android: add wallpaper-aware chat background and overlays

android/CHANGELOG.md

@@ -228,3 +228,8 @@
 - Added archive statistics stream in `ChatListViewModel` and special archive top-row entry in `All` tab.
 - Extended list preview formatting with media-type markers and retained unread/mention/pinned indicators.
 - Updated Telegram UI checklists for chat-list advanced states (batch 2 and batch 3).
+
+### Step 37 - Chat UI / wallpaper-aware readability
+- Added gradient wallpaper-like chat background layer in `ChatScreen`.
+- Kept pinned/composer/action surfaces on semi-transparent containers to preserve readability over wallpaper.
+- Updated Telegram UI checklist items for wallpaper and overlay readability.

android/app/src/main/java/ru/daemonlord/messenger/ui/chat/ChatScreen.kt

@@ -47,6 +47,8 @@ import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.layout.ContentScale
 import androidx.compose.ui.draw.clip
 import androidx.compose.ui.unit.dp
+import androidx.compose.ui.graphics.Brush
+import androidx.compose.ui.graphics.Color
 import androidx.compose.foundation.layout.WindowInsets
 import androidx.compose.foundation.layout.safeDrawing
 import androidx.hilt.navigation.compose.hiltViewModel
@@ -120,6 +122,15 @@ fun ChatScreen(
     Column(
         modifier = Modifier
             .fillMaxSize()
+            .background(
+                brush = Brush.verticalGradient(
+                    colors = listOf(
+                        Color(0xFF1B1A22),
+                        Color(0xFF242034),
+                        Color(0xFF1A202A),
+                    ),
+                ),
+            )
             .windowInsetsPadding(WindowInsets.safeDrawing),
     ) {
         Row(