Ported progress from SPA and began scaffolding Identity UI.

Laid some groundwork in backend.

Began customizing Identity UI.

Props/Models/User/ApplicationPreferences.cs

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+using System.ComponentModel.DataAnnotations;
+
+namespace Props.Shared.Models.User
+{
+    public class ApplicationPreferences
+    {
+        public int Id { get; set; }
+
+        [Required]
+        public string ApplicationUserId { get; set; }
+
+        public bool EnableSearchHistory { get; set; } = true;
+        public bool DarkMode { get; set; } = false;
+    }
+}

Props/Models/User/ApplicationUser.cs

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+using System;
+using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations;
+using System.Linq;
+using System.Threading.Tasks;
+using Microsoft.AspNetCore.Identity;
+using Props.Shared.Models.User;
+
+namespace Props.Models.User
+{
+    public class ApplicationUser : IdentityUser
+    {
+        [Required]
+        public virtual SearchOutline SearchOutline { get; private set; }
+        [Required]
+        public virtual ResultsPreferences ResultsPreferences { get; private set; }
+
+        [Required]
+        public virtual ApplicationPreferences ApplicationPreferences { get; private set; }
+
+        public ApplicationUser()
+        {
+            SearchOutline = new SearchOutline();
+            ResultsPreferences = new ResultsPreferences();
+            ApplicationPreferences = new ApplicationPreferences();
+        }
+
+        public ApplicationUser(SearchOutline searchOutline, ResultsPreferences resultsPreferences, ApplicationPreferences applicationPreferences)
+        {
+            this.SearchOutline = searchOutline;
+            this.ResultsPreferences = resultsPreferences;
+            this.ApplicationPreferences = applicationPreferences;
+        }
+    }
+}

Props/Models/User/ResultsPreferences.cs

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+using System;
+using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations;
+using System.Linq;
+using System.Text.Json;
+
+namespace Props.Models
+{
+    public class ResultsPreferences
+    {
+        public int Id { get; set; }
+        [Required]
+        public string ApplicationUserId { get; set; }
+
+        [Required]
+        public IList<Category> Order { get; set; }
+
+        public ResultsPreferences()
+        {
+            Order = new List<Category>(Enum.GetValues<Category>().Length);
+            foreach (Category category in Enum.GetValues<Category>())
+            {
+                Order.Add(category);
+            }
+        }
+
+        public enum Category
+        {
+            RatingPriceRatio,
+            Reviews,
+            Purchases,
+            Price,
+        }
+    }
+}

Props/Models/User/SearchOutline.cs

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+using System;
+using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations;
+using System.Linq;
+using Props.Shop.Framework;
+
+namespace Props.Models
+{
+    public class SearchOutline
+    {
+        public int Id { get; set; }
+        [Required]
+        public string ApplicationUserId { get; set; }
+
+        public Filters Filters { get; set; }
+        public int MaxResults { get; set; } = 100;
+
+        [Required]
+        public ShopToggler ShopStates { get; set; } = new ShopToggler();
+
+        public sealed class ShopToggler : HashSet<string>
+        {
+            public int TotalShops { get; set; }
+            public bool this[string name]
+            {
+                get
+                {
+                    return !this.Contains(name);
+                }
+                set
+                {
+                    if (value == false && TotalShops - Count <= 1) return;
+                    if (value)
+                    {
+                        this.Remove(name);
+                    }
+                    else
+                    {
+                        this.Add(name);
+                    }
+                }
+            }
+
+            public ShopToggler Copy()
+            {
+                ShopToggler copy = new ShopToggler();
+                copy.Union(this);
+                return copy;
+            }
+
+            public bool IsShopToggleable(string shop)
+            {
+                return (!Contains(shop) && TotalShops - Count > 1) || Contains(shop);
+            }
+        }
+
+        public override bool Equals(object obj)
+        {
+            if (obj == null || GetType() != obj.GetType())
+            {
+                return false;
+            }
+            SearchOutline other = (SearchOutline)obj;
+            return
+                Id == other.Id &&
+                MaxResults == other.MaxResults &&
+                Filters.Equals(other.Filters) &&
+                ShopStates.Equals(other.ShopStates);
+        }
+
+        public override int GetHashCode()
+        {
+            return Id;
+        }
+    }
+}