Add permanent table index rail layout

src/RolemasterDb.App/Components/Tables/TablesIndexRail.razor

@@ -0,0 +1,59 @@
+<section class="tables-index-rail" aria-labelledby="tables-index-heading">
+    <div class="tables-index-rail-header">
+        <h2 id="tables-index-heading" class="tables-index-title">Table Index</h2>
+        <p class="tables-index-copy">Choose a table, then read from the roll band across to the result you need.</p>
+    </div>
+
+    <div class="tables-index-list" role="listbox" aria-label="Critical tables">
+        @foreach (var table in Tables)
+        {
+            <button
+                type="button"
+                role="option"
+                aria-selected="@string.Equals(table.Key, SelectedTableSlug, StringComparison.OrdinalIgnoreCase)"
+                class="table-index-option @GetTableOptionCssClass(table)"
+                @onclick="() => OnSelectTable.InvokeAsync(table.Key)">
+                <span class="table-index-option-copy">
+                    <strong class="table-index-option-title">@table.Label</strong>
+                    <span class="table-index-option-meta">@table.Family</span>
+                </span>
+                <span class="table-index-option-chips">
+                    @if (GetIsPinned(table.Key))
+                    {
+                        <StatusChip Tone="accent">Pinned</StatusChip>
+                    }
+                    <span class="chip">@($"{table.CurationPercentage}%")</span>
+                </span>
+            </button>
+        }
+    </div>
+</section>
+
+@code {
+    [Parameter]
+    public IReadOnlyList<CriticalTableReference> Tables { get; set; } = Array.Empty<CriticalTableReference>();
+
+    [Parameter]
+    public string SelectedTableSlug { get; set; } = string.Empty;
+
+    [Parameter]
+    public Func<string, bool>? IsPinned { get; set; }
+
+    [Parameter]
+    public EventCallback<string> OnSelectTable { get; set; }
+
+    private bool GetIsPinned(string tableSlug) => IsPinned?.Invoke(tableSlug) ?? false;
+
+    private string GetTableOptionCssClass(CriticalTableReference table)
+    {
+        var classes = new List<string>();
+
+        if (string.Equals(table.Key, SelectedTableSlug, StringComparison.OrdinalIgnoreCase))
+        {
+            classes.Add("is-selected");
+        }
+
+        classes.Add(table.CurationPercentage >= 100 ? "is-curated" : "needs-curation");
+        return string.Join(' ', classes);
+    }
+}