refactor(tv): extract hero backdrop and simplify gradient drawing

Split the hero backdrop (image + gradient overlays) into TvHomeHeroBackdrop, rendered behind the home content. Replace nested Box/background gradient approach with drawWithContent for better composability. Clean up unused imports across TvHomeScreen, TvFocusedItemHero, and TvHomeContent.

app-tv/src/main/java/hu/bbara/purefin/ui/screen/home/TvHomeScreen.kt

@@ -1,6 +1,6 @@
 package hu.bbara.purefin.ui.screen.home
 
-import androidx.compose.foundation.background
+import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.fillMaxWidth
@@ -10,11 +10,12 @@ import androidx.compose.runtime.Composable
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
 import androidx.compose.ui.Modifier
+import hu.bbara.purefin.core.model.LibraryUiModel
 import hu.bbara.purefin.core.model.MediaUiModel
 import hu.bbara.purefin.core.model.MovieUiModel
-import hu.bbara.purefin.core.model.LibraryUiModel
 import hu.bbara.purefin.ui.screen.home.components.TvFocusedItemHero
 import hu.bbara.purefin.ui.screen.home.components.TvHomeContent
+import hu.bbara.purefin.ui.screen.home.components.TvHomeHeroBackdrop
 import java.util.UUID
 
 @Composable
@@ -30,11 +31,13 @@ fun TvHomeScreen(
     val focusedMediaUiModel = remember { mutableStateOf<MediaUiModel>(MovieUiModel.createPlaceholder()) }
 
     Surface(
-        modifier = modifier
-            .fillMaxSize()
-            .background(scheme.background)
+        modifier = modifier.fillMaxSize(),
+        color = scheme.background
     ) {
-
+        Box(modifier = Modifier.fillMaxSize()) {
+            TvHomeHeroBackdrop(
+                backdropImageUrl = focusedMediaUiModel.value.backdropImageUrl
+            )
             Column(
                 modifier = Modifier.fillMaxSize()
             ) {
@@ -56,4 +59,5 @@ fun TvHomeScreen(
                 )
             }
         }
+    }
 }

app-tv/src/main/java/hu/bbara/purefin/ui/screen/home/components/TvFocusedItemHero.kt

@@ -2,9 +2,7 @@ package hu.bbara.purefin.ui.screen.home.components
 
 import androidx.compose.animation.Crossfade
 import androidx.compose.animation.core.tween
-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.Row
 import androidx.compose.foundation.layout.fillMaxHeight
@@ -16,6 +14,7 @@ import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.draw.drawWithContent
 import androidx.compose.ui.graphics.Brush
 import androidx.compose.ui.layout.ContentScale
 import androidx.compose.ui.platform.testTag
@@ -31,40 +30,34 @@ internal const val TvHomeHeroTitleTag = "tv-home-hero-title"
 internal const val TvHomeHeroProgressLabelTag = "tv-home-hero-progress-label"
 
 private const val TvHomeHeroAnimationMillis = 180
-// Half the screen for the billboard, half for the content rows. Tuned so both
-// the hero block and the first focused row fit on a 540dp-tall (1080p xhdpi) TV.
+// The billboard backdrop covers the top portion of the home screen so the hero
+// text sits at the bottom of the backdrop and the content rows begin below it.
 internal const val TvHomeHeroHeightFraction = 0.45f
+internal const val TvHomeBackdropOffset = 0.20f
 
