Fixed Kiota CVE : pinned 1.17.1 → 1.22.2

SharepointToolbox.Tests/Services/Export/CsvExportServiceTests.cs

@@ -48,6 +48,54 @@ public class CsvExportServiceTests
         Assert.Contains("Object", csv);
     }
 
+    [Fact]
+    public void BuildCsv_WithResolvedTarget_IncludesTargetColumns()
+    {
+        var entry = new PermissionEntry(
+            ObjectType: "Site",
+            Title: "HR",
+            Url: "https://contoso.sharepoint.com/sites/HR",
+            HasUniquePermissions: true,
+            Users: "Limited Access System Group For List b20e3b22-2b09-4c99-9ba4-37b42f3a12dc",
+            UserLogins: "Limited Access System Group For List b20e3b22-2b09-4c99-9ba4-37b42f3a12dc",
+            PermissionLevels: "Limited Access: Edit",
+            GrantedThrough: "SharePoint Group: Limited Access System Group For List b20e3b22-2b09-4c99-9ba4-37b42f3a12dc",
+            PrincipalType: "SharePointGroup",
+            TargetUrl: "https://contoso.sharepoint.com/sites/HR/Lists/Payroll",
+            TargetLabel: "Payroll");
+
+        var svc = new CsvExportService();
+        var csv = svc.BuildCsv(new[] { entry });
+
+        Assert.Contains("TargetLabel", csv);
+        Assert.Contains("TargetUrl", csv);
+        Assert.Contains("Payroll", csv);
+        Assert.Contains("https://contoso.sharepoint.com/sites/HR/Lists/Payroll", csv);
+    }
+
+    [Fact]
+    public void BuildCsv_WithSharingLink_IncludesLinkType()
+    {
+        var entry = new PermissionEntry(
+            ObjectType: "Folder", Title: "Reports", Url: "https://contoso.sharepoint.com/sites/HR/Docs",
+            HasUniquePermissions: true,
+            Users: "SharingLinks.e686221e-d1cb-43c5-8c68-04aa7f90f329.OrganizationEdit.64c27910-66ea-421d-b0f0-8f0f72dcfaf6",
+            UserLogins: "SharingLinks.e686221e-d1cb-43c5-8c68-04aa7f90f329.OrganizationEdit.64c27910-66ea-421d-b0f0-8f0f72dcfaf6",
+            PermissionLevels: "Contribute",
+            GrantedThrough: "SharePoint Group: SharingLinks.e686221e-d1cb-43c5-8c68-04aa7f90f329.OrganizationEdit.64c27910-66ea-421d-b0f0-8f0f72dcfaf6",
+            PrincipalType: "SharePointGroup",
+            TargetUrl: "https://contoso.sharepoint.com/sites/HR/Docs/Q4.xlsx",
+            TargetLabel: "Q4.xlsx",
+            SharingLinkType: "OrganizationEdit");
+
+        var svc = new CsvExportService();
+        var csv = svc.BuildCsv(new[] { entry });
+
+        Assert.Contains("SharingLinkType", csv);
+        Assert.Contains("OrganizationEdit", csv);
+        Assert.Contains("Q4.xlsx", csv);
+    }
+
     [Fact]
     public void BuildCsv_WithDuplicateUserPermissionGrantedThrough_MergesLocations()
     {

SharepointToolbox.Tests/Services/Export/HtmlExportServiceTests.cs

@@ -156,6 +156,146 @@ public class HtmlExportServiceTests
         Assert.Contains("getAttribute('data-group-target')", html);
     }
 
+    // ── System-group target rendering (Limited Access / SharingLinks) ────────
+
+    [Fact]
+    public void BuildHtml_WithResolvedListTarget_RendersClickableLink()
+    {
+        var entry = new PermissionEntry(
+            ObjectType: "Site",
+            Title: "Contoso HR",
+            Url: "https://contoso.sharepoint.com/sites/HR",
+            HasUniquePermissions: true,
+            Users: "Limited Access System Group For List b20e3b22-2b09-4c99-9ba4-37b42f3a12dc",
+            UserLogins: "Limited Access System Group For List b20e3b22-2b09-4c99-9ba4-37b42f3a12dc",
+            PermissionLevels: "Limited Access: Edit",
+            GrantedThrough: "SharePoint Group: Limited Access System Group For List b20e3b22-2b09-4c99-9ba4-37b42f3a12dc",
+            PrincipalType: "SharePointGroup",
+            TargetUrl: "https://contoso.sharepoint.com/sites/HR/Lists/Payroll",
+            TargetLabel: "Payroll");
+
+        var svc = new HtmlExportService();
+        var html = svc.BuildHtml(new[] { entry });
+
+        Assert.Contains("https://contoso.sharepoint.com/sites/HR/Lists/Payroll", html);
+        Assert.Contains(">Payroll</a>", html);
+    }
+
+    [Fact]
+    public void BuildHtml_WithSharingLinkTarget_RendersLinkTypeBadgeAndTarget()
+    {
+        var entry = new PermissionEntry(
+            ObjectType: "Folder",
+            Title: "Reports",
+            Url: "https://contoso.sharepoint.com/sites/HR/Shared%20Documents/Reports",
+            HasUniquePermissions: true,
+            Users: "SharingLinks.e686221e-d1cb-43c5-8c68-04aa7f90f329.OrganizationEdit.64c27910-66ea-421d-b0f0-8f0f72dcfaf6",
+            UserLogins: "SharingLinks.e686221e-d1cb-43c5-8c68-04aa7f90f329.OrganizationEdit.64c27910-66ea-421d-b0f0-8f0f72dcfaf6",
+            PermissionLevels: "Contribute",
+            GrantedThrough: "SharePoint Group: SharingLinks.e686221e-d1cb-43c5-8c68-04aa7f90f329.OrganizationEdit.64c27910-66ea-421d-b0f0-8f0f72dcfaf6",
+            PrincipalType: "SharePointGroup",
+            TargetUrl: "https://contoso.sharepoint.com/sites/HR/Shared%20Documents/Reports/Q4.xlsx",
+            TargetLabel: "Q4.xlsx",
+            SharingLinkType: "OrganizationEdit");
+
+        var svc = new HtmlExportService();
+        var html = svc.BuildHtml(new[] { entry });
+
+        // Friendly label, raw code preserved as tooltip
+        Assert.Contains("Org link", html);
+        Assert.Contains("Edit", html);
+        Assert.Contains("title=\"OrganizationEdit\"", html);
+        Assert.Contains("Q4.xlsx", html);
+        Assert.Contains("https://contoso.sharepoint.com/sites/HR/Shared%20Documents/Reports/Q4.xlsx", html);
+    }
+
+    [Theory]
+    [InlineData("OrganizationView", "Org link", "View")]
+    [InlineData("AnonymousEdit",    "Anyone",   "Edit")]
+    [InlineData("Direct",           "Specific people", null)]
+    [InlineData("Flexible",         "Custom link",     null)]
+    public void BuildHtml_FriendlyLinkLabel_ReplacesRawType(string raw, string expectedPart, string? expectedSecond)
+    {
+        var entry = new PermissionEntry(
+            ObjectType: "File", Title: "Doc.docx",
+            Url: "https://contoso.sharepoint.com/sites/HR/Docs/Doc.docx",
+            HasUniquePermissions: true,
+            Users: $"SharingLinks.e686221e-d1cb-43c5-8c68-04aa7f90f329.{raw}.64c27910-66ea-421d-b0f0-8f0f72dcfaf6",
+            UserLogins: $"SharingLinks.e686221e-d1cb-43c5-8c68-04aa7f90f329.{raw}.64c27910-66ea-421d-b0f0-8f0f72dcfaf6",
+            PermissionLevels: "Contribute",
+            GrantedThrough: $"SharePoint Group: SharingLinks.e686221e-d1cb-43c5-8c68-04aa7f90f329.{raw}.64c27910-66ea-421d-b0f0-8f0f72dcfaf6",
+            PrincipalType: "SharePointGroup",
+            TargetUrl: "https://contoso.sharepoint.com/sites/HR/Docs/Doc.docx",
+            TargetLabel: "Doc.docx",
+            SharingLinkType: raw);
+
+        var svc = new HtmlExportService();
+        var html = svc.BuildHtml(new[] { entry }, null, null, hideSystemGroupRaw: true);
+
+        Assert.Contains(expectedPart, html);
+        if (expectedSecond is not null)
+            Assert.Contains(expectedSecond, html);
+        Assert.Contains($"title=\"{raw}\"", html);
+    }
+
+    [Fact]
+    public void BuildHtml_WithSharingLinkAndHideRaw_OmitsRawGroupString()
+    {
+        var entry = new PermissionEntry(
+            ObjectType: "File", Title: "Q4.xlsx",
+            Url: "https://contoso.sharepoint.com/sites/HR/Docs/Q4.xlsx",
+            HasUniquePermissions: true,
+            Users: "SharingLinks.e686221e-d1cb-43c5-8c68-04aa7f90f329.OrganizationEdit.64c27910-66ea-421d-b0f0-8f0f72dcfaf6",
+            UserLogins: "SharingLinks.e686221e-d1cb-43c5-8c68-04aa7f90f329.OrganizationEdit.64c27910-66ea-421d-b0f0-8f0f72dcfaf6",
+            PermissionLevels: "Contribute",
+            GrantedThrough: "SharePoint Group: SharingLinks.e686221e-d1cb-43c5-8c68-04aa7f90f329.OrganizationEdit.64c27910-66ea-421d-b0f0-8f0f72dcfaf6",
+            PrincipalType: "SharePointGroup",
+            TargetUrl: "https://contoso.sharepoint.com/sites/HR/Docs/Q4.xlsx",
+            TargetLabel: "Q4.xlsx",
+            SharingLinkType: "OrganizationEdit");
+
+        var svc = new HtmlExportService();
+        var html = svc.BuildHtml(new[] { entry }, null, null, hideSystemGroupRaw: true);
+
+        // Raw "SharingLinks.{guid}..." text suppressed when target resolved + flag on
+        Assert.DoesNotContain("SharingLinks.e686221e", html);
+        // Target link still rendered
+        Assert.Contains("Q4.xlsx", html);
+        Assert.Contains("OrganizationEdit", html);
+    }
+
+    [Fact]
+    public void BuildHtml_WithSharingLinkButNoTargetAndHideRaw_KeepsRawAsFallback()
+    {
+        // Target resolution failed (deleted item) — flag on, but no TargetUrl → keep raw text.
+        var entry = new PermissionEntry(
+            ObjectType: "File", Title: "Q4.xlsx",
+            Url: "https://contoso.sharepoint.com/sites/HR/Docs/Q4.xlsx",
+            HasUniquePermissions: true,
+            Users: "SharingLinks.e686221e-d1cb-43c5-8c68-04aa7f90f329.OrganizationEdit.64c27910-66ea-421d-b0f0-8f0f72dcfaf6",
+            UserLogins: "SharingLinks.e686221e-d1cb-43c5-8c68-04aa7f90f329.OrganizationEdit.64c27910-66ea-421d-b0f0-8f0f72dcfaf6",
+            PermissionLevels: "Contribute",
+            GrantedThrough: "SharePoint Group: SharingLinks.e686221e-d1cb-43c5-8c68-04aa7f90f329.OrganizationEdit.64c27910-66ea-421d-b0f0-8f0f72dcfaf6",
+            PrincipalType: "SharePointGroup",
+            SharingLinkType: "OrganizationEdit");
+
+        var svc = new HtmlExportService();
+        var html = svc.BuildHtml(new[] { entry }, null, null, hideSystemGroupRaw: true);
+
+        Assert.Contains("SharingLinks.e686221e", html);
+    }
+
+    [Fact]
+    public void BuildHtml_WithoutTarget_RendersGrantedThroughTextOnly()
+    {
+        // Standard SP group with no resolved target — no extra link should appear.
+        var entry = MakeEntry("Owners", "ownersgroup", principalType: "SharePointGroup");
+        var svc = new HtmlExportService();
+        var html = svc.BuildHtml(new[] { entry });
+
+        Assert.DoesNotContain("&rarr;", html);
+    }
+
     [Fact]
     public void BuildHtml_Simplified_WithGroupMembers_RendersExpandablePill()
     {

