Add user profile fields and completion prompt

Added `FirstName`, `LastName`, and `Address` fields to `ApplicationUser` for extended user profiles. Updated `Index.razor` to include these fields in the profile form with validation. Introduced `ProfileCompletionService` to check profile completeness and added a prompt in `TopBar.razor` for incomplete profiles.

Created migration `20260518213355_AddUserProfileFields` to update the database schema. Updated `RegistryService` to use new fields for user display names. Registered `ProfileCompletionService` and `DbContextFactory` in `Program.cs`. Styled the profile completion banner in `TopBar.razor.css`.

src/BirthList.Web/Program.cs

@@ -90,6 +90,17 @@ builder.Services.AddDbContext<ApplicationDbContext>(options =>
     options.UseSqlite(connectionString);
 });
 
+builder.Services.AddDbContextFactory<ApplicationDbContext>(options =>
+{
+    if (string.Equals(dataProvider, "SqlServer", StringComparison.OrdinalIgnoreCase))
+    {
+        options.UseSqlServer(connectionString);
+        return;
+    }
+
+    options.UseSqlite(connectionString);
+}, ServiceLifetime.Scoped);
+
 builder.Services.AddDbContext<RegistryDbContext>(options =>
 {
     if (string.Equals(dataProvider, "SqlServer", StringComparison.OrdinalIgnoreCase))
@@ -113,6 +124,7 @@ builder.Services.AddIdentityCore<ApplicationUser>(options =>
 
 builder.Services.AddScoped<SmtpEmailSender>();
 builder.Services.AddScoped<IEmailSender<ApplicationUser>>(serviceProvider => serviceProvider.GetRequiredService<SmtpEmailSender>());
+builder.Services.AddScoped<ProfileCompletionService>();
 
 var app = builder.Build();