Prefer dedicated GPU

src/main.zig

@@ -16,7 +16,10 @@ app_timer: core.Timer,
 title_timer: core.Timer,
 
 pub fn init(app: *App) !void {
-    try core.init(.{});
+    try core.init(.{
+        // Request high performance = prefer dedicated GPU when available.
+        .power_preference = .high_performance,
+    });
 
     // Set up a "general purpose allocator" that will handle allocations for
     // the lifetime of the application, for which a more specific allocation