SharepointToolbox.Tests/Services/Export/UserAccessCsvExportServiceTests.cs

@@ -86,20 +86,15 @@ public class UserAccessCsvExportServiceTests
         var svc = new UserAccessCsvExportService();
         var csv = svc.BuildCsv("Alice", "alice@contoso.com", new[] { DefaultEntry });
 
-        // Find the header row and count its quoted comma-separated fields
-        // Header is: "Site","Object Type","Object","URL","Permission Level","Access Type","Granted Through"
-        // That is 7 fields.
+        // Header: Site, Object Type, Object, URL, Permission Level, Access Type,
+        // Granted Through, TargetLabel, TargetUrl, SharingLinkType → 10 fields.
         var lines = csv.Split('\n', StringSplitOptions.RemoveEmptyEntries);
 
-        // Find a data row (after the blank line separating summary from data)
-        // Data rows contain the entry content (not the header line itself)
-        // We want to count fields in the header row:
         var headerLine = lines.FirstOrDefault(l => l.Contains("\"Site\",\"Object Type\""));
         Assert.NotNull(headerLine);
 
-        // Count comma-separated quoted fields: split by "," boundary
         var fields = CountCsvFields(headerLine!);
-        Assert.Equal(7, fields);
+        Assert.Equal(10, fields);
     }
 
     // ── Test 5: WriteSingleFileAsync includes entries for all users ───────────
@@ -190,8 +185,8 @@ public class UserAccessCsvExportServiceTests
             await svc.WriteSingleFileAsync(entries, tmpFile, CancellationToken.None, mergePermissions: true);
             var content = await File.ReadAllTextAsync(tmpFile);
 
-            // Header must contain consolidated columns
-            Assert.Contains("\"User\",\"User Login\",\"Permission Level\",\"Access Type\",\"Granted Through\",\"Locations\",\"Location Count\"", content);
+            // Header must contain consolidated columns (now includes Target* + SharingLinkType)
+            Assert.Contains("\"User\",\"User Login\",\"Permission Level\",\"Access Type\",\"Granted Through\",\"TargetLabel\",\"TargetUrl\",\"SharingLinkType\",\"Locations\",\"Location Count\"", content);
 
             // Alice's two entries merged — locations column contains both site titles
             Assert.Contains("Contoso", content);

SharepointToolbox.Tests/Services/PermissionEntryClassificationTests.cs

@@ -3,7 +3,8 @@ using SharepointToolbox.Core.Helpers;
 namespace SharepointToolbox.Tests.Services;
 
 /// <summary>
-/// Tests for PERM-03: external user detection and permission-level filtering.
+/// Tests for PERM-03: external user detection, permission-level filtering,
+/// and SharePoint system-group classification (Limited Access / SharingLinks).
 /// Pure static logic — runs immediately without stubs.
 /// </summary>
 public class PermissionEntryClassificationTests
@@ -13,7 +14,6 @@ public class PermissionEntryClassificationTests
     [Fact]
     public void IsExternalUser_WithExtHashInLoginName_ReturnsTrue()
     {
-        // B2B guest login names contain the literal "#EXT#" fragment
         Assert.True(PermissionEntryHelper.IsExternalUser("ext_user_domain.com#EXT#@contoso.onmicrosoft.com"));
     }
 
@@ -28,8 +28,6 @@ public class PermissionEntryClassificationTests
     [Fact]
     public void PermissionEntry_FiltersOutLimitedAccess_WhenOnlyPermissionIsLimitedAccess()
     {
-        // A principal whose sole permission level is "Limited Access" should produce
-        // an empty list after filtering — used to decide whether to include the entry.
         var result = PermissionEntryHelper.FilterPermissionLevels(new[] { "Limited Access" });
         Assert.Empty(result);
     }
@@ -41,23 +39,100 @@ public class PermissionEntryClassificationTests
         Assert.Equal(new[] { "Contribute" }, result);
     }
 
-    // ── IsSharingLinksGroup ────────────────────────────────────────────────────
+    // ── IsBareLimitedAccessSystemGroup ─────────────────────────────────────────
 
     [Fact]
-    public void IsSharingLinksGroup_WithSharingLinksPrefix_ReturnsTrue()
+    public void IsBareLimitedAccessSystemGroup_WithExactMatch_ReturnsTrue()
     {
-        Assert.True(PermissionEntryHelper.IsSharingLinksGroup("SharingLinks.abc123.Edit"));
+        Assert.True(PermissionEntryHelper.IsBareLimitedAccessSystemGroup("Limited Access System Group"));
     }
 
     [Fact]
-    public void IsSharingLinksGroup_WithLimitedAccessSystemGroup_ReturnsTrue()
+    public void IsBareLimitedAccessSystemGroup_WithForWebVariant_ReturnsFalse()
     {
-        Assert.True(PermissionEntryHelper.IsSharingLinksGroup("Limited Access System Group"));
+        // The "For Web {guid}" variant is enriched, not filtered.
+        Assert.False(PermissionEntryHelper.IsBareLimitedAccessSystemGroup(
+            "Limited Access System Group For Web e55a4f7a-b132-4baa-bd96-c63d8dc1fc80"));
     }
 
     [Fact]
-    public void IsSharingLinksGroup_WithNormalGroup_ReturnsFalse()
+    public void IsBareLimitedAccessSystemGroup_WithNormalGroup_ReturnsFalse()
     {
-        Assert.False(PermissionEntryHelper.IsSharingLinksGroup("Owners"));
+        Assert.False(PermissionEntryHelper.IsBareLimitedAccessSystemGroup("Owners"));
+    }
+
+    // ── Classify ───────────────────────────────────────────────────────────────
+
+    [Fact]
+    public void Classify_WithNormalGroupTitle_ReturnsNone()
+    {
+        var c = PermissionEntryHelper.Classify("Site Owners");
+        Assert.Equal(SystemGroupKind.None, c.Kind);
+    }
+
+    [Fact]
+    public void Classify_WithBareLimitedAccess_ReturnsLimitedAccessBare()
+    {
+        var c = PermissionEntryHelper.Classify("Limited Access System Group");
+        Assert.Equal(SystemGroupKind.LimitedAccessBare, c.Kind);
+    }
+
+    [Fact]
+    public void Classify_WithLimitedAccessForWeb_ExtractsWebId()
+    {
+        var c = PermissionEntryHelper.Classify(
+            "Limited Access System Group For Web e55a4f7a-b132-4baa-bd96-c63d8dc1fc80");
+        Assert.Equal(SystemGroupKind.LimitedAccessWeb, c.Kind);
+        Assert.Equal(Guid.Parse("e55a4f7a-b132-4baa-bd96-c63d8dc1fc80"), c.WebId);
+        Assert.Null(c.ListId);
+        Assert.Null(c.ItemUniqueId);
+    }
+
+    [Fact]
+    public void Classify_WithLimitedAccessForList_ExtractsListId()
+    {
+        var c = PermissionEntryHelper.Classify(
+            "Limited Access System Group For List b20e3b22-2b09-4c99-9ba4-37b42f3a12dc");
+        Assert.Equal(SystemGroupKind.LimitedAccessList, c.Kind);
+        Assert.Equal(Guid.Parse("b20e3b22-2b09-4c99-9ba4-37b42f3a12dc"), c.ListId);
+        Assert.Null(c.WebId);
+        Assert.Null(c.ItemUniqueId);
+    }
+
+    [Fact]
+    public void Classify_WithSharingLink_ExtractsItemAndShareId()
+    {
+        var c = PermissionEntryHelper.Classify(
+            "SharingLinks.e686221e-d1cb-43c5-8c68-04aa7f90f329.OrganizationEdit.64c27910-66ea-421d-b0f0-8f0f72dcfaf6");
+        Assert.Equal(SystemGroupKind.SharingLink, c.Kind);
+        Assert.Equal(Guid.Parse("e686221e-d1cb-43c5-8c68-04aa7f90f329"), c.ItemUniqueId);
+        Assert.Equal(Guid.Parse("64c27910-66ea-421d-b0f0-8f0f72dcfaf6"), c.ShareId);
+        Assert.Equal("OrganizationEdit", c.LinkType);
+    }
+
+    [Theory]
+    [InlineData("SharingLinks.e686221e-d1cb-43c5-8c68-04aa7f90f329.AnonymousView.64c27910-66ea-421d-b0f0-8f0f72dcfaf6", "AnonymousView")]
+    [InlineData("SharingLinks.e686221e-d1cb-43c5-8c68-04aa7f90f329.Flexible.64c27910-66ea-421d-b0f0-8f0f72dcfaf6", "Flexible")]
+    [InlineData("SharingLinks.e686221e-d1cb-43c5-8c68-04aa7f90f329.OrganizationView.64c27910-66ea-421d-b0f0-8f0f72dcfaf6", "OrganizationView")]
+    public void Classify_WithVariousSharingLinkTypes_PreservesLinkType(string title, string expected)
+    {
+        var c = PermissionEntryHelper.Classify(title);
+        Assert.Equal(SystemGroupKind.SharingLink, c.Kind);
+        Assert.Equal(expected, c.LinkType);
+    }
+
+    [Fact]
+    public void Classify_WithMalformedSharingLink_ReturnsNone()
+    {
+        // Missing share GUID at the end
+        var c = PermissionEntryHelper.Classify("SharingLinks.e686221e-d1cb-43c5-8c68-04aa7f90f329.Edit");
+        Assert.Equal(SystemGroupKind.None, c.Kind);
+    }
+
+    [Fact]
+    public void Classify_WithEmptyString_ReturnsNone()
+    {
+        var c = PermissionEntryHelper.Classify("");
+        Assert.Equal(SystemGroupKind.None, c.Kind);
     }
 }

