feat: Add chats list, account selection, fix paste, redesign confirm screen

- Fix paste all 12 words logic in ImportSeedPhraseScreen
- Redesign ConfirmSeedPhraseScreen with two-column layout and colorful words
- Add ChatsListScreen with beautiful animations and demo chats
- Add SelectAccountScreen with account grid and create/import modal
- Update AuthFlow to support multiple accounts and account switching
- Add Switch Account button in UnlockScreen
- Update MainActivity with new screens integration

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

@@ -236,9 +236,10 @@ private fun SavedMessagesItem(
         }
     }
     
-    HorizontalDivider(
+    Divider(
         modifier = Modifier.padding(start = 84.dp),
-        color = if (isDarkTheme) Color(0xFF3A3A3A) else Color(0xFFE8E8E8)
+        color = if (isDarkTheme) Color(0xFF3A3A3A) else Color(0xFFE8E8E8),
+        thickness = 0.5.dp
     )
 }
 
@@ -353,9 +354,10 @@ private fun ChatItem(
         }
     }
     
-    HorizontalDivider(
+    Divider(
         modifier = Modifier.padding(start = 84.dp),
-        color = if (isDarkTheme) Color(0xFF3A3A3A) else Color(0xFFE8E8E8)
+        color = if (isDarkTheme) Color(0xFF3A3A3A) else Color(0xFFE8E8E8),
+        thickness = 0.5.dp
     )
 }
 

app/src/main/java/com/rosetta/messenger/ui/onboarding/OnboardingScreen.kt

@@ -426,14 +426,6 @@ fun AnimatedRosettaLogo(
                         .clip(CircleShape)
                 )
             }
-                    painter = painterResource(id = R.drawable.rosetta_icon),
-                    contentDescription = "Rosetta Logo",
-                    modifier = Modifier
-                        .fillMaxSize()
-                        .scale(pulseScale)
-                        .clip(CircleShape)
-                )
-            }
             
             // Fast page - idea animation (page 1)
             ideaComposition?.let { comp ->