chore: release v2.4

- Add theme system (Dark/Light palettes, ModernTheme, ThemeManager)
- Add InputDialog, Spinner common view
- Add DuplicatesCsvExportService
- Refresh views, dialogs, and view models across tabs
- Update localization strings (en/fr)
- Tweak services (transfer, permissions, search, user access, ownership elevation, bulk operations)

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

SharepointToolbox/Services/SharePointGroupResolver.cs

@@ -45,10 +45,37 @@ public class SharePointGroupResolver : ISharePointGroupResolver
 
         GraphServiceClient? graphClient = null;
 
+        // Preload the web's SiteGroups catalog once, so we can skip missing
+        // groups without triggering a server round-trip per name (which fills
+        // logs with "Could not resolve SP group" warnings for groups that
+        // live on other sites or were renamed/deleted).
+        var groupTitles = new HashSet<string>(StringComparer.OrdinalIgnoreCase);
+        try
+        {
+            ctx.Load(ctx.Web.SiteGroups, gs => gs.Include(g => g.Title));
+            await ExecuteQueryRetryHelper.ExecuteQueryRetryAsync(ctx, null, ct);
+            foreach (var g in ctx.Web.SiteGroups)
+                groupTitles.Add(g.Title);
+        }
+        catch (Exception ex)
+        {
+            Log.Warning("Could not enumerate SiteGroups on {Url}: {Error}", ctx.Url, ex.Message);
+        }
+
         foreach (var groupName in groupNames.Distinct(StringComparer.OrdinalIgnoreCase))
         {
             ct.ThrowIfCancellationRequested();
 
+            if (!groupTitles.Contains(groupName))
+            {
+                // Group not on this web — likely scoped to another site in a
+                // multi-site scan. Keep quiet: log at Debug, return empty.
+                Log.Debug("SP group '{Group}' not present on {Url}; skipping.",
+                    groupName, ctx.Url);
+                result[groupName] = Array.Empty<ResolvedMember>();
+                continue;
+            }
+
             try
             {
                 var group = ctx.Web.SiteGroups.GetByName(groupName);