SharepointToolbox/App.xaml.cs

@@ -149,6 +149,7 @@ public partial class App : Application
         services.AddTransient<VersionCleanupView>();
 
         // Phase 2: Permissions
+        services.AddTransient<ISystemGroupTargetResolver, SystemGroupTargetResolver>();
         services.AddTransient<IPermissionsService, PermissionsService>();
         services.AddTransient<ISiteListService, SiteListService>();
         services.AddTransient<CsvExportService>();

SharepointToolbox/Core/Helpers/PermissionConsolidator.cs

@@ -50,7 +50,10 @@ public static class PermissionConsolidator
                     first.GrantedThrough,
                     first.IsHighPrivilege,
                     first.IsExternalUser,
-                    locations);
+                    locations,
+                    first.TargetUrl,
+                    first.TargetLabel,
+                    first.SharingLinkType);
             })
             .OrderBy(c => c.UserLogin)
             .ThenBy(c => c.PermissionLevel)

SharepointToolbox/Core/Helpers/PermissionEntryHelper.cs

@@ -1,10 +1,56 @@
+using System.Text.RegularExpressions;
+
 namespace SharepointToolbox.Core.Helpers;
 
+/// <summary>
+/// Classifies a SharePoint group name into one of the known system-group shapes.
+/// </summary>
+public enum SystemGroupKind
+{
+    /// <summary>Not a system group — a normal SharePoint group, user, or external user.</summary>
+    None,
+    /// <summary>Bare "Limited Access System Group" pseudo-principal (no embedded target).</summary>
+    LimitedAccessBare,
+    /// <summary>"Limited Access System Group For Web {webId}".</summary>
+    LimitedAccessWeb,
+    /// <summary>"Limited Access System Group For List {listId}".</summary>
+    LimitedAccessList,
+    /// <summary>"SharingLinks.{itemUniqueId}.{linkType}.{shareId}".</summary>
+    SharingLink
+}
+
+/// <summary>
+/// Result of classifying a SharePoint group name.
+/// Carries the embedded GUIDs / link type so a resolver can look up the target.
+/// </summary>
+public readonly record struct SystemGroupClassification(
+    SystemGroupKind Kind,
+    Guid?  WebId,
+    Guid?  ListId,
+    Guid?  ItemUniqueId,
+    string? LinkType,
+    Guid?  ShareId);
+
 /// <summary>
 /// Pure static helpers for classifying SharePoint permission entries.
 /// </summary>
 public static class PermissionEntryHelper
 {
+    // "Limited Access System Group For Web {guid}"
+    private static readonly Regex LimitedAccessWebRegex = new(
+        @"^Limited Access System Group For Web\s+(?<id>[0-9a-fA-F-]{36})\s*$",
+        RegexOptions.Compiled | RegexOptions.IgnoreCase);
+
+    // "Limited Access System Group For List {guid}"
+    private static readonly Regex LimitedAccessListRegex = new(
+        @"^Limited Access System Group For List\s+(?<id>[0-9a-fA-F-]{36})\s*$",
+        RegexOptions.Compiled | RegexOptions.IgnoreCase);
+
+    // "SharingLinks.{itemUniqueId}.{linkType}.{shareId}"
+    private static readonly Regex SharingLinkRegex = new(
+        @"^SharingLinks\.(?<item>[0-9a-fA-F-]{36})\.(?<type>[^.]+)\.(?<share>[0-9a-fA-F-]{36})\s*$",
+        RegexOptions.Compiled | RegexOptions.IgnoreCase);
+
     /// <summary>
     /// Returns true when the login name is a B2B guest (contains #EXT#).
     /// </summary>
@@ -21,10 +67,45 @@ public static class PermissionEntryHelper
             .ToList();
 
     /// <summary>
-    /// Returns true when the login name represents an internal sharing-link group
-    /// or the "Limited Access System Group" pseudo-principal.
+    /// Returns true when the supplied name/login is the bare "Limited Access System Group"
+    /// pseudo-principal — the noise entry with no embedded GUID. The
+    /// per-Web/List and SharingLinks variants are NOT filtered: they are enriched.
     /// </summary>
-    public static bool IsSharingLinksGroup(string loginName) =>
-        loginName.StartsWith("SharingLinks.", StringComparison.OrdinalIgnoreCase)
-        || loginName.Equals("Limited Access System Group", StringComparison.OrdinalIgnoreCase);
+    public static bool IsBareLimitedAccessSystemGroup(string name) =>
+        name.Equals("Limited Access System Group", StringComparison.OrdinalIgnoreCase);
+
+    /// <summary>
+    /// Classifies a SharePoint group title (the value used in Granted Through). When the
+    /// title matches a known system pattern, the embedded GUIDs / link type are parsed
+    /// out so a resolver can look up the actual targeted Web/List/Item.
+    /// </summary>
+    public static SystemGroupClassification Classify(string groupTitle)
+    {
+        if (string.IsNullOrWhiteSpace(groupTitle))
+            return new SystemGroupClassification(SystemGroupKind.None, null, null, null, null, null);
+
+        var trimmed = groupTitle.Trim();
+
+        if (IsBareLimitedAccessSystemGroup(trimmed))
+            return new SystemGroupClassification(SystemGroupKind.LimitedAccessBare, null, null, null, null, null);
+
+        var mWeb = LimitedAccessWebRegex.Match(trimmed);
+        if (mWeb.Success && Guid.TryParse(mWeb.Groups["id"].Value, out var webId))
+            return new SystemGroupClassification(SystemGroupKind.LimitedAccessWeb, webId, null, null, null, null);
+
+        var mList = LimitedAccessListRegex.Match(trimmed);
+        if (mList.Success && Guid.TryParse(mList.Groups["id"].Value, out var listId))
+            return new SystemGroupClassification(SystemGroupKind.LimitedAccessList, null, listId, null, null, null);
+
+        var mShare = SharingLinkRegex.Match(trimmed);
+        if (mShare.Success
+            && Guid.TryParse(mShare.Groups["item"].Value, out var itemId)
+            && Guid.TryParse(mShare.Groups["share"].Value, out var shareId))
+        {
+            return new SystemGroupClassification(
+                SystemGroupKind.SharingLink, null, null, itemId, mShare.Groups["type"].Value, shareId);
+        }
+
+        return new SystemGroupClassification(SystemGroupKind.None, null, null, null, null, null);
+    }
 }

SharepointToolbox/Core/Helpers/SharingLinkLabels.cs

@@ -0,0 +1,58 @@
+namespace SharepointToolbox.Core.Helpers;
+
+/// <summary>
+/// Risk tier of a SharePoint sharing link, used to color-code the link-type badge
+/// in HTML reports.
+/// </summary>
+public enum SharingLinkRisk
+{
+    Low,     // Read-only, scoped (Org view, Direct, Existing, Review)
+    Medium,  // Org-wide edit
+    High,    // Anonymous (anyone with link, no auth)
+    Unknown  // Unrecognized type — neutral styling
+}
+
+/// <summary>
+/// Maps the raw <c>linkType</c> segment of a <c>SharingLinks.{itemId}.{type}.{shareId}</c>
+/// group name to a human-readable label and a risk tier. The raw codes are SharePoint
+/// internals (OrganizationEdit / AnonymousView / Flexible / …); reports show the friendly
+/// label and tint the badge by tier.
+/// </summary>
+public static class SharingLinkLabels
+{
+    /// <summary>
+    /// Returns the friendly label and risk tier for a sharing-link type code.
+    /// Unknown codes fall through with the raw value and <see cref="SharingLinkRisk.Unknown"/>.
+    /// </summary>
+    public static (string Label, SharingLinkRisk Risk) Describe(string? rawLinkType)
+    {
+        if (string.IsNullOrWhiteSpace(rawLinkType))
+            return (string.Empty, SharingLinkRisk.Unknown);
+
+        return rawLinkType.Trim() switch
+        {
+            "OrganizationView"  => ("Org link · View",       SharingLinkRisk.Low),
+            "OrganizationEdit"  => ("Org link · Edit",       SharingLinkRisk.Medium),
+            "AnonymousView"     => ("Anyone · View",         SharingLinkRisk.High),
+            "AnonymousEdit"     => ("Anyone · Edit",         SharingLinkRisk.High),
+            "Flexible"          => ("Custom link",           SharingLinkRisk.Medium),
+            "Direct"            => ("Specific people",       SharingLinkRisk.Low),
+            "Existing"          => ("Existing access",       SharingLinkRisk.Low),
+            "Review"            => ("Review only",           SharingLinkRisk.Low),
+            "Embed"             => ("Embedded link",         SharingLinkRisk.Medium),
+            _                   => (rawLinkType,             SharingLinkRisk.Unknown)
+        };
+    }
+
+    /// <summary>
+    /// Returns inline-CSS colors (background, foreground) for a risk tier — matches the
+    /// risk-card palette used elsewhere in the HTML reports.
+    /// </summary>
+    public static (string Background, string Foreground) Colors(SharingLinkRisk risk) => risk switch
+    {
+        SharingLinkRisk.Low     => ("#D1FAE5", "#065F46"),
+        SharingLinkRisk.Medium  => ("#FEF3C7", "#92400E"),
+        SharingLinkRisk.High    => ("#FEE2E2", "#991B1B"),
+        _                       => ("#F3F4F6", "#374151"),
+    };
+}

SharepointToolbox/Core/Models/ConsolidatedPermissionEntry.cs

@@ -13,7 +13,10 @@ public record ConsolidatedPermissionEntry(
     string GrantedThrough,
     bool IsHighPrivilege,
     bool IsExternalUser,
-    IReadOnlyList<LocationInfo> Locations
+    IReadOnlyList<LocationInfo> Locations,
+    string? TargetUrl = null,
+    string? TargetLabel = null,
+    string? SharingLinkType = null
 )
 {
     /// <summary>Convenience count — equals Locations.Count.</summary>

