Categorize Nodes ribbon tab into Sources, Reporters, and Processors groups

[Copilot]

All node types were grouped under a single "Drag to canvas" ribbon group, making the toolbox flat and unscannable as more nodes are added.

Changes

• AXAML (MainWindow.axaml): Replaced the single RibbonGroupBox with three labeled groups in the Nodes tab:

  • Sources — Number Producer, Random Number Generator
  • Reporters — Number Reporter
  • Processors — Arithmetic Transform, Pass Filter

  Each group gets its own Gallery wired with the same Loaded="OnNodeGalleryLoaded" handler.

• Code-behind (MainWindow.axaml.cs): OnGalleryPointerPressed previously resolved the selected item via the named NodeGallery control. Switched to sender as ListBox so all three gallery instances correctly capture the dragged node type:

// Before
if (NodeGallery?.SelectedItem is Control selectedItem)

// After — works for any registered gallery
if (sender is ListBox gallery && gallery.SelectedItem is Control selectedItem)

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• av-build-tel-api-v1.avaloniaui.net
  • Triggering command: /usr/share/dotnet/dotnet dotnet exec --runtimeconfig /home/REDACTED/.nuget/packages/avalonia.buildservices/11.3.2/tools/netstandard2.0/runtimeconfig.json /home/REDACTED/.nuget/packages/avalonia.buildservices/11.3.2/tools/netstandard2.0/Avalonia.BuildServices.Collector.dll (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

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This section details on the original issue you should resolve

<issue_title>Categorize Ribbon Toolbox's Nodes</issue_title>
<issue_description>I would like it so the nodes aren't all in the same ribbon group.
Categorize them as such: Sources, Reporters, Processors
There are not many nodes right now, so we may have small categories. But it will make the ribbon more useful</issue_description>

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

• Fixes Categorize Ribbon Toolbox's Nodes #31

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