Ported progress from SPA and began scaffolding Identity UI.

Laid some groundwork in backend.

Began customizing Identity UI.

Props/Areas/Identity/Pages/Account/ConfirmEmail.cshtml.cs

@@ -0,0 +1,48 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Microsoft.AspNetCore.Authorization;
+using Microsoft.AspNetCore.Identity;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.AspNetCore.Mvc.RazorPages;
+using Microsoft.AspNetCore.WebUtilities;
+using Props.Models;
+using Props.Models.User;
+
+namespace Props.Areas.Identity.Pages.Account
+{
+    [AllowAnonymous]
+    public class ConfirmEmailModel : PageModel
+    {
+        private readonly UserManager<ApplicationUser> _userManager;
+
+        public ConfirmEmailModel(UserManager<ApplicationUser> userManager)
+        {
+            _userManager = userManager;
+        }
+
+        [TempData]
+        public string StatusMessage { get; set; }
+
+        public async Task<IActionResult> OnGetAsync(string userId, string code)
+        {
+            if (userId == null || code == null)
+            {
+                return RedirectToPage("/Index");
+            }
+
+            var user = await _userManager.FindByIdAsync(userId);
+            if (user == null)
+            {
+                return NotFound($"Unable to load user with ID '{userId}'.");
+            }
+
+            code = Encoding.UTF8.GetString(WebEncoders.Base64UrlDecode(code));
+            var result = await _userManager.ConfirmEmailAsync(user, code);
+            StatusMessage = result.Succeeded ? "Thank you for confirming your email." : "Error confirming your email.";
+            return Page();
+        }
+    }
+}