SharepointToolbox/Core/Models/PermissionEntry.cs

@@ -14,5 +14,10 @@ public record PermissionEntry(
     string PermissionLevels,    // Semicolon-joined role names (Limited Access already removed)
     string GrantedThrough,      // "Direct Permissions" | "SharePoint Group: <name>"
     string PrincipalType,       // "SharePointGroup" | "User" | "External User"
-    bool   WasAutoElevated = false  // Set to true when site admin was auto-granted to access this entry
+    bool   WasAutoElevated = false, // Set to true when site admin was auto-granted to access this entry
+    // Resolved target for Limited Access System Group For Web/List and SharingLinks
+    // groups — populated when GrantedThrough is one of those system groups, null otherwise.
+    string? TargetUrl = null,
+    string? TargetLabel = null,
+    string? SharingLinkType = null  // OrganizationEdit | OrganizationView | AnonymousEdit | AnonymousView | etc.
 );

SharepointToolbox/Core/Models/SimplifiedPermissionEntry.cs

@@ -41,6 +41,9 @@ public class SimplifiedPermissionEntry
     public string PermissionLevels => Inner.PermissionLevels;
     public string GrantedThrough => Inner.GrantedThrough;
     public string PrincipalType => Inner.PrincipalType;
+    public string? TargetUrl => Inner.TargetUrl;
+    public string? TargetLabel => Inner.TargetLabel;
+    public string? SharingLinkType => Inner.SharingLinkType;
 
     public SimplifiedPermissionEntry(PermissionEntry entry)
     {

SharepointToolbox/Core/Models/SystemGroupTarget.cs

@@ -0,0 +1,15 @@
+using SharepointToolbox.Core.Helpers;
+
+namespace SharepointToolbox.Core.Models;
+
+/// <summary>
+/// Resolved target for a SharePoint system group (Limited Access For Web/List or SharingLinks).
+/// Carries the human-readable label, the navigable URL, and (for sharing links) the link type
+/// so the export layer can render a clickable link in the Granted Through cell.
+/// </summary>
+public record SystemGroupTarget(
+    SystemGroupKind Kind,
+    string Label,            // e.g. "MyList" | "Shared Documents/Folder/File.docx" | "Site - HR"
+    string Url,              // Navigable URL of the targeted resource
+    string? LinkType = null  // For SharingLinks: "OrganizationEdit", "AnonymousView", etc.
+);

SharepointToolbox/Core/Models/UserAccessEntry.cs

@@ -29,5 +29,8 @@ public record UserAccessEntry(
     AccessType AccessType,      // Direct | Group | Inherited
     string GrantedThrough,      // "Direct Permissions" | "SharePoint Group: Members" etc.
     bool IsHighPrivilege,       // True for Full Control, Site Collection Administrator
-    bool IsExternalUser         // True if login contains #EXT#
+    bool IsExternalUser,        // True if login contains #EXT#
+    string? TargetUrl = null,   // Resolved URL when GrantedThrough is a Limited Access / SharingLinks system group
+    string? TargetLabel = null, // Resolved name (list title / file name / web title)
+    string? SharingLinkType = null // OrganizationEdit | OrganizationView | AnonymousEdit | ...
 );

SharepointToolbox/Localization/Strings.fr.resx

@@ -582,6 +582,7 @@ Cette action est irréversible.</value>
   <!-- Phase 16: Report Consolidation Toggle -->
   <data name="audit.grp.export" xml:space="preserve"><value>Options d'exportation</value></data>
   <data name="chk.merge.permissions" xml:space="preserve"><value>Fusionner les permissions en double</value></data>
+  <data name="chk.hide.system.group.raw" xml:space="preserve"><value>Masquer les noms bruts (SharingLinks, Limited Access)</value></data>
   <!-- Phase 19: App Registration & Removal -->
   <data name="profile.register" xml:space="preserve"><value>Enregistrer l'app</value></data>
   <data name="profile.remove" xml:space="preserve"><value>Supprimer l'app</value></data>

SharepointToolbox/Localization/Strings.resx

@@ -582,6 +582,7 @@ This cannot be undone.</value>
   <!-- Phase 16: Report Consolidation Toggle -->
   <data name="audit.grp.export" xml:space="preserve"><value>Export Options</value></data>
   <data name="chk.merge.permissions" xml:space="preserve"><value>Merge duplicate permissions</value></data>
+  <data name="chk.hide.system.group.raw" xml:space="preserve"><value>Hide raw system group names (SharingLinks, Limited Access)</value></data>
   <!-- Phase 19: App Registration & Removal -->
   <data name="profile.register" xml:space="preserve"><value>Register App</value></data>
   <data name="profile.remove" xml:space="preserve"><value>Remove App</value></data>

SharepointToolbox/Services/Export/CsvExportService.cs

@@ -14,7 +14,7 @@ public class CsvExportService
     private static string BuildHeader()
     {
         var T = TranslationSource.Instance;
-        return $"\"{T["report.col.object"]}\",\"{T["report.col.title"]}\",\"{T["report.col.url"]}\",\"HasUniquePermissions\",\"Users\",\"UserLogins\",\"Type\",\"Permissions\",\"GrantedThrough\"";
+        return $"\"{T["report.col.object"]}\",\"{T["report.col.title"]}\",\"{T["report.col.url"]}\",\"HasUniquePermissions\",\"Users\",\"UserLogins\",\"Type\",\"Permissions\",\"GrantedThrough\",\"TargetLabel\",\"TargetUrl\",\"SharingLinkType\"";
     }
 
     /// <summary>
@@ -39,7 +39,10 @@ public class CsvExportService
                 UserLogins    = g.First().UserLogins,
                 PrincipalType = g.First().PrincipalType,
                 Permissions   = g.Key.PermissionLevels,
-                GrantedThrough = g.Key.GrantedThrough
+                GrantedThrough = g.Key.GrantedThrough,
+                TargetLabel   = g.First().TargetLabel ?? string.Empty,
+                TargetUrl     = g.First().TargetUrl ?? string.Empty,
+                SharingLinkType = g.First().SharingLinkType ?? string.Empty
             });
 
         foreach (var row in merged)
@@ -47,7 +50,8 @@ public class CsvExportService
             {
                 Csv(row.ObjectType), Csv(row.Title), Csv(row.Url),
                 Csv(row.HasUnique.ToString()), Csv(row.Users), Csv(row.UserLogins),
-                Csv(row.PrincipalType), Csv(row.Permissions), Csv(row.GrantedThrough)
+                Csv(row.PrincipalType), Csv(row.Permissions), Csv(row.GrantedThrough),
+                Csv(row.TargetLabel), Csv(row.TargetUrl), Csv(row.SharingLinkType)
             }));
 
         return sb.ToString();
@@ -68,7 +72,7 @@ public class CsvExportService
     private static string BuildSimplifiedHeader()
     {
         var T = TranslationSource.Instance;
-        return $"\"{T["report.col.object"]}\",\"{T["report.col.title"]}\",\"{T["report.col.url"]}\",\"HasUniquePermissions\",\"Users\",\"UserLogins\",\"Type\",\"Permissions\",\"SimplifiedLabels\",\"RiskLevel\",\"GrantedThrough\"";
+        return $"\"{T["report.col.object"]}\",\"{T["report.col.title"]}\",\"{T["report.col.url"]}\",\"HasUniquePermissions\",\"Users\",\"UserLogins\",\"Type\",\"Permissions\",\"SimplifiedLabels\",\"RiskLevel\",\"GrantedThrough\",\"TargetLabel\",\"TargetUrl\",\"SharingLinkType\"";
     }
 
     /// <summary>
@@ -95,7 +99,10 @@ public class CsvExportService
                 Permissions    = g.Key.PermissionLevels,
                 SimplifiedLabels = g.First().SimplifiedLabels,
                 RiskLevel      = g.First().RiskLevel.ToString(),
-                GrantedThrough = g.Key.GrantedThrough
+                GrantedThrough = g.Key.GrantedThrough,
+                TargetLabel    = g.First().TargetLabel ?? string.Empty,
+                TargetUrl      = g.First().TargetUrl ?? string.Empty,
+                SharingLinkType = g.First().SharingLinkType ?? string.Empty
             });
 
         foreach (var row in merged)
@@ -104,7 +111,8 @@ public class CsvExportService
                 Csv(row.ObjectType), Csv(row.Title), Csv(row.Url),
                 Csv(row.HasUnique.ToString()), Csv(row.Users), Csv(row.UserLogins),
                 Csv(row.PrincipalType), Csv(row.Permissions), Csv(row.SimplifiedLabels),
-                Csv(row.RiskLevel), Csv(row.GrantedThrough)
+                Csv(row.RiskLevel), Csv(row.GrantedThrough),
+                Csv(row.TargetLabel), Csv(row.TargetUrl), Csv(row.SharingLinkType)
             }));
 
         return sb.ToString();

SharepointToolbox/Services/Export/ExportFileWriter.cs

@@ -24,4 +24,41 @@ internal static class ExportFileWriter
     /// <summary>Writes <paramref name="html"/> to <paramref name="filePath"/> as UTF-8 without BOM.</summary>
     public static Task WriteHtmlAsync(string filePath, string html, CancellationToken ct)
         => File.WriteAllTextAsync(filePath, html, Utf8NoBom, ct);
+
+    /// <summary>
+    /// Streams a <see cref="StringBuilder"/> directly to disk as UTF-8 with
+    /// BOM, chunk by chunk. Avoids the full-document <c>ToString()</c> copy
+    /// and the separate UTF-8 byte buffer that <see cref="File.WriteAllTextAsync(string, string, Encoding, CancellationToken)"/>
+    /// would otherwise allocate — meaningful for large CSV exports.
+    /// </summary>
+    public static Task WriteCsvChunksAsync(string filePath, StringBuilder builder, CancellationToken ct)
+        => WriteChunksAsync(filePath, builder, Utf8WithBom, ct);
+
+    /// <summary>
+    /// Streams a <see cref="StringBuilder"/> directly to disk as UTF-8 without
+    /// BOM. Same rationale as <see cref="WriteCsvChunksAsync"/> — for large
+    /// HTML reports it halves peak memory by skipping the intermediate string.
+    /// </summary>
+    public static Task WriteHtmlChunksAsync(string filePath, StringBuilder builder, CancellationToken ct)
+        => WriteChunksAsync(filePath, builder, Utf8NoBom, ct);
+
+    private static async Task WriteChunksAsync(string filePath, StringBuilder builder, Encoding encoding, CancellationToken ct)
+    {
+        // FileOptions.Asynchronous lets StreamWriter use true async I/O.
+        await using var fs = new FileStream(
+            filePath,
+            FileMode.Create,
+            FileAccess.Write,
+            FileShare.None,
+            bufferSize: 64 * 1024,
+            options: FileOptions.Asynchronous | FileOptions.SequentialScan);
+        await using var sw = new StreamWriter(fs, encoding, bufferSize: 64 * 1024);
+
+        foreach (var chunk in builder.GetChunks())
+        {
+            ct.ThrowIfCancellationRequested();
+            await sw.WriteAsync(chunk, ct);
+        }
+        await sw.FlushAsync(ct);
+    }
 }

