Fix root namespaces.

Dashboard.Common/Dashboard.Common.csproj

@@ -4,6 +4,7 @@
         <TargetFramework>net8.0</TargetFramework>
         <ImplicitUsings>enable</ImplicitUsings>
         <Nullable>enable</Nullable>
+        <RootNamespace>Dashboard</RootNamespace>
     </PropertyGroup>
 
 </Project>

Dashboard.Common/HashList.cs

@@ -1,7 +1,7 @@
 using System.Collections;
 using System.Collections.Generic;
 
-namespace Dashboard.Drawing
+namespace Dashboard
 {
     public class HashList<T> : IReadOnlyList<T>
         where T : notnull
@@ -35,4 +35,4 @@ namespace Dashboard.Drawing
         public IEnumerator<T> GetEnumerator() => _list.GetEnumerator();
         IEnumerator IEnumerable.GetEnumerator() => _list.GetEnumerator();
     }
-}
+}