Add plugin to block .insv files for Insta360Studio compatibility

[Copilot]

Insta360Studio ships its own QuickLook with identical name and activation. When both are installed, pressing space on .insv files triggers both applications simultaneously.

Changes

• New plugin: QuickLook.Plugin.InsvBlocker
  • Priority: int.MaxValue (highest, evaluated first)
  • Returns true for .insv extension in CanHandle()
  • Closes window immediately in View() before becoming visible
  • Allows Insta360Studio's QuickLook to handle the file exclusively

Implementation

public class Plugin : IViewer
{
    public int Priority => int.MaxValue;

    public bool CanHandle(string path)
    {
        return path.EndsWith(".insv", StringComparison.OrdinalIgnoreCase);
    }

    public void View(string path, ContextObject context)
    {
        context.ViewerContent = new TextBlock { Visibility = Visibility.Collapsed };
        context.IsBusy = false;
        
        Application.Current?.Dispatcher?.BeginInvoke(new Action(() =>
        {
            (context.Source as Window)?.Close();
        }), DispatcherPriority.Send);
    }
}

Plugin claims the file with highest priority but immediately closes, preventing UI display while allowing Insta360's handler to proceed.

Warning

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Original prompt

---

This section details on the original issue you should resolve

<issue_title>QuickLook与insta360Studio专用的QuickLook（两者同名）的兼容性问题</issue_title>
<issue_description>insta360Studio近期发布了其专用的QuickLook：

两者名称、启动方式完全一样。
对于.insv文件（全景视频文件）按空格后会出现两个QuickLook窗口，其中insta360自身的效果更好。
QuickLook有没有办法支持到这种效果，或者有什么办法排除.insv文件？</issue_description>

<agent_instructions>创建一个新的插件，用于屏蔽.insv后缀的文件</agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes QuickLook与insta360Studio专用的QuickLook（两者同名）的兼容性问题 #1802

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