Initial commit

Services/Session/IUserContextAccessor.cs

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+using SharepointToolbox.Web.Core.Models;
+
+namespace SharepointToolbox.Web.Services.Session;
+
+/// <summary>Scoped per Blazor circuit. Set once on circuit init from auth state.</summary>
+public interface IUserContextAccessor
+{
+    string    Email       { get; }
+    string    DisplayName { get; }
+    UserRole  Role        { get; }
+    bool      IsAuthenticated { get; }
+
+    event Action? Initialized;
+
+    void Initialize(AppUser user);
+}