Persist selected table on tables page

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

@@ -311,6 +311,7 @@
 }
 
 @code {
+    private const string SelectedTableStorageKey = "rolemaster.tables.selectedTable";
     private LookupReferenceData? referenceData;
     private CriticalTableDetail? tableDetail;
     private string selectedTableSlug = string.Empty;
@@ -341,6 +342,7 @@
     private int? curatingResultId;
     private CriticalCellEditorModel? curationModel;
     private bool isTableMenuOpen;
+    private bool hasResolvedStoredTableSelection;
     private CriticalTableReference? SelectedTableReference =>
         referenceData?.CriticalTables.FirstOrDefault(item => string.Equals(item.Key, selectedTableSlug, StringComparison.OrdinalIgnoreCase));
 
@@ -372,6 +374,7 @@
     {
         selectedTableSlug = tableSlug;
         isTableMenuOpen = false;
+        await PersistSelectedTableAsync(tableSlug);
         await LoadTableDetailAsync();
     }
 
@@ -412,6 +415,34 @@
 
     protected override async Task OnAfterRenderAsync(bool firstRender)
     {
+        if (!hasResolvedStoredTableSelection && referenceData?.CriticalTables.Count > 0)
+        {
+            try
+            {
+                var storedTableSlug = await JSRuntime.InvokeAsync<string?>("localStorage.getItem", SelectedTableStorageKey);
+                hasResolvedStoredTableSelection = true;
+
+                var resolvedTableSlug = ResolveSelectedTableSlug(storedTableSlug);
+                if (!string.Equals(resolvedTableSlug, selectedTableSlug, StringComparison.OrdinalIgnoreCase))
+                {
+                    selectedTableSlug = resolvedTableSlug;
+                    await LoadTableDetailAsync();
+                    await PersistSelectedTableAsync(selectedTableSlug);
+                    await InvokeAsync(StateHasChanged);
+                    return;
+                }
+
+                if (!string.Equals(storedTableSlug, selectedTableSlug, StringComparison.OrdinalIgnoreCase))
+                {
+                    await PersistSelectedTableAsync(selectedTableSlug);
+                }
+            }
+            catch (InvalidOperationException)
+            {
+                // During prerender localStorage is unavailable. Retry after interactive render.
+            }
+        }
+
         if (tableDetail is null || appliedLayoutVersion == tableLayoutVersion)
         {
             return;
@@ -812,6 +843,25 @@
     private string GetSelectedTableLabel() =>
         SelectedTableReference?.Label ?? "Select a table";
 
+    private string ResolveSelectedTableSlug(string? storedTableSlug)
+    {
+        if (referenceData is null || referenceData.CriticalTables.Count == 0)
+        {
+            return string.Empty;
+        }
+
+        if (!string.IsNullOrWhiteSpace(storedTableSlug) &&
+            referenceData.CriticalTables.Any(item => string.Equals(item.Key, storedTableSlug, StringComparison.OrdinalIgnoreCase)))
+        {
+            return storedTableSlug;
+        }
+
+        return referenceData.CriticalTables.First().Key;
+    }
+
+    private Task PersistSelectedTableAsync(string tableSlug) =>
+        JSRuntime.InvokeVoidAsync("localStorage.setItem", SelectedTableStorageKey, tableSlug).AsTask();
+
     private string GetTableOptionCssClass(CriticalTableReference table)
     {
         var classes = new List<string>();