UI changes and fixes (#301)

* country -> region, region –> province

* revise clicks

* fix longpress for mention etc

* scroll down button wip

* fix distance

* fix button

* fix header icon

app/src/main/java/com/bitchat/android/ui/ChatHeader.kt

@@ -487,30 +487,6 @@ private fun MainHeader(
             verticalAlignment = Alignment.CenterVertically,
             horizontalArrangement = Arrangement.spacedBy(10.dp)
         ) {
-            // Unread indicator (like iOS)
-            if (hasUnreadPrivateMessages.isNotEmpty()) {
-                Button(
-                    onClick = { 
-                        // Open most relevant private chat (first unread)
-                        val firstUnread = hasUnreadPrivateMessages.firstOrNull()
-                        if (firstUnread != null) {
-                            viewModel.startPrivateChat(firstUnread)
-                        }
-                    },
-                    colors = ButtonDefaults.buttonColors(
-                        containerColor = Color.Transparent,
-                        contentColor = Color(0xFFFF9500)
-                    ),
-                    contentPadding = PaddingValues(4.dp)
-                ) {
-                    Icon(
-                        imageVector = Icons.Filled.Email,
-                        contentDescription = "Open unread private chat",
-                        modifier = Modifier.size(12.dp),
-                        tint = Color(0xFFFF9500)
-                    )
-                }
-            }
             
             // Location channels button (matching iOS implementation)
             LocationChannelsButton(

app/src/main/java/com/bitchat/android/ui/ChatScreen.kt

@@ -9,6 +9,12 @@ import androidx.compose.runtime.*
 import androidx.compose.runtime.livedata.observeAsState
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.Alignment
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.filled.ArrowDownward
+import androidx.compose.foundation.BorderStroke
+import androidx.compose.foundation.shape.CircleShape
+import androidx.compose.material3.IconButton
 import androidx.compose.ui.text.TextRange
 import androidx.compose.ui.text.input.TextFieldValue
 import androidx.compose.ui.unit.dp
@@ -55,6 +61,7 @@ fun ChatScreen(viewModel: ChatViewModel) {
     var selectedUserForSheet by remember { mutableStateOf("") }
     var selectedMessageForSheet by remember { mutableStateOf<BitchatMessage?>(null) }
     var forceScrollToBottom by remember { mutableStateOf(false) }
+    var isScrolledUp by remember { mutableStateOf(false) }
 
     // Show password dialog when needed
     LaunchedEffect(showPasswordPrompt) {
@@ -100,6 +107,7 @@ fun ChatScreen(viewModel: ChatViewModel) {
                 meshService = viewModel.meshService,
                 modifier = Modifier.weight(1f),
                 forceScrollToBottom = forceScrollToBottom,
+                onScrolledUpChanged = { isUp -> isScrolledUp = isUp },
                 onNicknameClick = { fullSenderName ->
                     // Single click - mention user in text input
                     val currentText = messageText.text
@@ -220,6 +228,35 @@ fun ChatScreen(viewModel: ChatViewModel) {
             )
         }
 
+        // Scroll-to-bottom floating button
+        AnimatedVisibility(
+            visible = isScrolledUp && !showSidebar,
+            enter = slideInVertically(initialOffsetY = { it / 2 }) + fadeIn(),
+            exit = slideOutVertically(targetOffsetY = { it / 2 }) + fadeOut(),
+            modifier = Modifier
+                .align(Alignment.BottomEnd)
+                .padding(end = 16.dp, bottom = 64.dp)
+                .zIndex(1.5f)
+                .windowInsetsPadding(WindowInsets.navigationBars)
+                .windowInsetsPadding(WindowInsets.ime)
+        ) {
+            Surface(
+                shape = CircleShape,
+                color = colorScheme.background,
+                tonalElevation = 3.dp,
+                shadowElevation = 6.dp,
+                border = BorderStroke(2.dp, Color(0xFF00C851))
+            ) {
+                IconButton(onClick = { forceScrollToBottom = !forceScrollToBottom }) {
+                    Icon(
+                        imageVector = Icons.Filled.ArrowDownward,
+                        contentDescription = "Scroll to bottom",
+                        tint = Color(0xFF00C851)
+                    )
+                }
+            }
+        }
+
         AnimatedVisibility(
             visible = showSidebar,
             enter = slideInHorizontally(

app/src/main/java/com/bitchat/android/ui/MessageComponents.kt

@@ -2,22 +2,27 @@ package com.bitchat.android.ui
 
 import androidx.compose.foundation.ExperimentalFoundationApi
 import androidx.compose.foundation.combinedClickable
+import androidx.compose.foundation.gestures.detectTapGestures
 import androidx.compose.foundation.layout.*
 import androidx.compose.foundation.lazy.LazyColumn
 import androidx.compose.foundation.lazy.items
 import androidx.compose.foundation.lazy.rememberLazyListState
-import androidx.compose.foundation.text.ClickableText
+ 
 
