Remove unnecessary Box wrapper

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

@@ -100,14 +100,12 @@ fun ChatScreen(viewModel: ChatViewModel) {
             Spacer(modifier = Modifier.height(headerHeight))
             
             // Messages area - takes up available space, will compress when keyboard appears
-            Box(modifier = Modifier.weight(1f)) {
-                MessagesList(
-                    messages = displayMessages,
-                    currentUserNickname = nickname,
-                    meshService = viewModel.meshService,
-                    modifier = Modifier.fillMaxSize()
-                )
-            }
+            MessagesList(
+                messages = displayMessages,
+                currentUserNickname = nickname,
+                meshService = viewModel.meshService,
+                modifier = Modifier.weight(1f)
+            )
             
             // Input area - stays at bottom
             ChatInputSection(

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

@@ -42,10 +42,10 @@ fun MessagesList(
         }
     }
     
-    SelectionContainer {
+    SelectionContainer(modifier = modifier) {
         LazyColumn(
             state = listState,
-            modifier = modifier.padding(horizontal = 12.dp, vertical = 8.dp),
+            modifier = Modifier.padding(horizontal = 12.dp, vertical = 8.dp),
             verticalArrangement = Arrangement.spacedBy(2.dp)
         ) {
             items(messages) { message ->