UI: унифицированы иконки навигации (ChevronLeft), фикс обрезки эмодзи в reply-превью, проверка доступности username при регистрации, отдельный экран биометрии, клавиатура прячется при скролле профиля и навигации, плавная анимация navbar при смене темы, аватарки в поиске.

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

@@ -10,6 +10,8 @@ import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.foundation.text.BasicTextField
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.filled.*
+import compose.icons.TablerIcons
+import compose.icons.tablericons.*
 import androidx.compose.material3.*
 import androidx.compose.runtime.*
 import androidx.compose.ui.Alignment
@@ -144,7 +146,7 @@ fun ConfirmSeedPhraseScreen(
                 verticalAlignment = Alignment.CenterVertically
             ) {
                 IconButton(onClick = onBack) {
-                    Icon(Icons.Default.ArrowBack, "Back", tint = textColor)
+                    Icon(TablerIcons.ChevronLeft, "Back", tint = textColor)
                 }
             }
             

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

@@ -8,6 +8,8 @@ import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.foundation.text.BasicTextField
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.filled.*
+import compose.icons.TablerIcons
+import compose.icons.tablericons.*
 import androidx.compose.material3.*
 import androidx.compose.runtime.*
 import androidx.compose.ui.Alignment
@@ -64,7 +66,7 @@ fun ImportSeedPhraseScreen(
                 verticalAlignment = Alignment.CenterVertically
             ) {
                 IconButton(onClick = onBack) {
-                    Icon(Icons.Default.ArrowBack, "Back", tint = textColor)
+                    Icon(TablerIcons.ChevronLeft, "Back", tint = textColor)
                 }
             }
             

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

@@ -7,6 +7,8 @@ import androidx.compose.foundation.layout.*
 import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.filled.*
+import compose.icons.TablerIcons
+import compose.icons.tablericons.*
 import androidx.compose.material3.*
 import androidx.compose.runtime.*
 import androidx.compose.ui.Alignment
@@ -65,7 +67,7 @@ fun SeedPhraseScreen(
                 verticalAlignment = Alignment.CenterVertically
             ) {
                 IconButton(onClick = onBack) {
-                    Icon(Icons.Default.ArrowBack, "Back", tint = textColor)
+                    Icon(TablerIcons.ChevronLeft, "Back", tint = textColor)
                 }
             }
             

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

@@ -11,6 +11,8 @@ import androidx.compose.foundation.layout.*
 import androidx.compose.foundation.shape.CircleShape
 import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.material3.*
+import compose.icons.TablerIcons
+import compose.icons.tablericons.*
 import androidx.compose.runtime.*
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
@@ -84,9 +86,40 @@ fun SetProfileScreen(
     var isSaving by remember { mutableStateOf(false) }
     var visible by remember { mutableStateOf(false) }
 
+    // Username availability check
+    var usernameAvailable by remember { mutableStateOf<Boolean?>(null) }
+    var isCheckingUsername by remember { mutableStateOf(false) }
+
+    LaunchedEffect(username) {
+        val trimmed = username.trim()
+        if (trimmed.length < USERNAME_MIN_LENGTH) {
+            usernameAvailable = null
+            return@LaunchedEffect
+        }
+        if (validateUsername(trimmed) != null) {
+            usernameAvailable = null
+            return@LaunchedEffect
+        }
+        usernameAvailable = null
+        isCheckingUsername = true
+        delay(600) // debounce
+        try {
+            val results = ProtocolManager.searchUsers(trimmed, 3000)
+            val taken = results.any { it.username.equals(trimmed, ignoreCase = true) }
+            usernameAvailable = !taken
+        } catch (_: Exception) {
+            usernameAvailable = null
+        }
+        isCheckingUsername = false
+    }
+
     val nameError = if (nameTouched) validateName(name.trim()) else null
-    val usernameError = if (usernameTouched) validateUsername(username.trim()) else null
+    val localUsernameError = if (usernameTouched) validateUsername(username.trim()) else null
-    val isFormValid = validateName(name.trim()) == null && validateUsername(username.trim()) == null
+    val usernameError = localUsernameError
+        ?: if (usernameTouched && usernameAvailable == false) "Username is already taken" else null
+    val isFormValid = validateName(name.trim()) == null
+        && validateUsername(username.trim()) == null
+        && usernameAvailable != false
 