 import androidx.compose.material3.*
 import androidx.compose.runtime.*
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.input.pointer.pointerInput
+import androidx.compose.ui.text.TextLayoutResult
 import androidx.compose.ui.text.font.FontFamily
 import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.text.style.TextOverflow
 import androidx.compose.ui.unit.dp
 import androidx.compose.ui.unit.sp
+import androidx.compose.ui.hapticfeedback.HapticFeedbackType
+import androidx.compose.ui.platform.LocalHapticFeedback
 import com.bitchat.android.model.BitchatMessage
 import com.bitchat.android.model.DeliveryStatus
 import com.bitchat.android.mesh.BluetoothMeshService
@@ -36,6 +41,7 @@ fun MessagesList(
     meshService: BluetoothMeshService,
     modifier: Modifier = Modifier,
     forceScrollToBottom: Boolean = false,
+    onScrolledUpChanged: ((Boolean) -> Unit)? = null,
     onNicknameClick: ((String) -> Unit)? = null,
     onMessageLongPress: ((BitchatMessage) -> Unit)? = null
 ) {
@@ -63,9 +69,20 @@ fun MessagesList(
         }
     }
     
+    // Track whether user has scrolled away from the latest messages
+    val isAtLatest by remember {
+        derivedStateOf {
+            val firstVisibleIndex = listState.layoutInfo.visibleItemsInfo.firstOrNull()?.index ?: -1
+            firstVisibleIndex <= 2
+        }
+    }
+    LaunchedEffect(isAtLatest) {
+        onScrolledUpChanged?.invoke(!isAtLatest)
+    }
+    
     // Force scroll to bottom when requested (e.g., when user sends a message)
     LaunchedEffect(forceScrollToBottom) {
-        if (forceScrollToBottom && messages.isNotEmpty()) {
+        if (messages.isNotEmpty()) {
             // With reverseLayout=true and reversed data, latest is at index 0
             listState.animateScrollToItem(0)
         }
@@ -181,42 +198,52 @@ private fun MessageTextWithClickableNicknames(
                  message.sender.startsWith("$currentUserNickname#")
     
     if (!isSelf && (onNicknameClick != null || onMessageLongPress != null)) {
-        // Use Text with combinedClickable for nickname interactions and message long press
+        val haptic = LocalHapticFeedback.current
+        var textLayoutResult by remember { mutableStateOf<TextLayoutResult?>(null) }
         Text(
             text = annotatedText,
-            modifier = modifier.combinedClickable(
-                onClick = {
-                    // We can't get the click offset here, so we'll handle the first nickname
-                    val nicknameAnnotations = annotatedText.getStringAnnotations(
-                        tag = "nickname_click",
-                        start = 0,
-                        end = annotatedText.length
-                    )
-                    if (nicknameAnnotations.isNotEmpty()) {
-                        val nickname = nicknameAnnotations.first().item
-                        onNicknameClick?.invoke(nickname)
+            modifier = modifier.pointerInput(message) {
+                detectTapGestures(
+                    onTap = { position ->
+                        val layout = textLayoutResult ?: return@detectTapGestures
+                        val offset = layout.getOffsetForPosition(position)
+                        val nicknameAnnotations = annotatedText.getStringAnnotations(
+                            tag = "nickname_click",
+                            start = offset,
+                            end = offset
+                        )
+                        if (nicknameAnnotations.isNotEmpty()) {
+                            val nickname = nicknameAnnotations.first().item
+                            haptic.performHapticFeedback(HapticFeedbackType.TextHandleMove)
+                            onNicknameClick?.invoke(nickname)
+                        }
+                    },
+                    onLongPress = {
+                        haptic.performHapticFeedback(HapticFeedbackType.LongPress)
+                        onMessageLongPress?.invoke(message)
                     }
-                },
-                onLongClick = {
-                    // Always use message long press - contains all necessary information
-                    onMessageLongPress?.invoke(message)
-                }
-            ),
+                )
+            },
             fontFamily = FontFamily.Monospace,
             softWrap = true,
             overflow = TextOverflow.Visible,
             style = androidx.compose.ui.text.TextStyle(
                 color = colorScheme.onSurface
-            )
+            ),
+            onTextLayout = { result -> textLayoutResult = result }
         )
     } else {
         // Use regular text with message long press support for own messages
+        val haptic = LocalHapticFeedback.current
         Text(
             text = annotatedText,
             modifier = if (onMessageLongPress != null) {
                 modifier.combinedClickable(
                     onClick = { /* No action for own messages */ },
-                    onLongClick = { onMessageLongPress.invoke(message) }
+                    onLongClick = {
+                        haptic.performHapticFeedback(HapticFeedbackType.LongPress)
+                        onMessageLongPress.invoke(message)
+                    }
                 )
             } else {
                 modifier