Fix CameraEntropy video initialization and add stats review panel

- Fix videoRef timing issue by using useEffect for video setup
- Stop animation loop on capture to prevent infinite warnings
- Fix null canvas reference in generateMnemonicFromEntropy
- Add stats review panel with continue/retake options
- Add seed generation explanation and blurred preview
- Implement seed generation from camera noise/entropy bits and enhance dice rolls with detailed statistical analysis

src/components/Header.tsx

@@ -1,5 +1,5 @@
 import React from 'react';
-import { Shield, RefreshCw, Lock, Unlock } from 'lucide-react';
+import { Shield, RefreshCw } from 'lucide-react';
 import SecurityBadge from './badges/SecurityBadge';
 import StorageBadge from './badges/StorageBadge';
 import ClipboardBadge from './badges/ClipboardBadge';
@@ -28,7 +28,6 @@ interface HeaderProps {
   activeTab: 'create' | 'backup' | 'restore' | 'seedblender';
   onRequestTabChange: (tab: 'create' | 'backup' | 'restore' | 'seedblender') => void;
   encryptedMnemonicCache: any;
-  handleLockAndClear: () => void;
   appVersion: string;
   isLocked: boolean;
   onToggleLock: () => void;
@@ -45,7 +44,6 @@ const Header: React.FC<HeaderProps> = ({
   activeTab,
   onRequestTabChange,
   encryptedMnemonicCache,
-  handleLockAndClear,
   appVersion,
   isLocked,
   onToggleLock,