SharepointToolbox/Services/Export/HtmlExportService.cs

@@ -27,7 +27,8 @@ public class HtmlExportService
     public string BuildHtml(
         IReadOnlyList<PermissionEntry> entries,
         ReportBranding? branding = null,
-        IReadOnlyDictionary<string, IReadOnlyList<ResolvedMember>>? groupMembers = null)
+        IReadOnlyDictionary<string, IReadOnlyList<ResolvedMember>>? groupMembers = null,
+        bool hideSystemGroupRaw = false)
     {
         var T = TranslationSource.Instance;
         var (totalEntries, uniquePermSets, distinctUsers) = ComputeStats(
@@ -57,7 +58,9 @@ public class HtmlExportService
 
             var (pills, subRows) = BuildUserPillsCell(
                 entry.UserLogins, entry.Users, entry.PrincipalType, groupMembers,
-                colSpan: 7, grpMemIdx: ref grpMemIdx);
+                colSpan: 7, grpMemIdx: ref grpMemIdx,
+                targetLabel: entry.TargetLabel, sharingLinkType: entry.SharingLinkType,
+                hideSystemGroupRaw: hideSystemGroupRaw);
 
             sb.AppendLine("<tr>");
             sb.AppendLine($"  <td><span class=\"{typeCss}\">{HtmlEncode(entry.ObjectType)}</span></td>");
@@ -66,7 +69,7 @@ public class HtmlExportService
             sb.AppendLine($"  <td><span class=\"{uniqueCss}\">{uniqueLbl}</span></td>");
             sb.AppendLine($"  <td>{pills}</td>");
             sb.AppendLine($"  <td>{HtmlEncode(entry.PermissionLevels)}</td>");
-            sb.AppendLine($"  <td>{HtmlEncode(entry.GrantedThrough)}</td>");
+            sb.AppendLine($"  <td>{BuildGrantedThroughCell(entry.GrantedThrough, entry.TargetUrl, entry.TargetLabel, entry.SharingLinkType, hideSystemGroupRaw)}</td>");
             sb.AppendLine("</tr>");
             if (subRows.Length > 0) sb.Append(subRows);
         }
@@ -87,7 +90,8 @@ public class HtmlExportService
     public string BuildHtml(
         IReadOnlyList<SimplifiedPermissionEntry> entries,
         ReportBranding? branding = null,
-        IReadOnlyDictionary<string, IReadOnlyList<ResolvedMember>>? groupMembers = null)
+        IReadOnlyDictionary<string, IReadOnlyList<ResolvedMember>>? groupMembers = null,
+        bool hideSystemGroupRaw = false)
     {
         var T = TranslationSource.Instance;
         var summaries = PermissionSummaryBuilder.Build(entries);
@@ -132,7 +136,9 @@ public class HtmlExportService
 
             var (pills, subRows) = BuildUserPillsCell(
                 entry.UserLogins, entry.Inner.Users, entry.Inner.PrincipalType, groupMembers,
-                colSpan: 9, grpMemIdx: ref grpMemIdx);
+                colSpan: 9, grpMemIdx: ref grpMemIdx,
+                targetLabel: entry.TargetLabel, sharingLinkType: entry.SharingLinkType,
+                hideSystemGroupRaw: hideSystemGroupRaw);
 
             sb.AppendLine("<tr>");
             sb.AppendLine($"  <td><span class=\"{typeCss}\">{HtmlEncode(entry.ObjectType)}</span></td>");
@@ -143,7 +149,7 @@ public class HtmlExportService
             sb.AppendLine($"  <td>{HtmlEncode(entry.PermissionLevels)}</td>");
             sb.AppendLine($"  <td>{HtmlEncode(entry.SimplifiedLabels)}</td>");
             sb.AppendLine($"  <td><span class=\"risk-badge\" style=\"background:{riskBg};color:{riskText};border-color:{riskBorder}\">{HtmlEncode(entry.RiskLevel.ToString())}</span></td>");
-            sb.AppendLine($"  <td>{HtmlEncode(entry.GrantedThrough)}</td>");
+            sb.AppendLine($"  <td>{BuildGrantedThroughCell(entry.GrantedThrough, entry.TargetUrl, entry.TargetLabel, entry.SharingLinkType, hideSystemGroupRaw)}</td>");
             sb.AppendLine("</tr>");
             if (subRows.Length > 0) sb.Append(subRows);
         }
@@ -161,9 +167,10 @@ public class HtmlExportService
         string filePath,
         CancellationToken ct,
         ReportBranding? branding = null,
-        IReadOnlyDictionary<string, IReadOnlyList<ResolvedMember>>? groupMembers = null)
+        IReadOnlyDictionary<string, IReadOnlyList<ResolvedMember>>? groupMembers = null,
+        bool hideSystemGroupRaw = false)
     {
-        var html = BuildHtml(entries, branding, groupMembers);
+        var html = BuildHtml(entries, branding, groupMembers, hideSystemGroupRaw);
         await ExportFileWriter.WriteHtmlAsync(filePath, html, ct);
     }
 
@@ -173,9 +180,10 @@ public class HtmlExportService
         string filePath,
         CancellationToken ct,
         ReportBranding? branding = null,
-        IReadOnlyDictionary<string, IReadOnlyList<ResolvedMember>>? groupMembers = null)
+        IReadOnlyDictionary<string, IReadOnlyList<ResolvedMember>>? groupMembers = null,
+        bool hideSystemGroupRaw = false)
     {
-        var html = BuildHtml(entries, branding, groupMembers);
+        var html = BuildHtml(entries, branding, groupMembers, hideSystemGroupRaw);
         await ExportFileWriter.WriteHtmlAsync(filePath, html, ct);
     }
 
@@ -191,11 +199,12 @@ public class HtmlExportService
         HtmlSplitLayout layout,
         CancellationToken ct,
         ReportBranding? branding = null,
-        IReadOnlyDictionary<string, IReadOnlyList<ResolvedMember>>? groupMembers = null)
+        IReadOnlyDictionary<string, IReadOnlyList<ResolvedMember>>? groupMembers = null,
+        bool hideSystemGroupRaw = false)
     {
         if (splitMode != ReportSplitMode.BySite)
         {
-            await WriteAsync(entries, basePath, ct, branding, groupMembers);
+            await WriteAsync(entries, basePath, ct, branding, groupMembers, hideSystemGroupRaw);
             return;
         }
 
@@ -203,7 +212,7 @@ public class HtmlExportService
         if (layout == HtmlSplitLayout.SingleTabbed)
         {
             var parts = partitions
-                .Select(p => (p.Label, Html: BuildHtml(p.Partition, branding, groupMembers)))
+                .Select(p => (p.Label, Html: BuildHtml(p.Partition, branding, groupMembers, hideSystemGroupRaw)))
                 .ToList();
             var title = TranslationSource.Instance["report.title.permissions"];
             var tabbed = ReportSplitHelper.BuildTabbedHtml(parts, title);
@@ -215,11 +224,11 @@ public class HtmlExportService
         {
             ct.ThrowIfCancellationRequested();
             var path = ReportSplitHelper.BuildPartitionPath(basePath, label);
-            await WriteAsync(partEntries, path, ct, branding, groupMembers);
+            await WriteAsync(partEntries, path, ct, branding, groupMembers, hideSystemGroupRaw);
         }
     }
 
-    /// <summary>Simplified-entry split variant of <see cref="WriteAsync(IReadOnlyList{PermissionEntry}, string, ReportSplitMode, HtmlSplitLayout, CancellationToken, ReportBranding?, IReadOnlyDictionary{string, IReadOnlyList{ResolvedMember}}?)"/>.</summary>
+    /// <summary>Simplified-entry split variant.</summary>
     public async Task WriteAsync(
         IReadOnlyList<SimplifiedPermissionEntry> entries,
         string basePath,
@@ -227,11 +236,12 @@ public class HtmlExportService
         HtmlSplitLayout layout,
         CancellationToken ct,
         ReportBranding? branding = null,
-        IReadOnlyDictionary<string, IReadOnlyList<ResolvedMember>>? groupMembers = null)
+        IReadOnlyDictionary<string, IReadOnlyList<ResolvedMember>>? groupMembers = null,
+        bool hideSystemGroupRaw = false)
     {
         if (splitMode != ReportSplitMode.BySite)
         {
-            await WriteAsync(entries, basePath, ct, branding, groupMembers);
+            await WriteAsync(entries, basePath, ct, branding, groupMembers, hideSystemGroupRaw);
             return;
         }
 
@@ -239,7 +249,7 @@ public class HtmlExportService
         if (layout == HtmlSplitLayout.SingleTabbed)
         {
             var parts = partitions
-                .Select(p => (p.Label, Html: BuildHtml(p.Partition, branding, groupMembers)))
+                .Select(p => (p.Label, Html: BuildHtml(p.Partition, branding, groupMembers, hideSystemGroupRaw)))
                 .ToList();
             var title = TranslationSource.Instance["report.title.permissions_simplified"];
             var tabbed = ReportSplitHelper.BuildTabbedHtml(parts, title);
@@ -251,7 +261,7 @@ public class HtmlExportService
         {
             ct.ThrowIfCancellationRequested();
             var path = ReportSplitHelper.BuildPartitionPath(basePath, label);
-            await WriteAsync(partEntries, path, ct, branding, groupMembers);
+            await WriteAsync(partEntries, path, ct, branding, groupMembers, hideSystemGroupRaw);
         }
     }
 

SharepointToolbox/Services/Export/PermissionHtmlFragments.cs

@@ -1,4 +1,5 @@
 using System.Text;
+using SharepointToolbox.Core.Helpers;
 using SharepointToolbox.Core.Models;
 using SharepointToolbox.Localization;
 
