Merge iOS and Mac app into one

ABS Client/Audiobookshelf swift/Views/LibraryGridView.swift

@@ -0,0 +1,38 @@
+import SwiftUI
+
+struct LibraryGridView: View {
+    let items: [LibraryItem]
+    var onRefresh: (() async -> Void)? = nil
+    var onSelect: (LibraryItem) -> Void
+
+    var body: some View {
+        ScrollView {
+            LazyVGrid(columns: gridColumns, spacing: 8) {
+                ForEach(items) { item in
+                    LibraryItemCell(item: item)
+                        .onTapGesture { onSelect(item) }
+                }
+            }
+            #if os(iOS)
+            .padding(.horizontal, 8)
+            .padding(.vertical, 4)
+            #else
+            .padding(20)
+            #endif
+        }
+        #if os(iOS)
+        .refreshable { await onRefresh?() }
+        #endif
+    }
+
+    private var gridColumns: [GridItem] {
+        #if os(iOS)
+        // 3 equal columns — compact spacing for full height utilization
+        [GridItem(.flexible(), spacing: 8),
+         GridItem(.flexible(), spacing: 8),
+         GridItem(.flexible())]
+        #else
+        [GridItem(.adaptive(minimum: 180), spacing: 20)]
+        #endif
+    }
+}