Add end-to-end encrypted voice messages; release v5.4.5

- Record voice notes in-browser, sent over the chunked AES-GCM file-transfer
  channel (per-file session key + signed SHA-256 integrity).
- Captured as PCM and encoded to WAV for universal playback (incl. iOS/Safari);
  auto-accepted and played inline from an in-memory blob, never written to disk.
- Composer mic button with live waveform + timer; desktop shows mic + send side
  by side, mobile swaps mic to send when typing.
- CSP media-src now allows blob: so recorded/received audio can play.
- Roadmap: Desktop Edition -> 5.0, new 5.5 'Secure Voice & Calls', later
  milestones shifted; version bumped to 5.4.5.
- Update README, docs (security/API/cryptography), and CHANGELOG.

src/components/ui/Header.jsx

@@ -559,7 +559,7 @@ const EnhancedMinimalHeader = ({
                     React.createElement('div', { key: 'txt', style: { lineHeight: 1.2, minWidth: 0 } }, [
                         React.createElement('div', { key: 'r1', style: { display: 'flex', alignItems: 'baseline', gap: '7px' } }, [
                             React.createElement('span', { key: 'n', style: { fontSize: '16px', fontWeight: 800, letterSpacing: '-0.3px', color: '#e8e8eb' } }, 'SecureBit'),
-                            React.createElement('span', { key: 'v', style: { fontFamily: MONO, fontSize: '10px', fontWeight: 500, color: '#56565e' } }, 'v4.9.1')
+                            React.createElement('span', { key: 'v', style: { fontFamily: MONO, fontSize: '10px', fontWeight: 500, color: '#56565e' } }, 'v5.4.5')
                         ]),
                         React.createElement('div', { key: 'r2', className: 'hidden sm:block', style: { fontSize: '11px', color: '#6b6b73', fontWeight: 500 } }, 'End-to-end encrypted')
                     ])

src/components/ui/Roadmap.jsx

@@ -31,17 +31,19 @@ function Roadmap() {
           features: ["Metadata protection and fingerprint reduction", "Experiments with onion routing and DHT", "Options for anonymous connections", "Preparation for open code audit", "Improved user verification processes"] },
         { v: "v4.5", title: "Enhanced Security Edition", sub: "18-layer military-grade cryptography with complete ASN.1 validation", status: "released", date: "Late 2025",
           features: ["ECDH + DTLS + SAS triple-layer security", "ECDH P-384 + AES-GCM 256-bit encryption", "DTLS fingerprint verification", "SAS (Short Authentication String) verification", "Perfect Forward Secrecy with key rotation", "Enhanced MITM attack prevention", "Complete ASN.1 DER validation", "OID and EC point verification", "SPKI structure validation", "P2P WebRTC architecture", "Metadata protection", "100% open source code"] },
-        { v: "v4.7", title: "Desktop Edition", sub: "Native desktop apps for Windows, macOS, and Linux", status: "current", date: "Now",
+        { v: "v5.0", title: "Desktop Edition", sub: "Native desktop apps for Windows, macOS, and Linux", status: "released", date: "Early 2026",
           features: ["Windows desktop app (Tauri v2)", "macOS desktop app (Tauri v2)", "Linux AppImage support (Tauri v2)", "Real-time notifications", "Automatic reconnection", "Cross-device synchronization", "Improved UX/UI", "Support for files up to 100MB"] },
-        { v: "v5.0", title: "Mobile Edition", sub: "Native mobile apps for iOS and Android", status: "dev", date: "Q1 2026",
+        { v: "v5.5", title: "Secure Voice & Calls", sub: "Encrypted voice messages, audio calls, and video calls", status: "current", date: "Now",
+          features: ["End-to-end encrypted voice messages", "1:1 encrypted audio calls (WebRTC)", "1:1 encrypted video calls (WebRTC)", "Perfect Forward Secrecy for live media", "SRTP/DTLS-protected media streams", "In-call SAS verification", "Call notifications and auto-reconnection", "Low-latency P2P media"] },
+        { v: "v6.0", title: "Mobile Edition", sub: "Native mobile apps for iOS and Android", status: "dev", date: "Q4 2026",
           features: ["iOS native app (Swift/SwiftUI)", "Android native app (Kotlin/Jetpack Compose)", "PWA support for mobile browsers", "Real-time push notifications", "Battery optimization", "Mobile-optimized UX/UI", "Offline message queuing", "Biometric authentication"] },
-        { v: "v5.5", title: "Quantum-Resistant Edition", sub: "Protection against quantum computers", status: "planned", date: "Q2 2026",
-          features: ["Post-quantum cryptography CRYSTALS-Kyber", "SPHINCS+ digital signatures", "Hybrid scheme: classic + PQ", "Quantum-safe key exchange", "Updated hashing algorithms", "Migration of existing sessions", "Compatibility with v4.x", "Quantum-resistant protocols"] },
-        { v: "v6.0", title: "Group Communications", sub: "Group chats with preserved privacy", status: "planned", date: "Q4 2026",
+        { v: "v6.5", title: "Quantum-Resistant Edition", sub: "Protection against quantum computers", status: "planned", date: "Q2 2027",
+          features: ["Post-quantum cryptography CRYSTALS-Kyber", "SPHINCS+ digital signatures", "Hybrid scheme: classic + PQ", "Quantum-safe key exchange", "Updated hashing algorithms", "Migration of existing sessions", "Compatibility with v5.x", "Quantum-resistant protocols"] },
+        { v: "v7.0", title: "Group Communications", sub: "Group chats with preserved privacy", status: "planned", date: "Q4 2027",
           features: ["P2P group connections up to 8 participants", "Mesh networking for groups", "Signal Double Ratchet for groups", "Anonymous groups without metadata", "Ephemeral groups (disappear after session)", "Cryptographic group administration", "Group member auditing"] },
-        { v: "v6.5", title: "Decentralized Network", sub: "Fully decentralized network", status: "research", date: "2027",
+        { v: "v7.5", title: "Decentralized Network", sub: "Fully decentralized network", status: "research", date: "2028",
           features: ["Node mesh network", "DHT for peer discovery", "Built-in onion routing", "Tokenomics and node incentives", "Governance via DAO", "Interoperability with other networks", "Cross-platform compatibility", "Self-healing network"] },
-        { v: "v7.0", title: "AI Privacy Assistant", sub: "AI for privacy and security", status: "research", date: "2028+",
+        { v: "v8.0", title: "AI Privacy Assistant", sub: "AI for privacy and security", status: "research", date: "2028+",
           features: ["Local AI threat analysis", "Automatic MITM detection", "Adaptive cryptography", "Personalized security recommendations", "Zero-knowledge machine learning", "Private AI assistant", "Predictive security", "Autonomous attack protection"] }
     ];