fix: eliminate modern home expand-from-topleft glitch on initial load

- Use EnterTransition.None for first appearance instead of fadeIn(320ms)
- Initialize heroItem synchronously from carouselRows instead of null
- Subsequent navigations still use fadeIn + slideInVertically animation

app/src/main/java/com/nuvio/tv/ui/screens/home/HomeScreen.kt

@@ -1,6 +1,7 @@
 package com.nuvio.tv.ui.screens.home
 
 import androidx.compose.animation.AnimatedVisibility
+import androidx.compose.animation.EnterTransition
 import androidx.compose.animation.core.tween
 import androidx.compose.animation.fadeIn
 import androidx.compose.animation.slideInVertically
@@ -224,7 +225,7 @@ fun HomeScreen(
                                     animationSpec = tween(320)
                                 )
                         } else {
-                            fadeIn(animationSpec = tween(320))
+                            EnterTransition.None
                         }
                     ) {
                         when (uiState.homeLayout) {

app/src/main/java/com/nuvio/tv/ui/screens/home/ModernHomeContent.kt

@@ -207,7 +207,10 @@ fun ModernHomeContent(
     var pendingRowFocusKey by remember { mutableStateOf<String?>(null) }
     var pendingRowFocusIndex by remember { mutableStateOf<Int?>(null) }
     var pendingRowFocusNonce by remember { mutableIntStateOf(0) }
-    var heroItem by remember { mutableStateOf<HeroPreview?>(null) }
+    var heroItem by remember {
+        val initialHero = carouselRows.firstOrNull()?.items?.firstOrNull()?.heroPreview
+        mutableStateOf<HeroPreview?>(initialHero)
+    }
     val heroTransitioningRef = remember { java.util.concurrent.atomic.AtomicBoolean(false) }
     var restoredFromSavedState by remember { mutableStateOf(false) }
     var optionsItem by remember { mutableStateOf<ContinueWatchingItem?>(null) }