Initial commit

Services/Session/IUserSessionService.cs

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+using SharepointToolbox.Web.Core.Models;
+
+namespace SharepointToolbox.Web.Services.Session;
+
+/// <summary>
+/// Scoped per Blazor circuit. Holds the active tenant profile for the current user.
+/// All feature pages read the profile from here instead of asking the user per-request.
+/// </summary>
+public interface IUserSessionService
+{
+    TenantProfile? CurrentProfile { get; }
+    bool HasProfile { get; }
+    AppSettings Settings { get; }
+
+    void SetProfile(TenantProfile profile);
+    Task ClearSessionAsync();
+    void UpdateSettings(AppSettings settings);
+    event Action? ProfileChanged;
+}