fix(app-glasses): фон очков чёрный полностью

ConnectionScreen был без фона — светлый MaterialTheme. Теперь
darkColorScheme + чёрный Box-корень вокруг обоих экранов + страховка
background(Color.Black) в ConnectionScreen. Проверено скрином:
все пиксели #000000.

app-glasses/src/main/kotlin/pw/binom/viewmate/glasses/MainActivity.kt

@@ -13,7 +13,9 @@ import android.view.KeyEvent
 import android.view.MotionEvent
 import java.io.File
 import androidx.activity.compose.setContent
+import androidx.compose.foundation.background
 import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.fillMaxWidth
@@ -22,10 +24,12 @@ import androidx.compose.foundation.lazy.LazyColumn
 import androidx.compose.foundation.lazy.items
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Text
+import androidx.compose.material3.darkColorScheme
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.collectAsState
 import androidx.compose.runtime.getValue
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.unit.dp
 import androidx.core.view.WindowCompat
 import androidx.core.view.WindowInsetsCompat
@@ -74,15 +78,21 @@ class MainActivity : BaseEventActivity() {
         disableTrackpadSounds()
         WindowCompat.setDecorFitsSystemWindows(window, false)
         setContent {
-            MaterialTheme {
-                val controller = GlassesApp.instance.movieController
-                val movieActive by controller.movieActive.collectAsState()
-                val title by controller.title.collectAsState()
-                val player = controller.player
-                if (movieActive && player != null) {
-                    GlassesMovieScreen(player = player, title = title)
-                } else {
-                    ConnectionScreen()
+            MaterialTheme(colorScheme = darkColorScheme()) {
+                Box(
+                    modifier = Modifier
+                        .fillMaxSize()
+                        .background(Color.Black)
+                ) {
+                    val controller = GlassesApp.instance.movieController
+                    val movieActive by controller.movieActive.collectAsState()
+                    val title by controller.title.collectAsState()
+                    val player = controller.player
+                    if (movieActive && player != null) {
+                        GlassesMovieScreen(player = player, title = title)
+                    } else {
+                        ConnectionScreen()
+                    }
                 }
             }
         }
@@ -236,7 +246,7 @@ fun ConnectionScreen() {
     val messages by connection.messages.collectAsState()
 
     Column(
-        modifier = Modifier.fillMaxSize().padding(24.dp),
+        modifier = Modifier.fillMaxSize().background(Color.Black).padding(24.dp),
         verticalArrangement = Arrangement.spacedBy(8.dp),
     ) {
         Text("ViewMate Glasses", style = MaterialTheme.typography.headlineMedium)