Fixed DTLS Race Condition & Memory Safety

✅ FIXED HIGH CRITICALITY vulnerabilities (October 2024):
- DTLS ClientHello Race Condition: Added source validation
- Memory Safety Issues: Enhanced secure memory cleanup
- Added DTLS protection constants and validation methods
- Improved memory cleanup with secureWipe and zero-filling
- Integrated DTLS protection in handleSecureAnswer

src/components/ui/Header.jsx

@@ -497,7 +497,7 @@ const EnhancedMinimalHeader = ({
                         React.createElement('p', {
                             key: 'subtitle',
                             className: 'text-xs sm:text-sm text-muted hidden sm:block'
-                        }, 'End-to-end freedom. v4.01.413')
+                        }, 'End-to-end freedom. v4.01.441')
                     ])
                 ]),