Add hosted lasso pointer mode actions

[ExplodingUFO]

Summary

• Add hosted pointer-mode action descriptors for marquee and lasso selection that set NodeCanvas.SelectionMode without adding a runtime command route.
• Project those actions into the hosted Authoring Tools chrome as Marquee Selection and Lasso Selection buttons.
• Update public API baseline/inventory and Phase 537 parity/recipe docs in both locales.

Closes #197

Test Plan

• dotnet test tests\AsterGraph.Editor.Tests\AsterGraph.Editor.Tests.csproj -c Release --filter "FullyQualifiedName~HostedActions_PointerModeActionsSwitchNodeCanvasSelectionModeWithoutRuntimeCommandRoute|FullyQualifiedName~AuthoringToolsChrome_ProjectsPointerModeActionsThroughNodeCanvasSelectionMode" --verbosity minimal
• dotnet test tests\AsterGraph.Demo.Tests\AsterGraph.Demo.Tests.csproj -c Release --verbosity minimal
• .\eng\validate-public-api-surface.ps1 -Configuration Release -Framework net9.0
• dotnet build AsterGraph.sln -c Release --no-restore --verbosity minimal
• git diff --check