@@ -137,7 +138,10 @@ document.addEventListener('click', function(ev) {
         string? principalType,
         IReadOnlyDictionary<string, IReadOnlyList<ResolvedMember>>? groupMembers,
         int colSpan,
-        ref int grpMemIdx)
+        ref int grpMemIdx,
+        string? targetLabel = null,
+        string? sharingLinkType = null,
+        bool hideSystemGroupRaw = false)
     {
         var T = TranslationSource.Instance;
         var logins = userLogins.Split(';', StringSplitOptions.RemoveEmptyEntries);
@@ -151,14 +155,40 @@ document.addEventListener('click', function(ev) {
             var name  = i < names.Length ? names[i].Trim() : login;
             var isExt = login.Contains("#EXT#", StringComparison.OrdinalIgnoreCase);
 
-            bool isExpandable = principalType == "SharePointGroup"
+            // When the principal is a resolved system group and the user wants the raw
+            // name hidden, replace the pill's visible text with the link-type badge
+            // (sharing links) and/or the target label. Falls back to the raw name when
+            // resolution failed (no targetLabel).
+            var classification = principalType == "SharePointGroup"
+                ? PermissionEntryHelper.Classify(name)
+                : new SystemGroupClassification(SystemGroupKind.None, null, null, null, null, null);
+            bool isResolvedSystemGroup = hideSystemGroupRaw
+                && classification.Kind != SystemGroupKind.None
+                && classification.Kind != SystemGroupKind.LimitedAccessBare
+                && !string.IsNullOrEmpty(targetLabel);
+
+            bool hasResolvedMembers = principalType == "SharePointGroup"
                 && groupMembers != null
                 && groupMembers.TryGetValue(name, out _);
 
-            if (isExpandable && groupMembers != null && groupMembers.TryGetValue(name, out var resolved))
+            if (hasResolvedMembers && groupMembers!.TryGetValue(name, out var resolved))
             {
                 var grpId = $"grpmem{grpMemIdx}";
-                pills.Append($"<span class=\"user-pill group-expandable\" data-group-target=\"{HtmlEncode(grpId)}\" data-email=\"{HtmlEncode(login)}\">{HtmlEncode(name)} &#9660;</span>");
+                pills.Append("<span class=\"user-pill group-expandable\"");
+                if (isResolvedSystemGroup)
+                    pills.Append(" data-system-group=\"1\"");
+                pills.Append($" data-group-target=\"{HtmlEncode(grpId)}\" data-email=\"{HtmlEncode(login)}\">");
+                if (isResolvedSystemGroup)
+                {
+                    if (!string.IsNullOrEmpty(sharingLinkType))
+                        pills.Append(BuildSharingLinkBadge(sharingLinkType!));
+                    pills.Append(HtmlEncode(targetLabel!));
+                }
+                else
+                {
+                    pills.Append(HtmlEncode(name));
+                }
+                pills.Append(" &#9660;</span>");
 
                 string memberContent;
                 if (resolved.Count > 0)
@@ -173,6 +203,14 @@ document.addEventListener('click', function(ev) {
                 subRows.AppendLine($"<tr data-group=\"{HtmlEncode(grpId)}\" style=\"display:none\"><td colspan=\"{colSpan}\" style=\"padding-left:2em;font-size:.8rem;color:#555\">{memberContent}</td></tr>");
                 grpMemIdx++;
             }
+            else if (isResolvedSystemGroup)
+            {
+                pills.Append("<span class=\"user-pill\" data-system-group=\"1\">");
+                if (!string.IsNullOrEmpty(sharingLinkType))
+                    pills.Append(BuildSharingLinkBadge(sharingLinkType!));
+                pills.Append(HtmlEncode(targetLabel!));
+                pills.Append("</span>");
+            }
             else
             {
                 var cls = isExt ? "user-pill external-user" : "user-pill";
@@ -183,6 +221,80 @@ document.addEventListener('click', function(ev) {
         return (pills.ToString(), subRows.ToString());
     }
 
+    /// <summary>
+    /// Renders the Granted Through cell. When the entry carries a resolved system-group
+    /// target (Limited Access For Web/List or SharingLinks), a clickable link to the
+    /// targeted resource is appended on a second line. For sharing links the link type
+    /// (OrganizationEdit / AnonymousView / …) is surfaced alongside the target.
+    ///
+    /// When <paramref name="hideSystemGroupRaw"/> is true and a target was resolved, the
+    /// raw "SharePoint Group: SharingLinks.{guid}…" / "Limited Access System Group For
+    /// Web|List {guid}" prefix is suppressed and only the link-type badge + clickable
+    /// target are shown — keeps the report readable without losing information.
+    /// </summary>
+    internal static string BuildGrantedThroughCell(
+        string grantedThrough,
+        string? targetUrl,
+        string? targetLabel,
+        string? sharingLinkType,
+        bool hideSystemGroupRaw = false)
+    {
+        var hasTarget = !string.IsNullOrEmpty(targetUrl) && !string.IsNullOrEmpty(targetLabel);
+        var hasLinkType = !string.IsNullOrEmpty(sharingLinkType);
+        var suppressRaw = hideSystemGroupRaw && hasTarget;
+
+        var sb = new StringBuilder();
+        if (!suppressRaw)
+            sb.Append(HtmlEncode(grantedThrough));
+
+        if (!hasTarget && !hasLinkType)
+            return sb.ToString();
+
+        if (suppressRaw)
+        {
+            // Inline layout — no leading raw text to wrap under.
+            if (hasLinkType)
+                sb.Append(BuildSharingLinkBadge(sharingLinkType!));
+            if (hasTarget)
+            {
+                sb.Append("<a href=\"");
+                sb.Append(HtmlEncode(targetUrl!));
+                sb.Append("\" target=\"_blank\">");
+                sb.Append(HtmlEncode(targetLabel!));
+                sb.Append("</a>");
+            }
+            return sb.ToString();
+        }
+
+        sb.Append("<div style=\"margin-top:4px;font-size:.75rem;color:#555\">");
+        if (hasLinkType)
+            sb.Append(BuildSharingLinkBadge(sharingLinkType!));
+        if (hasTarget)
+        {
+            sb.Append("&rarr; <a href=\"");
+            sb.Append(HtmlEncode(targetUrl!));
+            sb.Append("\" target=\"_blank\">");
+            sb.Append(HtmlEncode(targetLabel!));
+            sb.Append("</a>");
+        }
+        sb.Append("</div>");
+        return sb.ToString();
+    }
+
+    /// <summary>
+    /// Builds the colored badge for a SharePoint sharing-link type. Translates the
+    /// raw <c>linkType</c> code (e.g. <c>OrganizationEdit</c>) into a human label
+    /// (e.g. <c>Org link · Edit</c>) and tints by risk tier; raw code surfaces as a
+    /// <c>title</c> tooltip so operators can still trace it back to the source.
+    /// </summary>
+    internal static string BuildSharingLinkBadge(string rawLinkType)
+    {
+        var (label, risk) = SharingLinkLabels.Describe(rawLinkType);
+        var (bg, fg) = SharingLinkLabels.Colors(risk);
+        return $"<span class=\"badge\" style=\"background:{bg};color:{fg};margin-right:6px\" " +
+               $"title=\"{HtmlEncode(rawLinkType)}\">{HtmlEncode(label)}</span>";
+    }
+
     /// <summary>Returns the CSS class for the object-type badge.</summary>
     internal static string ObjectTypeCss(string t) => t switch
     {

SharepointToolbox/Services/Export/StorageCsvExportService.cs

@@ -1,5 +1,6 @@
 using SharepointToolbox.Core.Models;
 using SharepointToolbox.Localization;
+using System.Globalization;
 using System.IO;
 using System.Text;
 
@@ -18,34 +19,58 @@ public class StorageCsvExportService
     /// </summary>
     public string BuildCsv(IReadOnlyList<StorageNode> nodes)
     {
-        var T = TranslationSource.Instance;
-        var sb = new StringBuilder();
+        // Pre-size: ~110 chars/row + header avoids most StringBuilder growth.
+        var sb = new StringBuilder(128 + nodes.Count * 110);
+        WriteCsv(sb, nodes);
+        return sb.ToString();
+    }
 
-        // Header
-        sb.AppendLine($"{T["report.col.library"]},{T["stor.col.kind"]},{T["report.col.site"]},{T["report.stat.files"]},{T["report.col.total_size_mb"]},{T["report.col.version_size_mb"]},{T["report.col.last_modified"]}");
+    private static void WriteCsv(StringBuilder sb, IReadOnlyList<StorageNode> nodes)
+    {
+        var T = TranslationSource.Instance;
+        // Hoist resource lookups out of the row loop: ResourceManager.GetString
+        // is a culture-aware dictionary probe — caching once per export saves
+        // O(rows × columns) lookups on large tenants.
+        string colLibrary  = T["report.col.library"];
+        string colKind     = T["stor.col.kind"];
+        string colSite     = T["report.col.site"];
+        string colFiles    = T["report.stat.files"];
+        string colTotalMb  = T["report.col.total_size_mb"];
+        string colVerMb    = T["report.col.version_size_mb"];
+        string colLastMod  = T["report.col.last_modified"];
+
+        sb.Append(colLibrary).Append(',')
+          .Append(colKind).Append(',')
+          .Append(colSite).Append(',')
+          .Append(colFiles).Append(',')
+          .Append(colTotalMb).Append(',')
+          .Append(colVerMb).Append(',')
+          .AppendLine(colLastMod);
+
+        var kindLabels = BuildKindLabelCache();
 
         foreach (var node in nodes)
         {
-            sb.AppendLine(string.Join(",",
-                Csv(node.Name),
-                Csv(KindLabel(node.Kind)),
-                Csv(node.SiteTitle),
-                node.TotalFileCount.ToString(),
-                FormatMb(node.TotalSizeBytes),
-                FormatMb(node.VersionSizeBytes),
-                node.LastModified.HasValue
-                    ? Csv(node.LastModified.Value.ToString("yyyy-MM-dd"))
-                    : string.Empty));
+            AppendCsvField(sb, node.Name).Append(',');
+            AppendCsvField(sb, kindLabels[(int)node.Kind]).Append(',');
+            AppendCsvField(sb, node.SiteTitle).Append(',');
+            sb.Append(node.TotalFileCount).Append(',');
+            AppendMb(sb, node.TotalSizeBytes).Append(',');
+            AppendMb(sb, node.VersionSizeBytes).Append(',');
+            if (node.LastModified.HasValue)
+                AppendCsvField(sb, node.LastModified.Value.ToString("yyyy-MM-dd", CultureInfo.InvariantCulture));
+            sb.AppendLine();
         }
-
-        return sb.ToString();
     }
 
