Add Windows context menu integration for grabbing text from images

[Copilot]

• Understand the codebase and existing functionality
• Create ContextMenuUtilities.cs for Windows context menu integration via registry
• Add "AddToContextMenu" setting in Settings.settings and Settings.Designer.cs
• Add UI toggle for context menu integration in GeneralSettings page
• Add test for context menu registry functionality
• Improve error handling with Debug logging and user-friendly error messages
• Run dependency validation to ensure changes don't break existing functionality
• Run code review and address feedback
• Add Windows 11 modern context menu support for packaged apps via Package.appxmanifest
  • Added uap3:FileTypeAssociation with custom verbs for image files
  • Added "Grab text with Text Grab" verb
  • Added "Open in Grab Frame" verb
• Add "Open in Grab Frame" option for unpackaged apps
  • Added second context menu registry entry for GrabFrame
  • Added --grabframe command line argument support
  • Added GrabFrame constructor that accepts image file path
• Address code review feedback
  • Use explicit HashSet of known flags instead of prefix matching
  • Add debug logging when --grabframe flag is used without valid file
  • Add path validation in GrabFrame constructor
  • Use Path.GetFullPath for reliable path resolution
  • Show user-friendly error messages when image files are not found

Original prompt

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This section details on the original issue you should resolve

<issue_title>Enhancement idea: Grab text from image via context menu</issue_title>
<issue_description>I think it would be useful to have an option to have Text Grab integrate into the Windows context menu so you could right click on an image file and grab the text quickly.</issue_description>

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

@TheJoeFin I like this idea, very simple and quick which is the spirit of Text Grab. I'll look into how much work this would require. @TheJoeFin I have done some initial work on this but it looks like the context menu extension from SharpShell (https://github.com/dwmkerr/sharpshell) does not support .netcore3.1 yet. I'll keep an eye out for other routes or updates to that package.

• Fixes Enhancement idea: Grab text from image via context menu #8

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[TheJoeFin]

@copilot add modern Windows 11 context menu support for packaged apps. Add an option to open image in a Grab Frame

[Copilot]

@copilot add modern Windows 11 context menu support for packaged apps. Add an option to open image in a Grab Frame

Added in commits f93ea39 and dc96e4e:

Windows 11 modern context menu for packaged apps:

• Updated Package.appxmanifest with uap3:FileTypeAssociation extension
• Added two verbs: "Grab text with Text Grab" and "Open in Grab Frame"

"Open in Grab Frame" option:

• For unpackaged apps: Added second registry entry Text-Grab.OpenInGrabFrame with --grabframe flag
• For packaged apps: Added OpenInGrabFrame verb in manifest
• Added --grabframe command line argument support
• Added GrabFrame(string imagePath) constructor to load image files directly

Registry structure (unpackaged):

HKCU\Software\Classes\SystemFileAssociations\.png\shell\
  Text-Grab.GrabText\command = "Text-Grab.exe" "%1"
  Text-Grab.OpenInGrabFrame\command = "Text-Grab.exe" --grabframe "%1"