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/SeedBlender.tsx

@@ -5,7 +5,7 @@
  * handling various input formats, per-row decryption, and final output actions.
  */
 import { useState, useEffect, useCallback, useRef } from 'react';
-import { QrCode, X, Plus, CheckCircle2, AlertTriangle, RefreshCw, Sparkles, EyeOff, Lock, Key, ArrowRight } from 'lucide-react';
+import { QrCode, X, Plus, CheckCircle2, AlertTriangle, RefreshCw, Sparkles, EyeOff, Key, ArrowRight } from 'lucide-react';
 import QRScanner from './QRScanner';
 import { decryptFromSeed, detectEncryptionMode } from '../lib/seedpgp';
 import { decryptFromKrux } from '../lib/krux';
@@ -113,19 +113,6 @@ export function SeedBlender({ onDirtyStateChange, setMnemonicForBackup, requestT
         }
     }, [incomingSeed]);
 
-    const handleLockAndClear = () => {
-        setEntries([createNewEntry()]);
-        setBlendedResult(null);
-        setXorStrength(null);
-        setBlendError('');
-        setDiceRolls('');
-        setDiceStats(null);
-        setDicePatternWarning(null);
-        setDiceOnlyMnemonic(null);
-        setFinalMnemonic(null);
-        setShowFinalQR(false);
-    };
-
     useEffect(() => {
         const processEntries = async () => {
             setBlending(true);