     /// <summary>Writes the library-level CSV to <paramref name="filePath"/> with UTF-8 BOM.</summary>
     public async Task WriteAsync(IReadOnlyList<StorageNode> nodes, string filePath, CancellationToken ct)
     {
-        var csv = BuildCsv(nodes);
-        await ExportFileWriter.WriteCsvAsync(filePath, csv, ct);
+        // Stream straight to disk: skip the StringBuilder→string copy and the
+        // separate UTF-8 buffer that File.WriteAllTextAsync materializes.
+        var sb = new StringBuilder(128 + nodes.Count * 110);
+        WriteCsv(sb, nodes);
+        await ExportFileWriter.WriteCsvChunksAsync(filePath, sb, ct);
     }
 
     /// <summary>
@@ -53,44 +78,68 @@ public class StorageCsvExportService
     /// </summary>
     public string BuildCsv(IReadOnlyList<StorageNode> nodes, IReadOnlyList<FileTypeMetric> fileTypeMetrics)
     {
-        var T = TranslationSource.Instance;
-        var sb = new StringBuilder();
+        var sb = new StringBuilder(192 + nodes.Count * 100 + fileTypeMetrics.Count * 40);
+        WriteCsv(sb, nodes, fileTypeMetrics);
+        return sb.ToString();
+    }
+
+    private static void WriteCsv(StringBuilder sb, IReadOnlyList<StorageNode> nodes, IReadOnlyList<FileTypeMetric> fileTypeMetrics)
+    {
+        var T = TranslationSource.Instance;
+        string colLibrary  = T["report.col.library"];
+        string colSite     = T["report.col.site"];
+        string colFiles    = T["report.stat.files"];
+        string colTotalMb  = T["report.col.total_size_mb"];
+        string colVerMb    = T["report.col.version_size_mb"];
+        string colLastMod  = T["report.col.last_modified"];
+
+        sb.Append(colLibrary).Append(',')
+          .Append(colSite).Append(',')
+          .Append(colFiles).Append(',')
+          .Append(colTotalMb).Append(',')
+          .Append(colVerMb).Append(',')
+          .AppendLine(colLastMod);
 
-        // Library details
-        sb.AppendLine($"{T["report.col.library"]},{T["report.col.site"]},{T["report.stat.files"]},{T["report.col.total_size_mb"]},{T["report.col.version_size_mb"]},{T["report.col.last_modified"]}");
         foreach (var node in nodes)
         {
-            sb.AppendLine(string.Join(",",
-                Csv(node.Name),
-                Csv(node.SiteTitle),
-                node.TotalFileCount.ToString(),
-                FormatMb(node.TotalSizeBytes),
-                FormatMb(node.VersionSizeBytes),
-                node.LastModified.HasValue
-                    ? Csv(node.LastModified.Value.ToString("yyyy-MM-dd"))
-                    : string.Empty));
+            AppendCsvField(sb, node.Name).Append(',');
+            AppendCsvField(sb, node.SiteTitle).Append(',');
+            sb.Append(node.TotalFileCount).Append(',');
+            AppendMb(sb, node.TotalSizeBytes).Append(',');
+            AppendMb(sb, node.VersionSizeBytes).Append(',');
+            if (node.LastModified.HasValue)
+                AppendCsvField(sb, node.LastModified.Value.ToString("yyyy-MM-dd", CultureInfo.InvariantCulture));
+            sb.AppendLine();
         }
 
-        // File type breakdown
         if (fileTypeMetrics.Count > 0)
         {
+            string colFileType = T["report.col.file_type"];
+            string colSizeMb   = T["report.col.size_mb"];
+            string colFileCnt  = T["report.col.file_count"];
+            string noExtLabel  = T["report.text.no_extension"];
+
             sb.AppendLine();
-            sb.AppendLine($"{T["report.col.file_type"]},{T["report.col.size_mb"]},{T["report.col.file_count"]}");
+            sb.Append(colFileType).Append(',')
+              .Append(colSizeMb).Append(',')
+              .AppendLine(colFileCnt);
+
             foreach (var m in fileTypeMetrics)
             {
-                string label = string.IsNullOrEmpty(m.Extension) ? T["report.text.no_extension"] : m.Extension;
-                sb.AppendLine(string.Join(",", Csv(label), FormatMb(m.TotalSizeBytes), m.FileCount.ToString()));
+                string label = string.IsNullOrEmpty(m.Extension) ? noExtLabel : m.Extension;
+                AppendCsvField(sb, label).Append(',');
+                AppendMb(sb, m.TotalSizeBytes).Append(',');
+                sb.Append(m.FileCount).AppendLine();
             }
         }
-
-        return sb.ToString();
     }
 
     /// <summary>Writes the two-section CSV (libraries + file-type breakdown) with UTF-8 BOM.</summary>
     public async Task WriteAsync(IReadOnlyList<StorageNode> nodes, IReadOnlyList<FileTypeMetric> fileTypeMetrics, string filePath, CancellationToken ct)
     {
-        var csv = BuildCsv(nodes, fileTypeMetrics);
-        await ExportFileWriter.WriteCsvAsync(filePath, csv, ct);
+        var sb = new StringBuilder(192 + nodes.Count * 100 + fileTypeMetrics.Count * 40);
+        WriteCsv(sb, nodes, fileTypeMetrics);
+        await ExportFileWriter.WriteCsvChunksAsync(filePath, sb, ct);
     }
 
     /// <summary>
@@ -139,11 +188,27 @@ public class StorageCsvExportService
 
     // ── Helpers ───────────────────────────────────────────────────────────────
 
-    private static string FormatMb(long bytes)
-        => (bytes / (1024.0 * 1024.0)).ToString("F2");
+    private static StringBuilder AppendMb(StringBuilder sb, long bytes)
+        => sb.Append((bytes / (1024.0 * 1024.0)).ToString("F2", CultureInfo.InvariantCulture));
 
-    /// <summary>RFC 4180 CSV field quoting with formula-injection guard.</summary>
-    private static string Csv(string value) => CsvSanitizer.EscapeMinimal(value);
+    private static StringBuilder AppendCsvField(StringBuilder sb, string value)
+        => sb.Append(CsvSanitizer.EscapeMinimal(value));
+
+    /// <summary>
+    /// Pre-resolves localized labels for every <see cref="StorageNodeKind"/>
+    /// once per export, indexed by the enum's int value. Avoids a
+    /// <c>ResourceManager.GetString</c> call per row in hot CSV loops.
+    /// </summary>
+    private static string[] BuildKindLabelCache()
+    {
+        var values = (StorageNodeKind[])Enum.GetValues(typeof(StorageNodeKind));
+        int max = 0;
+        foreach (var v in values) { int i = (int)v; if (i > max) max = i; }
+        var cache = new string[max + 1];
+        for (int i = 0; i < cache.Length; i++) cache[i] = ((StorageNodeKind)i).ToString();
+        foreach (var v in values) cache[(int)v] = KindLabel(v);
+        return cache;
+    }
 
     private static string KindLabel(StorageNodeKind kind)
     {

SharepointToolbox/Services/Export/StorageHtmlExportService.cs

@@ -13,6 +13,8 @@ namespace SharepointToolbox.Services.Export;
 public class StorageHtmlExportService
 {
     private int _togIdx;
+    private string[] _kindLabels = Array.Empty<string>();
+    private string[] _kindLabelsHtml = Array.Empty<string>();
 
     /// <summary>
     /// Builds a self-contained HTML report with one collapsible row per
@@ -21,10 +23,18 @@ public class StorageHtmlExportService
     /// breakdown section is desired.
     /// </summary>
     public string BuildHtml(IReadOnlyList<StorageNode> nodes, ReportBranding? branding = null)
+    {
+        var sb = new StringBuilder(3072 + nodes.Count * 340);
+        BuildHtmlCore(sb, nodes, branding);
+        return sb.ToString();
+    }
+
+    private void BuildHtmlCore(StringBuilder sb, IReadOnlyList<StorageNode> nodes, ReportBranding? branding)
     {
         var T = TranslationSource.Instance;
         _togIdx = 0;
-        var sb = new StringBuilder();
+        _kindLabels = BuildKindLabelCache();
+        _kindLabelsHtml = BuildHtmlEncodedCache(_kindLabels);
 
         sb.AppendLine("<!DOCTYPE html>");
         sb.AppendLine("<html lang=\"en\">");
@@ -60,11 +70,18 @@ public class StorageHtmlExportService
         sb.Append(BrandingHtmlHelper.BuildBrandingHeader(branding));
         sb.AppendLine($"<h1>{T["report.title.storage"]}</h1>");
 
-        // Summary cards
-        var rootNodes0 = nodes.Where(n => n.IndentLevel == 0).ToList();
-        long siteTotal0 = rootNodes0.Sum(n => n.TotalSizeBytes);
-        long versionTotal0 = rootNodes0.Sum(n => n.VersionSizeBytes);
-        long fileTotal0 = rootNodes0.Sum(n => n.TotalFileCount);
+        // Single-pass root aggregation: replaces 4 separate enumerations
+        // (.Where().ToList() + 3× .Sum() + a final .Where() during render).
+        var rootNodes0 = new List<StorageNode>(Math.Min(nodes.Count, 64));
+        long siteTotal0 = 0, versionTotal0 = 0, fileTotal0 = 0;
+        foreach (var n in nodes)
+        {
+            if (n.IndentLevel != 0) continue;
+            rootNodes0.Add(n);
+            siteTotal0    += n.TotalSizeBytes;
+            versionTotal0 += n.VersionSizeBytes;
+            fileTotal0    += n.TotalFileCount;
+        }
 
         sb.AppendLine($"""
             <div style="display:flex;gap:16px;margin:16px 0;flex-wrap:wrap">
@@ -90,7 +107,10 @@ public class StorageHtmlExportService
               <tbody>
             """);
 
-        foreach (var node in nodes)
+        // Render only the pre-materialized root list — recursing into
+        // Children handles descendants. Iterating the flat list would render
+        // every descendant a second time as a top-level row.
+        foreach (var node in rootNodes0)
         {
             RenderNode(sb, node);
         }
@@ -102,18 +122,24 @@ public class StorageHtmlExportService
 
         sb.AppendLine($"<p class=\"generated\">{T["report.text.generated_colon"]} {DateTime.Now:yyyy-MM-dd HH:mm}</p>");
         sb.AppendLine("</body></html>");
-
-        return sb.ToString();
     }
 