     LaunchedEffect(Unit) { visible = true }
 
@@ -276,11 +309,42 @@ fun SetProfileScreen(
                             prefix = {
                                 Text("@", color = secondaryText, fontSize = 16.sp)
                             },
+                            trailingIcon = {
+                                when {
+                                    isCheckingUsername && username.trim().length >= USERNAME_MIN_LENGTH -> {
+                                        CircularProgressIndicator(
+                                            modifier = Modifier.size(18.dp),
+                                            strokeWidth = 2.dp,
+                                            color = secondaryText
+                                        )
+                                    }
+                                    usernameAvailable == true && usernameError == null -> {
+                                        Icon(
+                                            imageVector = TablerIcons.Check,
+                                            contentDescription = "Available",
+                                            tint = Color(0xFF4CAF50),
+                                            modifier = Modifier.size(20.dp)
+                                        )
+                                    }
+                                    usernameAvailable == false -> {
+                                        Icon(
+                                            imageVector = TablerIcons.X,
+                                            contentDescription = "Taken",
+                                            tint = ErrorRed,
+                                            modifier = Modifier.size(20.dp)
+                                        )
+                                    }
+                                }
+                            },
                             isError = usernameError != null,
                             modifier = Modifier
                                 .fillMaxWidth()
                                 .clip(RoundedCornerShape(14.dp)),
                             singleLine = true,
+                            keyboardOptions = androidx.compose.foundation.text.KeyboardOptions(
+                                capitalization = androidx.compose.ui.text.input.KeyboardCapitalization.None,
+                                autoCorrect = false
+                            ),
                             colors = TextFieldDefaults.colors(
                                 focusedTextColor = textColor,
                                 unfocusedTextColor = textColor,
@@ -300,6 +364,13 @@ fun SetProfileScreen(
                                 color = ErrorRed,
                                 modifier = Modifier.padding(start = 16.dp, top = 4.dp)
                             )
+                        } else if (usernameAvailable == true) {
+                            Text(
+                                text = "Username is available!",
+                                fontSize = 12.sp,
+                                color = Color(0xFF4CAF50),
+                                modifier = Modifier.padding(start = 16.dp, top = 4.dp)
+                            )
                         } else {
                             Text(
                                 text = "Username is optional. People can use it to find you without sharing your key.",

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

@@ -8,6 +8,8 @@ import androidx.compose.foundation.shape.CircleShape
 import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.filled.*
+import compose.icons.TablerIcons
+import compose.icons.tablericons.*
 import androidx.compose.material3.*
 import androidx.compose.runtime.*
 import androidx.compose.ui.Alignment
@@ -81,7 +83,7 @@ fun WelcomeScreen(
         if (hasExistingAccount) {
             IconButton(onClick = onBack, modifier = Modifier.statusBarsPadding().padding(4.dp)) {
                 Icon(
-                        Icons.Default.ArrowBack,
+                        TablerIcons.ChevronLeft,
                         contentDescription = "Back",
                         tint = textColor.copy(alpha = 0.6f)
                 )

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

@@ -47,7 +47,8 @@ import androidx.compose.foundation.verticalScroll
 import androidx.compose.foundation.shape.CircleShape
 import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.material.icons.Icons
-import androidx.compose.material.icons.filled.ArrowBack
+import compose.icons.TablerIcons
+import compose.icons.tablericons.*
 import androidx.compose.material.icons.filled.ExitToApp
 import androidx.compose.material.icons.filled.Lock
 import androidx.compose.material.icons.filled.Message
@@ -998,7 +999,7 @@ fun GroupInfoScreen(
         ) {
             IconButton(onClick = onBack, modifier = Modifier.align(Alignment.TopStart)) {
                 Icon(
-                    imageVector = Icons.Default.ArrowBack,
+                    imageVector = TablerIcons.ChevronLeft,
                     contentDescription = "Back",
                     tint = Color.White
                 )
@@ -1752,7 +1753,7 @@ private fun GroupEncryptionKeyPage(
             ) {
                 IconButton(onClick = onBack) {
                     Icon(
-                        imageVector = Icons.Default.ArrowBack,
+                        imageVector = TablerIcons.ChevronLeft,
                         contentDescription = "Back",
                         tint = Color.White
                     )

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

@@ -18,7 +18,6 @@ import androidx.compose.foundation.lazy.grid.*
 import androidx.compose.foundation.shape.CircleShape
 import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.material.icons.Icons
-import androidx.compose.material.icons.filled.ArrowBack
 import androidx.compose.material.icons.filled.Check
 import androidx.compose.material3.*
 import androidx.compose.runtime.*
@@ -48,6 +47,7 @@ import com.rosetta.messenger.ui.icons.TelegramIcons
 import com.rosetta.messenger.ui.onboarding.PrimaryBlue
 import compose.icons.TablerIcons
 import compose.icons.tablericons.ChevronDown
+import compose.icons.tablericons.ChevronLeft
 import compose.icons.tablericons.PhotoOff
 import kotlinx.coroutines.coroutineScope
 import kotlinx.coroutines.delay
@@ -730,7 +730,7 @@ internal fun ExpandedHeader(
                     modifier = Modifier.size(40.dp)
                 ) {
                     Icon(
-                        imageVector = Icons.Default.ArrowBack,
+                        imageVector = TablerIcons.ChevronLeft,
                         contentDescription = "Close gallery",
                         tint = textColor
                     )

