feat(player): pause playback on lifecycle stop event for improved resource management

app/src/main/java/hu/bbara/purefin/ui/screen/player/PlayerScreen.kt

@@ -34,6 +34,8 @@ import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.unit.dp
 import androidx.compose.ui.viewinterop.AndroidView
+import androidx.lifecycle.Lifecycle
+import androidx.lifecycle.compose.LifecycleEventEffect
 import androidx.media3.common.util.UnstableApi
 import androidx.media3.ui.AspectRatioFrameLayout
 import androidx.media3.ui.PlayerView
@@ -73,6 +75,10 @@ fun PlayerScreen(
     var horizontalSeekFeedback by remember { mutableStateOf<Long?>(null) }
     val overlayController = rememberPersistentOverlayController()
 
+    LifecycleEventEffect(Lifecycle.Event.ON_STOP) {
+        viewModel.pausePlayback()
+    }
+
     LaunchedEffect(uiState.isPlaying) {
         if (uiState.isPlaying) {
             showQueuePanel = false