Restore per-row Card size and Spacing as multipliers; drop legacy spacing field

Per-row card size and spacing return to HomeRowSettings, reframed as
percent multipliers that compound with the global Display Size sliders
instead of the old absolute heightDp / spacing values. Display Presets
continue to set absolute heightDp for special cases (Favorite Episode,
Compact, etc.); the multiplier applies on top of whatever base is in
effect for that row.

HomeRowViewOptions:
- Drops the unused absolute `spacing: Int = 16` field.
- Adds `cardSizeMultiplier: Int = 100` and `spacingMultiplier: Int = 100`.
- `heightDp` stays as the per-row absolute set by Display Presets.

resolvedCardHeight() in InterfaceHelpers now layers the multiplier on
top of the existing per-row vs global resolution.

HomeRowSettings exposes Card size and Spacing sliders for each row
(range 50-150, step 5, default 100) under "General". Genre rows keep
their stripped-down options list and skip both. On HomePage, the
per-row spacingMultiplier compounds with the global Spacing slider for
that row's inter-card gap.

app/src/main/java/com/github/damontecres/wholphin/data/model/HomeRowConfig.kt

@@ -217,14 +217,17 @@ data class HomePageSettings(
 const val SUPPORTED_HOME_PAGE_SETTINGS_VERSION = 1
 
 /**
- * View options for displaying a row
+ * View options for displaying a row.
  *
- * Allows for changing things like height or aspect ratio
+ * [heightDp] of `0` means "use the global card size"; a non-zero value is treated as a per-row
+ * absolute override (set by Display Presets). [cardSizeMultiplier] and [spacingMultiplier] are
+ * percents (default 100) applied on top of the global Card size / Spacing sliders for this row.
  */
 @Serializable
 data class HomeRowViewOptions(
     val heightDp: Int = 0,
-    val spacing: Int = 16,
+    val cardSizeMultiplier: Int = 100,
+    val spacingMultiplier: Int = 100,
     val contentScale: PrefContentScale = PrefContentScale.FILL,
     val aspectRatio: AspectRatio = AspectRatio.TALL,
     val imageType: ViewOptionImageType = ViewOptionImageType.PRIMARY,

app/src/main/java/com/github/damontecres/wholphin/ui/main/HomePage.kt

@@ -430,7 +430,11 @@ fun HomePageContent(
                                                     .focusRequester(rowFocusRequesters[rowIndex])
                                                     .animateItem(),
                                             horizontalPadding = BASE_SPACING_DP.dp,
-                                            cardSpacing = LocalInterfaceCustomization.current.spacingDp.dp,
+                                            cardSpacing =
+                                                (
+                                                    LocalInterfaceCustomization.current.spacingDp * viewOptions.spacingMultiplier /
+                                                        100
+                                                ).dp,
                                             cardContent = { index, item, cardModifier, onClick, onLongClick ->
                                                 val onFocus =
                                                     remember(rowIndex, index) {

app/src/main/java/com/github/damontecres/wholphin/ui/main/settings/HomeRowSettings.kt

@@ -102,7 +102,6 @@ fun HomeRowSettings(
                                     onViewOptionsChange.invoke(
                                         viewOptions.copy(
                                             heightDp = Cards.HEIGHT_EPISODE,
-                                            spacing = 20,
                                             imageType = ViewOptionImageType.THUMB,
                                             aspectRatio = AspectRatio.WIDE,
                                             contentScale = PrefContentScale.FIT,
@@ -257,25 +256,28 @@ fun ByParentSortDialogContent(
 }
 
 internal object Options {
-    val ViewOptionsCardHeight =
+    val ViewOptionsCardSize =
         AppSliderPreference<HomeRowViewOptions>(
-            title = R.string.height,
+            title = R.string.card_size,
-            defaultValue = Cards.HEIGHT_2X3_DP.toLong(),
+            defaultValue = 100,
-            min = 64L,
+            min = 50,
-            max = Cards.HEIGHT_2X3_DP + 64L,
+            max = 150,
-            interval = 4,
+            interval = 5,
-            getter = { it.heightDp.toLong() },
+            getter = { it.cardSizeMultiplier.toLong() },
-            setter = { prefs, value -> prefs.copy(heightDp = value.toInt()) },
+            setter = { vo, value -> vo.copy(cardSizeMultiplier = value.toInt()) },
+            summarizer = { it?.let { "$it%" } },
         )
+
     val ViewOptionsSpacing =
         AppSliderPreference<HomeRowViewOptions>(
             title = R.string.spacing,
-            defaultValue = 16,
+            defaultValue = 100,
-            min = 0,
+            min = 50,
-            max = 32,
+            max = 150,
-            interval = 2,
+            interval = 5,
-            getter = { it.spacing.toLong() },
+            getter = { it.spacingMultiplier.toLong() },
-            setter = { prefs, value -> prefs.copy(spacing = value.toInt()) },
+            setter = { vo, value -> vo.copy(spacingMultiplier = value.toInt()) },
+            summarizer = { it?.let { "$it%" } },
         )
 
     val ViewOptionsContentScale =
@@ -395,7 +397,7 @@ internal object Options {
                 title = R.string.general,
                 preferences =
                     listOf(
-                        ViewOptionsCardHeight,
+                        ViewOptionsCardSize,
                         ViewOptionsSpacing,
                         ViewOptionsShowTitles,
                         ViewOptionsImageType,
@@ -421,7 +423,7 @@ internal object Options {
                 title = R.string.general,
                 preferences =
                     listOf(
-                        ViewOptionsCardHeight,
+                        ViewOptionsCardSize,
                         ViewOptionsSpacing,
                         ViewOptionsShowTitles,
                         ViewOptionsImageType,
@@ -455,8 +457,6 @@ internal object Options {
                 title = R.string.general,
                 preferences =
                     listOf(
-                        ViewOptionsCardHeight,
-                        ViewOptionsSpacing,
                         ViewOptionsReset,
                     ),
             ),

app/src/main/java/com/github/damontecres/wholphin/ui/util/InterfaceHelpers.kt

@@ -11,7 +11,8 @@ import com.github.damontecres.wholphin.ui.Cards
 internal fun HomeRowViewOptions.resolvedCardHeight(): Dp {
     val global = LocalInterfaceCustomization.current.cardHeightDp
     val isOverride = heightDp > 0 && heightDp != Cards.HEIGHT_2X3_DP
-    return (if (isOverride) heightDp else global).dp
+    val base = if (isOverride) heightDp else global
+    return (base * cardSizeMultiplier / 100).dp
 }
 
 internal fun Int.withinBoundsOrDefault(preference: AppSliderPreference<*>): Int {