docs: Update README to v4.7.53 with Desktop Edition and roadmap updates

- Update version to v4.7.53
- Add Desktop Edition documentation (Windows, macOS, Linux)
- Update roadmap with all versions and dates
- Add mobile apps information (Q1 2026)
- Expand security and development sections
- Update URLs to securebit.chat domain

src/app.jsx

@@ -224,7 +224,7 @@
                             }, [
                                 React.createElement('div', {
                                     key: 'message',
-                                    className: "text-sm"
+                                    className: "text-sm break-words whitespace-normal"
                                 }, message),
                                 timestamp && React.createElement('div', {
                                     key: 'meta',
@@ -1924,7 +1924,7 @@
                             }
                         }
         
-                        handleMessage(' SecureBit.chat Enhanced Security Edition v4.5.22 - ECDH + DTLS + SAS initialized. Ready to establish a secure connection with ECDH key exchange, DTLS fingerprint verification, and SAS authentication to prevent MITM attacks.', 'system');
+                        handleMessage(' SecureBit.chat Enhanced Security Edition v4.7.53 - ECDH + DTLS + SAS initialized. Ready to establish a secure connection with ECDH key exchange, DTLS fingerprint verification, and SAS authentication to prevent MITM attacks.', 'system');
         
                         const handleBeforeUnload = (event) => {
                             if (event.type === 'beforeunload' && !isTabSwitching) {