Fix right-click context menu not appearing on image nodes in Pack Explorer

[Copilot]

Right-clicking an image node in the Pack Explorer showed no context menu (no Delete, Rename, Export options) because the type check used System.Drawing.Image instead of PakImage.

Change

mTreeView_NodeMouseClick had a wrong type in the condition that routes to SetupImageMenu():

// Before — never matches; image nodes are tagged with PakImage, not System.Drawing.Image
else if (e.Node.Tag is Image)

// After
else if (e.Node.Tag is PakImage)

GetImageNode sets inode.Tag = image where image is a PakImage. The rest of the file (KeyDown, NodeMouseDoubleClick) already used PakImage correctly; this one branch was the outlier causing the regression.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Deleting images in dropdown menu no longer possible</issue_title>
<issue_description>From direct e-mail sent to me:

I wanted to report a bug in Peggle Edit 5.1.1. In the Images folder, the dropdown menu that allowed deleting mistakenly uploaded images is no longer available.
This feature was present and working correctly in version 5.1.0.
It would be very helpful if this functionality could be restored, as it is essential for managing images in the project.</issue_description>

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

• Fixes Deleting images in dropdown menu no longer possible #31

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