wrong', id: number } | null>(null);
+  const feedbackIdRef = useRef(0);
   
   // Responsive check for "Short Landscape" (Mobile Landscape)
   // We want side-by-side layout here because vertical space is scarce.
@@ -183,7 +184,8 @@ const App: React.FC = () => {
     if (answer === currentProblem.answer) {
       // Correct!
       audioService.playCorrect();
-      setFeedback({ type: 'correct', id: Date.now() });
+      feedbackIdRef.current += 1;
+      setFeedback({ type: 'correct', id: feedbackIdRef.current });
 
       setGameState(prev => {
         const newScore = prev.score + 10;
@@ -222,7 +224,8 @@ const App: React.FC = () => {
     } else {
       // Incorrect
       audioService.playIncorrect();
-      setFeedback({ type: 'wrong', id: Date.now() });
+      feedbackIdRef.current += 1;
+      setFeedback({ type: 'wrong', id: feedbackIdRef.current });
       setGameState(prev => ({ ...prev, streak: 0 }));
       // Visual feedback logic could go here (e.g. screen shake), handled by UI via streak reset
     }

src/apps/bridge-builder-math/components/ControlPanel.tsx

@@ -1,4 +1,4 @@
-import React, { useState, useEffect } from 'react';
+import React, { useState, useEffect, useCallback, useRef } from 'react';
 import { Problem, GameStatus } from '../types';
 import { Delete, ArrowRight } from 'lucide-react';
 
@@ -11,27 +11,130 @@ interface ControlPanelProps {
 
 export const ControlPanel: React.FC<ControlPanelProps> = ({ problem, status, onAnswer, forceVertical = false }) => {
   const [input, setInput] = useState('');
+  const lastKeyPressRef = useRef<{ key: string; time: number } | null>(null);
+  const processingRef = useRef(false);
+  const onAnswerRef = useRef(onAnswer);
+  const listenerIdRef = useRef(Math.random());
+  const lastClickRef = useRef<{ button: number; time: number } | null>(null);
+
+  // Keep onAnswer ref up to date
+  useEffect(() => {
+    onAnswerRef.current = onAnswer;
+  }, [onAnswer]);
 
   // Clear input when problem changes
   useEffect(() => {
     setInput('');
   }, [problem?.id]);
 
-  const handleNumClick = (num: number) => {
-    if (input.length < 3) { // Max 3 digits (answer < 200 usually)
-      setInput(prev => prev + num.toString());
+  const handleNumClick = useCallback((num: number) => {
+    const clickTime = Date.now();
+    const lastClick = lastClickRef.current;
+    
+    // Debounce: prevent clicks within 150ms
+    if (lastClick && lastClick.button === num && clickTime - lastClick.time < 150) {
+      console.log(`⛔ BLOCKED - too fast (${clickTime - lastClick.time}ms)`);
+      return;
+    }
+    
+    lastClickRef.current = { button: num, time: clickTime };
+    setInput(prev => {
+      if (prev.length < 3) {
+        return prev + num.toString();
+      }
+      return prev;
+    });
+  }, []);
+
+  const handleDelete = useCallback(() => {
+    setInput(prev => prev.slice(0, -1));
+  }, []);
+
+  const handleSubmit = useCallback((e?: React.FormEvent) => {
+    e?.preventDefault();
+    setInput(prev => {
+      if (prev !== '') {
+        onAnswerRef.current(parseInt(prev, 10));
+      }
+      return prev;
+    });
+  }, []);
+
+  // Keyboard event handler
+  useEffect(() => {
+    if (status !== GameStatus.PLAYING || !problem) return;
+
+    const handleKeyDown = (e: KeyboardEvent) => {
+      // Only handle if not repeating (key held down)
+      if (e.repeat) {
+        return;
+      }
+
+      // Prevent double processing
+      if (processingRef.current) {
+        e.preventDefault();
+        return;
+      }
+
+      // Strict debounce check
+      const now = Date.now();
+      const lastPress = lastKeyPressRef.current;
+
+      if (lastPress && lastPress.key === e.key && now - lastPress.time < 200) {
+        e.preventDefault();
+        return;
+      }
+
+      // Number keys (0-9)
+      if (e.key >= '0' && e.key <= '9') {
+        e.preventDefault();
+        processingRef.current = true;
+        lastKeyPressRef.current = { key: e.key, time: now };
+        
+        const num = parseInt(e.key, 10);
+        setInput(prev => {
+          if (prev.length < 3) {
+            return prev + num.toString();
+          }
+          return prev;
+        });
+        
+        setTimeout(() => { 
+          processingRef.current = false;
+        }, 50);
+      }
+      // Backspace/Delete
+      else if (e.key === 'Backspace' || e.key === 'Delete') {
+        e.preventDefault();
+        processingRef.current = true;
+        lastKeyPressRef.current = { key: e.key, time: now };
+        
+        setInput(prev => prev.slice(0, -1));
+        
+        setTimeout(() => { processingRef.current = false; }, 50);
+      }
+      // Enter
+      else if (e.key === 'Enter') {
+        e.preventDefault();
+        processingRef.current = true;
+        lastKeyPressRef.current = { key: e.key, time: now };
+        
+        setInput(prev => {
+          if (prev !== '') {
+            onAnswerRef.current(parseInt(prev, 10));
+          }
+          return prev;
+        });
+        
+        setTimeout(() => { processingRef.current = false; }, 50);
       }
     };
 
