Bump the ktsu ImGui suite to 3.27.0

Picks up the change to how the force-directed layout measures repulsion: it is
now measured across the clear space between two node bounding boxes rather than
between their centres, so the same setting leaves the same room between a pair
of literals as between a pair of classes instead of crowding the big nodes and
marooning the small ones (ktsu-dev/ImGuiApp#371).

Nothing in Coder needs changing with it. The graph editor takes its physics
from the engine's defaults and the shared PhysicsSettingsPanel rather than
hard-coding any tuned value, so the recalibrated RepulsionStrength - halved
from 1,200,000 to 600,000, because the distance being measured is now the
smaller number - flows through on its own.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_018b2bn5CKSzpjRV4nxv3c3y

Author: claude

Directory.Packages.props

@@ -10,14 +10,14 @@
     <PackageVersion Include="ktsu.Essentials.FileSystemProviders.Native" Version="2.3.2" />
     <PackageVersion Include="ktsu.Essentials.PersistenceProviders.ConfigHome" Version="2.3.2" />
     <PackageVersion Include="ktsu.Essentials.SerializationProviders.Yaml" Version="2.3.2" />
-    <PackageVersion Include="ktsu.ImGui.App" Version="3.26.0" />
+    <PackageVersion Include="ktsu.ImGui.App" Version="3.27.0" />
     <PackageVersion Include="ktsu.UndoRedo.Core" Version="1.0.19" />
-    <PackageVersion Include="ktsu.ImGui.App.Testing" Version="3.26.0" />
-    <PackageVersion Include="ktsu.ImGui.SyntaxHighlighting" Version="3.26.0" />
-    <PackageVersion Include="ktsu.ImGui.Widgets" Version="3.26.0" />
+    <PackageVersion Include="ktsu.ImGui.App.Testing" Version="3.27.0" />
+    <PackageVersion Include="ktsu.ImGui.SyntaxHighlighting" Version="3.27.0" />
+    <PackageVersion Include="ktsu.ImGui.Widgets" Version="3.27.0" />
     <PackageVersion Include="Silk.NET.Windowing.Common" Version="2.23.0" />
-    <PackageVersion Include="ktsu.ImGui.NodeEditor" Version="3.26.0" />
-    <PackageVersion Include="ktsu.ForceDirectedLayout" Version="3.26.0" />
+    <PackageVersion Include="ktsu.ImGui.NodeEditor" Version="3.27.0" />
+    <PackageVersion Include="ktsu.ForceDirectedLayout" Version="3.27.0" />
     <PackageVersion Include="ktsu.CodeBlocker" Version="2.0.4" />
     <PackageVersion Include="ktsu.DeepClone" Version="2.0.2" />
     <PackageVersion Include="Microsoft.Extensions.DependencyInjection" Version="10.0.11" />