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

@@ -13,7 +13,8 @@ import androidx.compose.foundation.lazy.items
 import androidx.compose.foundation.shape.CircleShape
 import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.material.icons.Icons
-import androidx.compose.material.icons.filled.ArrowBack
+import compose.icons.TablerIcons
+import compose.icons.tablericons.*
 import androidx.compose.material3.*
 import androidx.compose.runtime.*
 import androidx.compose.ui.Alignment
@@ -438,7 +439,7 @@ private fun FilePickerTopBar(
         if (showBack) {
             IconButton(onClick = onBackClick) {
                 Icon(
-                    imageVector = Icons.Default.ArrowBack,
+                    imageVector = TablerIcons.ChevronLeft,
                     contentDescription = "Back",
                     tint = textColor
                 )

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

@@ -530,7 +530,7 @@ fun ImageViewerScreen(
                     modifier = Modifier.align(Alignment.CenterStart)
                 ) {
                     Icon(
-                        imageVector = Icons.Default.ArrowBack,
+                        imageVector = TablerIcons.ChevronLeft,
                         contentDescription = "Close",
                         tint = Color.White
                     )

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

@@ -888,7 +888,7 @@ fun MediaPickerBottomSheet(
                                     modifier = Modifier.size(40.dp)
                                 ) {
                                     Icon(
-                                        imageVector = Icons.Default.ArrowBack,
+                                        imageVector = TablerIcons.ChevronLeft,
                                         contentDescription = "Close gallery",
                                         tint = textColor
                                     )

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

@@ -683,7 +683,8 @@ fun MessageInputBar(
                                             } else if (msg.text.isEmpty() && hasImageAttachment) {
                                                 "Photo"
                                             } else {
-                                                val shortText = msg.text.take(40)
+                                                val codePoints = msg.text.codePoints().limit(40).toArray()
+                                                val shortText = String(codePoints, 0, codePoints.size)
                                                 if (shortText.length < msg.text.length) "$shortText..." else shortText
                                             }
                                         } else "${panelReplyMessages.size} messages",

app/src/main/java/com/rosetta/messenger/ui/crashlogs/CrashLogsScreen.kt

@@ -7,7 +7,8 @@ import androidx.compose.foundation.layout.*
 import androidx.compose.foundation.lazy.LazyColumn
 import androidx.compose.foundation.lazy.items
 import androidx.compose.material.icons.Icons
-import androidx.compose.material.icons.filled.ArrowBack
+import compose.icons.TablerIcons
+import compose.icons.tablericons.*
 import androidx.compose.material.icons.filled.BugReport
 import androidx.compose.material.icons.filled.ContentCopy
 import androidx.compose.material.icons.filled.Delete
@@ -84,7 +85,7 @@ fun CrashLogsScreen(
                     title = { Text("Crash Logs") },
                     navigationIcon = {
                         IconButton(onClick = onBackClick) {
-                            Icon(Icons.Default.ArrowBack, contentDescription = "Back")
+                            Icon(TablerIcons.ChevronLeft, contentDescription = "Back")
                         }
                     },
                     actions = {
@@ -293,7 +294,7 @@ private fun CrashDetailScreen(
                 title = { Text("Crash Details") },
                 navigationIcon = {
                     IconButton(onClick = onBackClick) {
-                        Icon(Icons.Default.ArrowBack, contentDescription = "Back")
+                        Icon(TablerIcons.ChevronLeft, contentDescription = "Back")
                     }
                 },
                 actions = {

app/src/main/java/com/rosetta/messenger/ui/settings/BackupScreen.kt

@@ -14,7 +14,8 @@ import androidx.compose.foundation.verticalScroll
 import androidx.compose.ui.draw.clip
 import androidx.compose.ui.graphics.SolidColor
 import androidx.compose.material.icons.Icons
-import androidx.compose.material.icons.filled.ArrowBack
+import compose.icons.TablerIcons
+import compose.icons.tablericons.*
 import androidx.compose.material.icons.filled.ContentCopy
 import androidx.compose.material.icons.filled.Visibility
 import androidx.compose.material.icons.filled.VisibilityOff
@@ -67,7 +68,7 @@ fun BackupScreen(
         ) {
             IconButton(onClick = onBack) {
                 Icon(
-                    imageVector = Icons.Filled.ArrowBack,
+                    imageVector = TablerIcons.ChevronLeft,
                     contentDescription = "Back",
                     tint = textColor
                 )