-  const handleDelete = () => {
-    setInput(prev => prev.slice(0, -1));
-  };
-
-  const handleSubmit = (e?: React.FormEvent) => {
-    e?.preventDefault();
-    if (input === '') return;
-    onAnswer(parseInt(input, 10));
+    window.addEventListener('keydown', handleKeyDown);
+    return () => {
+      window.removeEventListener('keydown', handleKeyDown);
     };
+  }, [status, problem]);
 
   if (status !== GameStatus.PLAYING || !problem) {
     return <div className="h-full bg-slate-100 rounded-t-xl animate-pulse"></div>;
@@ -61,21 +164,21 @@ export const ControlPanel: React.FC<ControlPanelProps> = ({ problem, status, onA
         <form onSubmit={handleSubmit} className="grid grid-cols-3 gap-2 h-full">
           {/* Row 1: 1, 2, 3 */}
           {[1, 2, 3].map((num) => (
-            <button key={num} type="button" onClick={() => handleNumClick(num)} className={btnClass}>
+            <button key={num} type="button" onPointerDown={(e) => { e.preventDefault(); handleNumClick(num); }} className={btnClass}>
               {num}
             </button>
           ))}
           
           {/* Row 2: 4, 5, 6 */}
           {[4, 5, 6].map((num) => (
-            <button key={num} type="button" onClick={() => handleNumClick(num)} className={btnClass}>
+            <button key={num} type="button" onPointerDown={(e) => { e.preventDefault(); handleNumClick(num); }} className={btnClass}>
               {num}
             </button>
           ))}
 
           {/* Row 3: 7, 8, 9 */}
           {[7, 8, 9].map((num) => (
-            <button key={num} type="button" onClick={() => handleNumClick(num)} className={btnClass}>
+            <button key={num} type="button" onPointerDown={(e) => { e.preventDefault(); handleNumClick(num); }} className={btnClass}>
               {num}
             </button>
           ))}
@@ -83,13 +186,13 @@ export const ControlPanel: React.FC<ControlPanelProps> = ({ problem, status, onA
           {/* Row 4: Del, 0, Enter */}
           <button
             type="button"
-            onClick={handleDelete}
+            onPointerDown={(e) => { e.preventDefault(); handleDelete(); }}
             className="bg-red-100 hover:bg-red-200 text-red-600 font-bold rounded-lg shadow-sm border-b-4 border-red-200 active:border-b-0 active:translate-y-1 transition-all h-full flex items-center justify-center touch-manipulation select-none"
           >
             <Delete />
           </button>
           
-          <button type="button" onClick={() => handleNumClick(0)} className={btnClass}>
+          <button type="button" onPointerDown={(e) => { e.preventDefault(); handleNumClick(0); }} className={btnClass}>
             0
           </button>
           

src/apps/bridge-builder-math/package-lock.json

@@ -51,6 +51,7 @@
       "integrity": "sha512-e7jT4DxYvIDLk1ZHmU/m/mB19rex9sv0c2ftBtjSBv+kVM/902eh0fINUzD7UwLLNR+jU585GxUJ8/EBfAM5fw==",
       "dev": true,
       "license": "MIT",
+      "peer": true,
       "dependencies": {
         "@babel/code-frame": "^7.27.1",
         "@babel/generator": "^7.28.5",
@@ -1215,6 +1216,7 @@
       "integrity": "sha512-LPM2G3Syo1GLzXLGJAKdqoU35XvrWzGJ21/7sgZTUpbkBaOasTj8tjwn6w+hCkqaa1TfJ/w67rJSwYItlJ2mYw==",
       "dev": true,
       "license": "MIT",
+      "peer": true,
       "dependencies": {
         "undici-types": "~6.21.0"
       }
@@ -1347,6 +1349,7 @@
         }
       ],
       "license": "MIT",
+      "peer": true,
       "dependencies": {
         "baseline-browser-mapping": "^2.9.0",
         "caniuse-lite": "^1.0.30001759",
@@ -1991,6 +1994,7 @@
       "integrity": "sha512-5gTmgEY/sqK6gFXLIsQNH19lWb4ebPDLA4SdLP7dsWkIXHWlG66oPuVvXSGFPppYZz8ZDZq0dYYrbHfBCVUb1Q==",
       "dev": true,
       "license": "MIT",
+      "peer": true,
       "engines": {
         "node": ">=12"
       },
@@ -2032,6 +2036,7 @@
       "resolved": "https://registry.npmjs.org/react/-/react-19.2.3.tgz",
       "integrity": "sha512-Ku/hhYbVjOQnXDZFv2+RibmLFGwFdeeKHFcOTlrt7xplBnya5OGn/hIRDsqDiSUcfORsDC7MPxwork8jBwsIWA==",
       "license": "MIT",
+      "peer": true,
       "engines": {
         "node": ">=0.10.0"
       }
@@ -2365,6 +2370,7 @@
       "integrity": "sha512-+Oxm7q9hDoLMyJOYfUYBuHQo+dkAloi33apOPP56pzj+vsdJDzr+j1NISE5pyaAuKL4A3UD34qd0lx5+kfKp2g==",
       "dev": true,
       "license": "MIT",
+      "peer": true,
       "dependencies": {
         "esbuild": "^0.25.0",
         "fdir": "^6.4.4",