Add view for block descriptors.

Aaru.Server/Components/Admin/AdminNavMenu.razor

@@ -8,6 +8,9 @@
                 <NavLink class="nav-link" href="/admin" Match="NavLinkMatch.All">
                     <span aria-hidden="true" class="bi bi-house-door-fill-nav-menu"></span> Dashboard
                 </NavLink>
+                <NavLink class="nav-link" href="/admin/block-descriptors">
+                    Block descriptors
+                </NavLink>
             </div>
             <!-- Add more admin links here -->
         </nav>

Aaru.Server/Components/Admin/Pages/BlockDescriptors/View.razor

@@ -0,0 +1,48 @@
+@page "/admin/block-descriptors"
+@attribute [Authorize]
+@layout AdminLayout
+
+@inject Microsoft.EntityFrameworkCore.IDbContextFactory<DbContext> DbContextFactory
+
+<PageTitle>Block descriptors</PageTitle>
+
+@if(!_initialized)
+{
+    <div class="stats-section">
+        <h1 style="color: red; align-content: center; padding: 2rem">Loading...</h1>
+    </div>
+
+    return;
+}
+
+<table class="table">
+    <thead>
+    <tr>
+        <th>
+            @DisplayNameHelper.GetDisplayName(typeof(BlockDescriptor), nameof(BlockDescriptor.Density))
+        </th>
+        <th>
+            @DisplayNameHelper.GetDisplayName(typeof(BlockDescriptor), nameof(BlockDescriptor.Blocks))
+        </th>
+        <th>
+            @DisplayNameHelper.GetDisplayName(typeof(BlockDescriptor), nameof(BlockDescriptor.BlockLength))
+        </th>
+    </tr>
+    </thead>
+    <tbody>
+    @foreach(BlockDescriptor item in _items)
+    {
+        <tr>
+            <td>
+                @item.Density
+            </td>
+            <td>
+                @item.Blocks
+            </td>
+            <td>
+                @item.BlockLength
+            </td>
+        </tr>
+    }
+    </tbody>
+</table>

Aaru.Server/Components/Admin/Pages/BlockDescriptors/View.razor.cs

@@ -0,0 +1,30 @@
+using Aaru.CommonTypes.Metadata;
+using Microsoft.EntityFrameworkCore;
+using DbContext = Aaru.Server.Database.DbContext;
+
+namespace Aaru.Server.Components.Admin.Pages.BlockDescriptors;
+
+public partial class View
+{
+    bool                  _initialized;
+    List<BlockDescriptor> _items;
+
+    /// <inheritdoc />
+    protected override async Task OnInitializedAsync()
+    {
+        await base.OnInitializedAsync();
+
+        StateHasChanged();
+
+        await using DbContext ctx = await DbContextFactory.CreateDbContextAsync();
+
+        _items = await ctx.BlockDescriptor.OrderBy(b => b.BlockLength)
+                          .ThenBy(b => b.Blocks)
+                          .ThenBy(b => b.Density)
+                          .ToListAsync();
+
+        _initialized = true;
+
+        StateHasChanged();
+    }
+}

Aaru.Server/DisplayNameHelper.cs

@@ -0,0 +1,20 @@
+using System.ComponentModel.DataAnnotations;
+using System.Reflection;
+
+namespace Aaru.Server;
+
+public static class DisplayNameHelper
+{
+    public static string GetDisplayName(Type type, string propertyName)
+    {
+        PropertyInfo? prop = type.GetProperty(propertyName);
+
+        if(prop is null) return propertyName;
+
+        DisplayAttribute? displayAttr = prop.GetCustomAttributes(typeof(DisplayAttribute), true)
+                                            .OfType<DisplayAttribute>()
+                                            .FirstOrDefault();
+
+        return displayAttr?.Name ?? propertyName;
+    }
+}