Add List/Grid layout option for Home sections

Introduces a "Display sections as" picker in Home settings with List and
Grid modes. Grid renders each section as a horizontal shelf of video
cards, defaulting to Grid on tvOS and List on iOS/macOS. Per-platform
defaults are preserved via a platform-specific settings key.

On tvOS the shelf is a focus section so swiping up/down between rows of
different lengths works without getting stuck at the end of a row.

Yattee/Core/Settings/SettingsKey.swift

@@ -63,6 +63,7 @@ enum SettingsKey: String, CaseIterable {
     case homeSectionOrder
     case homeSectionVisibility
     case homeSectionItemsLimit
+    case homeSectionLayout
 
     // Tab Bar (compact size class)
     case tabBarItemOrder
@@ -124,7 +125,7 @@ enum SettingsKey: String, CaseIterable {
         case .preferredQuality, .cellularQuality, .macPlayerMode, .listStyle,
              // Home layout — different UI paradigms per platform
              .homeShortcutOrder, .homeShortcutVisibility, .homeShortcutLayout,
-             .homeSectionOrder, .homeSectionVisibility, .homeSectionItemsLimit,
+             .homeSectionOrder, .homeSectionVisibility, .homeSectionItemsLimit, .homeSectionLayout,
              // Tab bar (compact size class) layout
              .tabBarItemOrder, .tabBarItemVisibility, .tabBarStartupTab,
              // Sidebar layout/selection

Yattee/Core/Settings/SettingsManager+Home.swift

@@ -95,6 +95,21 @@ extension SettingsManager {
         }
     }
 
+    /// Layout mode for home sections (list or grid). Default is list on iOS/macOS, grid on tvOS.
+    var homeSectionLayout: HomeSectionLayout {
+        get {
+            if let cached = _homeSectionLayout { return cached }
+            guard let rawValue = string(for: .homeSectionLayout) else {
+                return HomeSectionLayout.platformDefault
+            }
+            return HomeSectionLayout(rawValue: rawValue) ?? HomeSectionLayout.platformDefault
+        }
+        set {
+            _homeSectionLayout = newValue
+            set(newValue.rawValue, for: .homeSectionLayout)
+        }
+    }
+
     // MARK: - Home Section Settings
 
     /// Ordered list of home sections. Default order is bookmarks, history, downloads.

Yattee/Core/SettingsManager.swift

@@ -107,6 +107,7 @@ final class SettingsManager {
     var _homeSectionOrder: [HomeSectionItem]?
     var _homeSectionVisibility: [HomeSectionItem: Bool]?
     var _homeSectionItemsLimit: Int?
+    var _homeSectionLayout: HomeSectionLayout?
 
     // Tab bar settings (compact size class only - iOS)
     var _tabBarItemOrder: [TabBarItem]?
@@ -446,6 +447,7 @@ final class SettingsManager {
         _homeSectionOrder = nil
         _homeSectionVisibility = nil
         _homeSectionItemsLimit = nil
+        _homeSectionLayout = nil
         _tabBarItemOrder = nil
         _tabBarItemVisibility = nil
         _sidebarMainItemOrder = nil