Refine home screen card styling and visual hierarchy

Updated various home screen components (`ContinueWatchingCard`, `HomeBrowseCard`, `NextUpCard`, `HomeSearchResultCard`, etc.) to simplify their appearance and improve readability:

- Removed `tonalElevation` from multiple Surface containers.
- Replaced `surfaceVariant` backgrounds and `onSurfaceVariant` text colors with `surface` and `onSurface` for better contrast.
- Removed the thin border from `HomeBrowseCard`.
- Darkened the gradient overlay on `HomeFeaturedCard` for better text legibility and adjusted the progress bar padding.

app/src/main/java/hu/bbara/purefin/app/home/ui/continuewatching/ContinueWatchingCard.kt

@@ -59,7 +59,6 @@ internal fun ContinueWatchingCard(
     Surface(
         shape = RoundedCornerShape(26.dp),
         color = scheme.surfaceContainer,
-        tonalElevation = 3.dp,
         modifier = modifier.width(320.dp)
     ) {
         Column(
@@ -126,7 +125,7 @@ internal fun ContinueWatchingCard(
                     Text(
                         text = supportingText,
                         style = MaterialTheme.typography.bodySmall,
-                        color = scheme.onSurfaceVariant,
+                        color = scheme.onSurface,
                         maxLines = 1,
                         overflow = TextOverflow.Ellipsis
                     )

app/src/main/java/hu/bbara/purefin/app/home/ui/featured/HomeFeaturedCard.kt

@@ -40,7 +40,6 @@ internal fun HomeFeaturedCard(
     Surface(
         color = scheme.surfaceContainerLow,
         shape = RoundedCornerShape(30.dp),
-        tonalElevation = 4.dp,
         modifier = modifier
             .fillMaxWidth()
             .clip(RoundedCornerShape(30.dp))
@@ -63,9 +62,9 @@ internal fun HomeFeaturedCard(
                     .background(
                         Brush.verticalGradient(
                             colors = listOf(
-                                Color.Black.copy(alpha = 0.08f),
-                                Color.Black.copy(alpha = 0.18f),
-                                Color.Black.copy(alpha = 0.72f)
+                                Color.Black.copy(alpha = 0.44f),
+                                Color.Black.copy(alpha = 0.44f),
+                                Color.Black.copy(alpha = 0.80f)
                             )
                         )
                     )
@@ -115,6 +114,7 @@ internal fun HomeFeaturedCard(
                     foregroundColor = scheme.primary,
                     backgroundColor = Color.White.copy(alpha = 0.26f),
                     modifier = Modifier.align(Alignment.BottomStart)
+                        .padding(bottom = 6.dp, start = 6.dp, end = 6.dp)
                 )
             }
         }

app/src/main/java/hu/bbara/purefin/app/home/ui/library/HomeBrowseCard.kt

@@ -1,7 +1,6 @@
 package hu.bbara.purefin.app.home.ui.library
 
 import androidx.compose.foundation.background
-import androidx.compose.foundation.border
 import androidx.compose.foundation.clickable
 import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.Column
@@ -84,10 +83,7 @@ internal fun HomeBrowseCard(
                     .fillMaxWidth()
                     .aspectRatio(16f / 10f)
                     .clip(RoundedCornerShape(topStart = 12.dp, topEnd = 12.dp))
-                    .border(
-                        1.dp, scheme.outlineVariant.copy(alpha = 0.35f), RoundedCornerShape(18.dp)
-                    )
-                    .background(scheme.surfaceVariant)
+                    .background(scheme.surface)
             ) {
                 PurefinAsyncImage(
                     model = item.imageUrl,
@@ -147,7 +143,7 @@ internal fun HomeBrowseCard(
                     Text(
                         text = supportingText,
                         style = MaterialTheme.typography.bodySmall,
-                        color = scheme.onSurfaceVariant,
+                        color = scheme.onSurface,
                         maxLines = 1,
                         overflow = TextOverflow.Ellipsis
                     )

app/src/main/java/hu/bbara/purefin/app/home/ui/nextup/NextUpCard.kt

@@ -37,7 +37,6 @@ internal fun NextUpCard(
     Surface(
         shape = RoundedCornerShape(24.dp),
         color = scheme.surfaceContainer,
-        tonalElevation = 2.dp,
         modifier = modifier.width(256.dp)
     ) {
         Column(
@@ -53,7 +52,7 @@ internal fun NextUpCard(
                 modifier = Modifier
                     .fillMaxWidth()
                     .aspectRatio(16f / 10f)
-                    .background(scheme.surfaceVariant)
+                    .background(scheme.surface)
             ) {
                 PurefinAsyncImage(
                     model = item.episode.heroImageUrl,
@@ -91,7 +90,7 @@ internal fun NextUpCard(
                         .filter { it.isNotBlank() }
                         .joinToString(" • "),
                     style = MaterialTheme.typography.bodySmall,
-                    color = scheme.onSurfaceVariant,
+                    color = scheme.onSurface,
                     maxLines = 1,
                     overflow = TextOverflow.Ellipsis
                 )

app/src/main/java/hu/bbara/purefin/app/home/ui/search/HomeSearchResultCard.kt

@@ -32,7 +32,6 @@ internal fun HomeSearchResultCard(
     Surface(
         shape = RoundedCornerShape(22.dp),
         color = scheme.surfaceContainer,
-        tonalElevation = 2.dp,
         modifier = modifier
             .fillMaxWidth()
             .clip(RoundedCornerShape(22.dp))

app/src/main/java/hu/bbara/purefin/app/home/ui/search/SearchMessage.kt

@@ -28,7 +28,6 @@ internal fun SearchMessage(
         Surface(
             shape = RoundedCornerShape(24.dp),
             color = MaterialTheme.colorScheme.surfaceContainerHigh,
-            tonalElevation = 1.dp,
             modifier = Modifier.fillMaxWidth()
         ) {
             Box(

app/src/main/java/hu/bbara/purefin/app/home/ui/shared/HomeEmptyState.kt

@@ -33,7 +33,6 @@ fun HomeEmptyState(
     Surface(
         shape = RoundedCornerShape(30.dp),
         color = scheme.surfaceContainerLow,
-        tonalElevation = 2.dp,
         modifier = modifier.padding(horizontal = 16.dp)
     ) {
         Column(