Add simple camera test component for debugging

🔬 Camera Debug Test:
- Create minimal camera component to isolate UI issues
- Always shows video element (no conditional rendering)
- Detailed status and error reporting
- Shows video properties and ready state
- Tests basic camera stream assignment and playback

This will help determine if the issue is:
❓ Video element not rendering at all
❓ Stream not being assigned properly
❓ CSS/styling hiding the video
❓ Video element exists but shows black screen

src/components/SimpleCameraTest.tsx

@@ -0,0 +1,110 @@
+import React, { useState, useRef } from 'react';
+
+const SimpleCameraTest: React.FC = () => {
+  const [stream, setStream] = useState<MediaStream | null>(null);
+  const [error, setError] = useState<string>('');
+  const [status, setStatus] = useState<string>('Not started');
+  const videoRef = useRef<HTMLVideoElement>(null);
+
+  const startCamera = async () => {
+    setStatus('🔄 Starting camera...');
+    setError('');
+    
+    try {
+      const mediaStream = await navigator.mediaDevices.getUserMedia({
+        video: { facingMode: 'environment' }
+      });
+      
+      setStatus('✅ Camera stream obtained');
+      setStream(mediaStream);
+      
+      if (videoRef.current) {
+        videoRef.current.srcObject = mediaStream;
+        setStatus('✅ Stream assigned to video element');
+        
+        // Force play
+        videoRef.current.play().then(() => {
+          setStatus('✅ Video playing successfully');
+        }).catch((err) => {
+          setError(`Play error: ${err.message}`);
+          setStatus('❌ Video play failed');
+        });
+      } else {
+        setError('Video ref is null');
+        setStatus('❌ No video element');
+      }
+    } catch (err: any) {
+      setError(`Camera error: ${err.message}`);
+      setStatus('❌ Camera failed');
+    }
+  };
+
+  const stopCamera = () => {
+    if (stream) {
+      stream.getTracks().forEach(track => track.stop());
+      setStream(null);
+    }
+    setStatus('Camera stopped');
+    setError('');
+  };
+
+  return (
+    <div className="p-4 border border-gray-300 rounded-lg">
+      <h3 className="font-bold mb-4">🔬 Simple Camera Test</h3>
+      
+      <div className="space-y-4">
+        <div className="flex gap-2">
+          <button
+            onClick={startCamera}
+            className="bg-green-600 text-white px-4 py-2 rounded"
+            disabled={!!stream}
+          >
+            Start Camera
+          </button>
+          <button
+            onClick={stopCamera}
+            className="bg-red-600 text-white px-4 py-2 rounded"
+            disabled={!stream}
+          >
+            Stop Camera
+          </button>
+        </div>
+
+        <div className="text-sm">
+          <div><strong>Status:</strong> {status}</div>
+          {error && <div className="text-red-600"><strong>Error:</strong> {error}</div>}
+          <div><strong>Stream:</strong> {stream ? '✅ Active' : '❌ None'}</div>
+          <div><strong>Video Ref:</strong> {videoRef.current ? '✅ Exists' : '❌ Null'}</div>
+        </div>
+
+        {/* Always show video element */}
+        <div className="bg-black rounded-lg overflow-hidden">
+          <video
+            ref={videoRef}
+            autoPlay
+            playsInline
+            muted
+            className="w-full h-auto max-h-64 object-cover"
+            style={{ minHeight: '200px' }}
+          />
+        </div>
+
+        {/* Debug info */}
+        <div className="text-xs bg-gray-100 p-2 rounded">
+          <div>Video element exists: {videoRef.current ? 'Yes' : 'No'}</div>
+          {videoRef.current && (
+            <>
+              <div>Video width: {videoRef.current.videoWidth}</div>
+              <div>Video height: {videoRef.current.videoHeight}</div>
+              <div>Ready state: {videoRef.current.readyState}</div>
+              <div>Paused: {videoRef.current.paused ? 'Yes' : 'No'}</div>
+              <div>Muted: {videoRef.current.muted ? 'Yes' : 'No'}</div>
+            </>
+          )}
+        </div>
+      </div>
+    </div>
+  );
+};
+
+export default SimpleCameraTest; 

src/pages/Scanner.tsx

@@ -3,6 +3,7 @@ import CameraScanner from '../components/CameraScanner';
 import GlowingCard from '../components/GlowingCard';
 import CardImageDisplay from '../components/CardImageDisplay';
 import DebugInfo from '../components/DebugInfo';
+import SimpleCameraTest from '../components/SimpleCameraTest';
 import { cardMatcher } from '../services/cardMatcher';
 import { useAuth } from '../contexts/AuthContext';
 
@@ -279,6 +280,9 @@ const Scanner: React.FC = () => {
       {/* Debug Information */}
       <DebugInfo />
       
+      {/* Simple Camera Test */}
+      <SimpleCameraTest />
+
       {/* Error Display */}
       {error && (
         <div className="mb-6 bg-red-50 border border-red-200 rounded-lg p-4">