feature: images of runners are placed in menu

[VirtualKley]

Hello,

I made a change when creating the menu, now for the runner section the initial position icon is shown as a thumbnail image.

I took into account the change of removing the static in Theme and also placing the icon obtaining the default system theme. I had internal problems when doing the merge, so I pulled from another branch. I will stay tuned for updates.

Best regards,

[Kyome22]

@VirtualKley When using dark mode in the system settings, the context menu is white, so the runner is not visible.

The following tasks are required.

        [STAThread]
        static void Main()
        {
            // Terminate RunCat365 if there's any existing instance.
            using var procMutex = new Mutex(true, "_RUNCAT_MUTEX", out var result);
            if (!result) return;

            try
            {
                ApplicationConfiguration.Initialize();
+               Application.SetColorMode(SystemColorMode.System);
                Application.Run(new RunCat365ApplicationContext());
            }
            finally
            {
                procMutex?.ReleaseMutex();
            }
        }

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
    <OutputType>WinExe</OutputType>
    <TargetFramework>net9.0-windows10.0.26100.0</TargetFramework>
    <Nullable>enable</Nullable>
   ・・・
    <ApplicationManifest>App.manifest</ApplicationManifest>
+   <NoWarn>$(NoWarn);WFO5001</NoWarn>
  </PropertyGroup>

However, I am not sure if this method works on Windows 10.

[Kyome22]

Icons are not necessary for anything other than runners, so let's specialize them.

Suggested change

	private static Image? GetIconImageForMenu(string title)
	{
	Theme systemTheme = GetSystemTheme();
	string prefix = systemTheme.GetString();
	string iconName = $"{prefix}_{title}_0".ToLower();
	var obj = Resources.ResourceManager.GetObject(iconName);
	return obj switch
	{
	Icon icon => icon.ToBitmap(),
	_ => null
	} ?? null;
	}
	private static Bitmap? GetRunnerThumbnailBitmap(Runner runner)
	{
	var systemTheme = GetSystemTheme();
	var iconName = $"{systemTheme.GetString()}_{runner.GetString()}_0".ToLower();
	var obj = Resources.ResourceManager.GetObject(iconName);
	return obj is Icon icon ? icon.ToBitmap() : null;
	}

[Kyome22]

Let's eliminate the possibility of icons other than runner-type icons being applied.

Suggested change

	string entityName = getTitle(value);
	var item = new ToolStripMenuItem(entityName, GetIconImageForMenu(entityName), onClickEvent)
	var entityName = getTitle(value);
	Image? iconImage = value is Runner runner ? GetRunnerThumbnailBitmap(runner) : null;
	var item = new ToolStripMenuItem(entityName, iconImage, onClickEvent)

[Kyome22]

Memo for myself:
Separate from the scope of the pull request, I found several places where var could be used with type inference, so I will deal with those separately.

[VirtualKley]

Hello,

I made the changes, I also left the default theme, used the light theme for the menu icons, and made the requested changes to the image method.

[Kyome22]

LGTM