Disable overlay bakground animation (#170)

* remove slider background from animation, show only when slider is shown

* cleanup unused import in chatscreen

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

@@ -4,39 +4,16 @@ import androidx.compose.animation.*
 import androidx.compose.animation.core.*
 import androidx.compose.foundation.*
 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.shape.CircleShape
-import androidx.compose.foundation.shape.RoundedCornerShape
-import androidx.compose.foundation.text.BasicTextField
-import androidx.compose.foundation.text.KeyboardActions
-import androidx.compose.foundation.text.KeyboardOptions
-import androidx.compose.material.icons.Icons
-import androidx.compose.material.icons.filled.*
 import androidx.compose.material3.*
 import androidx.compose.runtime.*
 import androidx.compose.runtime.livedata.observeAsState
-import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.graphics.Color
-import androidx.compose.ui.graphics.SolidColor
-import androidx.compose.ui.platform.LocalFocusManager
 import androidx.compose.ui.text.TextRange
-import androidx.compose.ui.text.font.FontFamily
-import androidx.compose.ui.text.font.FontWeight
-import androidx.compose.ui.text.input.ImeAction
 import androidx.compose.ui.text.input.TextFieldValue
-import androidx.compose.ui.text.style.TextOverflow
 import androidx.compose.ui.unit.dp
 import androidx.compose.ui.unit.Dp
-import androidx.compose.ui.unit.sp
 import androidx.compose.ui.zIndex
-import com.bitchat.android.model.BitchatMessage
-import com.bitchat.android.model.DeliveryStatus
-import com.bitchat.android.mesh.BluetoothMeshService
-import java.text.SimpleDateFormat
-import java.util.*
 
 /**
  * Main ChatScreen - REFACTORED to use component-based architecture
@@ -162,7 +139,25 @@ fun ChatScreen(viewModel: ChatViewModel) {
             onPanicClear = { viewModel.panicClearAllData() }
         )
 
-        // Sidebar overlay
+        val alpha by animateFloatAsState(
+            targetValue = if (showSidebar) 0.5f else 0f,
+            animationSpec = tween(
+                durationMillis = 300,
+                easing = EaseOutCubic
+            ), label = "overlayAlpha"
+        )
+
+        // Only render the background if it's visible
+        if (alpha > 0f) {
+            Box(
+                modifier = Modifier
+                    .fillMaxSize()
+                    .background(Color.Black.copy(alpha = alpha))
+                    .clickable { viewModel.hideSidebar() }
+                    .zIndex(1f)
+            )
+        }
+
         AnimatedVisibility(
             visible = showSidebar,
             enter = slideInHorizontally(

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

@@ -45,11 +45,7 @@ fun SidebarOverlay(
     val peerNicknames = viewModel.meshService.getPeerNicknames()
     val peerRSSI = viewModel.meshService.getPeerRSSI()
     
-    Box(
+    Box(modifier = modifier) {
-        modifier = modifier
-            .background(Color.Black.copy(alpha = 0.5f))
-            .clickable { onDismiss() }
-    ) {
         Row(
             modifier = Modifier
                 .fillMaxHeight()