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
@@ -74,7 +78,12 @@ class MainActivity : BaseEventActivity() {
         disableTrackpadSounds()
         WindowCompat.setDecorFitsSystemWindows(window, false)
         setContent {
-            MaterialTheme {
+            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()
@@ -86,6 +95,7 @@ class MainActivity : BaseEventActivity() {
                     }
                 }
             }
+        }
         hideSystemBars()
         log("ui", "иммерсивный режим включён")
         val filter = IntentFilter().apply {
@@ -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)