Support HasShadows flag in BuildingComponentsViewModel rendering

[Copilot]

BuildingObjects with the HasShadows flag require special rendering: Part 1 (shadow images 4-7) must render before Part 0 (base images 0-3) so shadows appear below the building.

Changes

• BuildingComponentsViewModel: Added BuildingFlags property and logic to reorder variation parts when HasShadows is set. Swaps first two parts (base and shadow) while preserving remaining parts.

• ImageTableViewModel: Extended constructor to accept and forward BuildingObjectFlags to BuildingComponentsViewModel.

• ObjectEditorViewModel: Extracts building flags from BuildingObject and passes them through the view model chain.

Example

// Without HasShadows: renders parts in order [0, 1, 2]
// With HasShadows: renders parts as [1, 0, 2] - shadows first, then base, then additional parts
if (hasShadows && variation.Count >= minPartsForShadowReordering)
{
    reorderedVariation = [variation[shadowPartIndex], variation[basePartIndex], .. variation.Skip(minPartsForShadowReordering)];
}

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/11.3.1/tools/netstandard2.0/runtimeconfig.json /home/REDACTED/.nuget/packages/avalonia.buildservices/11.3.1/tools/netstandard2.0/Avalonia.BuildServices.Collector.dll (dns block)
  • Triggering command: /usr/share/dotnet/dotnet dotnet exec --runtimeconfig /home/REDACTED/.nuget/packages/avalonia.buildservices/11.3.1/tools/netstandard2.0/runtimeconfig.json /home/REDACTED/.nuget/packages/avalonia.buildservices/11.3.1/tools/netstandard2.0/Avalonia.BuildServices.Collector.dll s/Objects/Building/BuildingComponentsViewModel.cs (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

In the GUI solution there is a set of viewmodels for the BuildingObject, notable BuildingViewModel. It supports viewing the complex structure of the images and variations. One special case that needs to be taken care of is if the BuildingObject it is a viewmodel for has a flag specifically with the "HasShadows" value. If this flag is set, then the rendering of the building should take this into account. If the object has shadows, the first 4 images are the base layer (and only layer) and the second 4 images are the shadows, which should be rendered first/below the base layer

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