feat: Update AuthFlow logic and enhance ChatsListScreen with styled truncated public key display

app/src/main/java/com/rosetta/messenger/ui/auth/AuthFlow.kt

@@ -26,7 +26,6 @@ fun AuthFlow(
     var currentScreen by remember { 
         mutableStateOf(
             when {
-                hasExistingAccount && accounts.size > 1 -> AuthScreen.SELECT_ACCOUNT
                 hasExistingAccount -> AuthScreen.UNLOCK
                 else -> AuthScreen.WELCOME
             }

app/src/main/java/com/rosetta/messenger/ui/chats/ChatsListScreen.kt

@@ -386,12 +386,17 @@ fun ChatsListScreen(
                         
                         Spacer(modifier = Modifier.height(16.dp))
                         
-                        // Public key instead of account name
+                        // Public key - truncated and styled
+                        val truncatedKey = if (accountPublicKey.length > 12) {
+                            "${accountPublicKey.take(6)}...${accountPublicKey.takeLast(4)}"
+                        } else accountPublicKey
+                        
                         Text(
-                            text = accountPublicKey,
-                            fontSize = 14.sp,
-                            fontWeight = FontWeight.Medium,
+                            text = truncatedKey,
+                            fontSize = 13.sp,
+                            fontWeight = FontWeight.Normal,
                             color = secondaryTextColor,
+                            letterSpacing = 0.5.sp,
                             maxLines = 1
                         )
                     }
@@ -466,8 +471,7 @@ fun ChatsListScreen(
                     )
                 }
                 
-                Spacer(modifier = Modifier.navigationBarsPadding())
-                Spacer(modifier = Modifier.height(16.dp))
+                Spacer(modifier = Modifier.height(32.dp))
             }
         }
     ) {