Fix a few issues found during fine-tuning (#2582)

ming030890

2025-07-04 a750595594321833b48dc19798eed66876a100b4

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using System;
using Microsoft.Maui;
using Microsoft.Maui.Hosting;
 
namespace MauiApp1;
 
class Program : MauiApplication
{
    protected override MauiApp CreateMauiApp() => MauiProgram.CreateMauiApp();
 
    static void Main(string[] args)
    {
        var app = new Program();
        app.Run(args);
    }
}