+/**
+ * The home screen background image plus the darkening gradients that keep the
+ * hero text readable. Drawn behind the home content and sized to the top
+ * [TvHomeHeroHeightFraction] of the screen.
+ */
 @Composable
-internal fun TvFocusedItemHero(
-    item: MediaUiModel,
+internal fun TvHomeHeroBackdrop(
+    backdropImageUrl: String?,
     modifier: Modifier = Modifier,
-    heightFraction: Float = TvHomeHeroHeightFraction,
+    heightFraction: Float = TvHomeHeroHeightFraction + TvHomeBackdropOffset,
 ) {
     val scheme = MaterialTheme.colorScheme
-    Box(
+    Crossfade(
+        targetState = backdropImageUrl,
+        animationSpec = tween(durationMillis = TvHomeHeroAnimationMillis),
+        label = "tv-home-hero-backdrop",
         modifier = modifier
             .fillMaxWidth()
             .fillMaxHeight(heightFraction)
-            .background(scheme.background)
-    ) {
-        Crossfade(
-            targetState = item.backdropImageUrl,
-            animationSpec = tween(durationMillis = TvHomeHeroAnimationMillis),
-            label = "tv-home-hero-background"
-        ) { imageUrl ->
-            PurefinAsyncImage(
-                model = imageUrl,
-                contentDescription = null,
-                modifier = Modifier.fillMaxSize(),
-                contentScale = ContentScale.Crop
-            )
-        }
+            .drawWithContent {
+                drawContent()
                 // Darken the left side so the text block stays readable over any backdrop.
-        Box(
-            modifier = Modifier
-                .fillMaxSize()
-                .background(
+                drawRect(
                     Brush.horizontalGradient(
                         colorStops = arrayOf(
                             0.0f to scheme.background.copy(alpha = 0.86f),
@@ -74,12 +67,8 @@ internal fun TvFocusedItemHero(
                         )
                     )
                 )
-        )
                 // Strong bottom fade so the title and metadata are legible.
-        Box(
-            modifier = Modifier
-                .fillMaxSize()
-                .background(
+                drawRect(
                     Brush.verticalGradient(
                         colorStops = arrayOf(
                             0.0f to scheme.background.copy(alpha = 0f),
@@ -89,11 +78,31 @@ internal fun TvFocusedItemHero(
                         )
                     )
                 )
+            }
+    ) { imageUrl ->
+        PurefinAsyncImage(
+            model = imageUrl,
+            contentDescription = null,
+            modifier = Modifier.fillMaxSize(),
+            contentScale = ContentScale.Crop
         )
+    }
+}
+
+@Composable
+internal fun TvFocusedItemHero(
+    item: MediaUiModel,
+    modifier: Modifier = Modifier,
+    heightFraction: Float = TvHomeHeroHeightFraction,
+) {
+    val scheme = MaterialTheme.colorScheme
     Crossfade(
         targetState = item,
         animationSpec = tween(durationMillis = TvHomeHeroAnimationMillis),
-            label = "tv-home-hero-content"
+        label = "tv-home-hero-content",
+        modifier = modifier
+            .fillMaxWidth()
+            .fillMaxHeight(heightFraction)
     ) { hero ->
         Column(
             verticalArrangement = Arrangement.Bottom,
@@ -129,7 +138,6 @@ internal fun TvFocusedItemHero(
             }
         }
     }
-    }
 }
 
 @Composable

app-tv/src/main/java/hu/bbara/purefin/ui/screen/home/components/TvHomeContent.kt

@@ -2,7 +2,6 @@
 
 package hu.bbara.purefin.ui.screen.home.components
 
-import androidx.compose.foundation.background
 import androidx.compose.foundation.gestures.LocalBringIntoViewSpec
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.PaddingValues
@@ -11,7 +10,6 @@ import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.height
 import androidx.compose.foundation.lazy.LazyColumn
 import androidx.compose.foundation.lazy.itemsIndexed
-import androidx.compose.material3.MaterialTheme
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.CompositionLocalProvider
 import androidx.compose.runtime.LaunchedEffect
@@ -42,7 +40,6 @@ fun TvHomeContent(
     contentPadding: PaddingValues = PaddingValues(bottom = 32.dp),
     modifier: Modifier = Modifier,
 ) {
-    val scheme = MaterialTheme.colorScheme
     val topOffsetPx = with(LocalDensity.current) { TvHomeFocusedItemTopOffset.toPx() }
     val hasContinueWatching = continueWatching.isNotEmpty()
     val hasNextUp = nextUp.isNotEmpty()
@@ -65,7 +62,6 @@ fun TvHomeContent(
         LazyColumn(
             modifier = modifier
                 .fillMaxSize()
-                .background(scheme.background)
                 .focusRequester(initialFocusRequester),
             verticalArrangement = Arrangement.spacedBy(24.dp),
             contentPadding = contentPadding