     /// <summary>
     /// Builds an HTML report including a file-type breakdown chart section.
     /// </summary>
     public string BuildHtml(IReadOnlyList<StorageNode> nodes, IReadOnlyList<FileTypeMetric> fileTypeMetrics, ReportBranding? branding = null)
+    {
+        var sb = new StringBuilder(4096 + nodes.Count * 340 + fileTypeMetrics.Count * 220);
+        BuildHtmlCore(sb, nodes, fileTypeMetrics, branding);
+        return sb.ToString();
+    }
+
+    private void BuildHtmlCore(StringBuilder sb, IReadOnlyList<StorageNode> nodes, IReadOnlyList<FileTypeMetric> fileTypeMetrics, ReportBranding? branding)
     {
         var T = TranslationSource.Instance;
         _togIdx = 0;
-        var sb = new StringBuilder();
+        _kindLabels = BuildKindLabelCache();
+        _kindLabelsHtml = BuildHtmlEncodedCache(_kindLabels);
 
         sb.AppendLine("<!DOCTYPE html>");
         sb.AppendLine("<html lang=\"en\">");
@@ -160,11 +186,17 @@ public class StorageHtmlExportService
         sb.Append(BrandingHtmlHelper.BuildBrandingHeader(branding));
         sb.AppendLine($"<h1>{T["report.title.storage"]}</h1>");
 
-        // ── Summary cards ──
-        var rootNodes = nodes.Where(n => n.IndentLevel == 0).ToList();
-        long siteTotal = rootNodes.Sum(n => n.TotalSizeBytes);
-        long versionTotal = rootNodes.Sum(n => n.VersionSizeBytes);
-        long fileTotal = rootNodes.Sum(n => n.TotalFileCount);
+        // ── Summary cards (single-pass aggregation) ──
+        var rootNodes = new List<StorageNode>(Math.Min(nodes.Count, 64));
+        long siteTotal = 0, versionTotal = 0, fileTotal = 0;
+        foreach (var n in nodes)
+        {
+            if (n.IndentLevel != 0) continue;
+            rootNodes.Add(n);
+            siteTotal    += n.TotalSizeBytes;
+            versionTotal += n.VersionSizeBytes;
+            fileTotal    += n.TotalFileCount;
+        }
 
         sb.AppendLine("<div class=\"stats\">");
         sb.AppendLine($"  <div class=\"stat-card\"><div class=\"value\">{FormatSize(siteTotal)}</div><div class=\"label\">{T["report.stat.total_size"]}</div></div>");
@@ -224,7 +256,10 @@ public class StorageHtmlExportService
               <tbody>
             """);
 
-        foreach (var node in nodes)
+        // Render only the pre-materialized root list — recursing into
+        // Children handles descendants. Iterating the flat list would render
+        // every descendant a second time as a top-level row.
+        foreach (var node in rootNodes)
         {
             RenderNode(sb, node);
         }
@@ -236,22 +271,24 @@ public class StorageHtmlExportService
 
         sb.AppendLine($"<p class=\"generated\">{T["report.text.generated_colon"]} {DateTime.Now:yyyy-MM-dd HH:mm}</p>");
         sb.AppendLine("</body></html>");
-
-        return sb.ToString();
     }
 
     /// <summary>Writes the library-only HTML report to <paramref name="filePath"/>.</summary>
     public async Task WriteAsync(IReadOnlyList<StorageNode> nodes, string filePath, CancellationToken ct, ReportBranding? branding = null)
     {
-        var html = BuildHtml(nodes, branding);
-        await File.WriteAllTextAsync(filePath, html, Encoding.UTF8, ct);
+        // Build into StringBuilder, stream chunks straight to disk —
+        // skips a full-document char-array copy from sb.ToString().
+        var sb = new StringBuilder(3072 + nodes.Count * 340);
+        BuildHtmlCore(sb, nodes, branding);
+        await ExportFileWriter.WriteHtmlChunksAsync(filePath, sb, ct);
     }
 
     /// <summary>Writes the HTML report including the file-type breakdown chart.</summary>
     public async Task WriteAsync(IReadOnlyList<StorageNode> nodes, IReadOnlyList<FileTypeMetric> fileTypeMetrics, string filePath, CancellationToken ct, ReportBranding? branding = null)
     {
-        var html = BuildHtml(nodes, fileTypeMetrics, branding);
-        await File.WriteAllTextAsync(filePath, html, Encoding.UTF8, ct);
+        var sb = new StringBuilder(4096 + nodes.Count * 340 + fileTypeMetrics.Count * 220);
+        BuildHtmlCore(sb, nodes, fileTypeMetrics, branding);
+        await ExportFileWriter.WriteHtmlChunksAsync(filePath, sb, ct);
     }
 
     /// <summary>
@@ -307,21 +344,7 @@ public class StorageHtmlExportService
             ? $"<button class=\"toggle-btn\" onclick=\"toggle({myIdx})\">&#9654;</button>{HtmlEncode(node.Name)}"
             : $"<span style=\"margin-left:{node.IndentLevel * 16}px\">{HtmlEncode(node.Name)}</span>";
 
-        string lastMod = node.LastModified.HasValue
-            ? node.LastModified.Value.ToString("yyyy-MM-dd")
-            : string.Empty;
-
-        sb.AppendLine($"""
-              <tr>
-                <td>{nameCell}</td>
-                <td>{HtmlEncode(KindLabel(node.Kind))}</td>
-                <td>{HtmlEncode(node.SiteTitle)}</td>
-                <td class="num">{node.TotalFileCount:N0}</td>
-                <td class="num">{FormatSize(node.TotalSizeBytes)}</td>
-                <td class="num">{FormatSize(node.VersionSizeBytes)}</td>
-                <td>{lastMod}</td>
-              </tr>
-            """);
+        AppendRow(sb, node, nameCell);
 
         if (hasChildren)
         {
@@ -346,21 +369,7 @@ public class StorageHtmlExportService
             ? $"<span style=\"{indent}\"><button class=\"toggle-btn\" onclick=\"toggle({myIdx})\">&#9654;</button>{HtmlEncode(node.Name)}</span>"
             : $"<span style=\"{indent}\">{HtmlEncode(node.Name)}</span>";
 
-        string lastMod = node.LastModified.HasValue
-            ? node.LastModified.Value.ToString("yyyy-MM-dd")
-            : string.Empty;
-
-        sb.AppendLine($"""
-              <tr>
-                <td>{nameCell}</td>
-                <td>{HtmlEncode(KindLabel(node.Kind))}</td>
-                <td>{HtmlEncode(node.SiteTitle)}</td>
-                <td class="num">{node.TotalFileCount:N0}</td>
-                <td class="num">{FormatSize(node.TotalSizeBytes)}</td>
-                <td class="num">{FormatSize(node.VersionSizeBytes)}</td>
-                <td>{lastMod}</td>
-              </tr>
-            """);
+        AppendRow(sb, node, nameCell);
 
         if (hasChildren)
         {
@@ -375,6 +384,35 @@ public class StorageHtmlExportService
         }
     }
 
+    /// <summary>
+    /// Appends one data row given the pre-rendered name cell. Hot path:
+    /// pulls localized kind labels from <see cref="_kindLabelsHtml"/> instead
+    /// of going through <c>ResourceManager.GetString</c> + <c>HtmlEncode</c>
+    /// per row.
+    /// </summary>
+    private void AppendRow(StringBuilder sb, StorageNode node, string nameCell)
+    {
+        int kindIdx = (int)node.Kind;
+        string kindLabel = (uint)kindIdx < (uint)_kindLabelsHtml.Length
+            ? _kindLabelsHtml[kindIdx]
+            : HtmlEncode(node.Kind.ToString());
+        string lastMod = node.LastModified.HasValue
+            ? node.LastModified.Value.ToString("yyyy-MM-dd")
+            : string.Empty;
+
+        sb.AppendLine($"""
+              <tr>
+                <td>{nameCell}</td>
+                <td>{kindLabel}</td>
+                <td>{HtmlEncode(node.SiteTitle)}</td>
+                <td class="num">{node.TotalFileCount:N0}</td>
+                <td class="num">{FormatSize(node.TotalSizeBytes)}</td>
+                <td class="num">{FormatSize(node.VersionSizeBytes)}</td>
+                <td>{lastMod}</td>
+              </tr>
+            """);
+    }
+
     private static string FormatSize(long bytes)
     {
         if (bytes >= 1_073_741_824L) return $"{bytes / 1_073_741_824.0:F2} GB";
@@ -400,4 +438,28 @@ public class StorageHtmlExportService
             _ => kind.ToString()
         };
     }
+
+    /// <summary>
+    /// Pre-resolves localized labels for every <see cref="StorageNodeKind"/>
+    /// once per export. Cached array index lookup avoids
+    /// <c>ResourceManager.GetString</c> per row in hot rendering loops.
+    /// </summary>
+    private static string[] BuildKindLabelCache()
+    {
+        var values = (StorageNodeKind[])Enum.GetValues(typeof(StorageNodeKind));
+        int max = 0;
+        foreach (var v in values) { int i = (int)v; if (i > max) max = i; }
+        var cache = new string[max + 1];
+        for (int i = 0; i < cache.Length; i++) cache[i] = ((StorageNodeKind)i).ToString();
+        foreach (var v in values) cache[(int)v] = KindLabel(v);
+        return cache;
+    }
+
+    /// <summary>HTML-encodes each entry of <paramref name="raw"/> once.</summary>
+    private static string[] BuildHtmlEncodedCache(string[] raw)
+    {
+        var encoded = new string[raw.Length];
+        for (int i = 0; i < raw.Length; i++) encoded[i] = HtmlEncode(raw[i]);
+        return encoded;
+    }
 }

SharepointToolbox/Services/Export/UserAccessCsvExportService.cs

@@ -15,7 +15,7 @@ public class UserAccessCsvExportService
     private static string BuildDataHeader()
     {
         var T = TranslationSource.Instance;
-        return $"\"{T["report.col.site"]}\",\"{T["report.col.object_type"]}\",\"{T["report.col.object"]}\",\"{T["report.col.url"]}\",\"{T["report.col.permission_level"]}\",\"{T["report.col.access_type"]}\",\"{T["report.col.granted_through"]}\"";
+        return $"\"{T["report.col.site"]}\",\"{T["report.col.object_type"]}\",\"{T["report.col.object"]}\",\"{T["report.col.url"]}\",\"{T["report.col.permission_level"]}\",\"{T["report.col.access_type"]}\",\"{T["report.col.granted_through"]}\",\"TargetLabel\",\"TargetUrl\",\"SharingLinkType\"";
     }
 
     /// <summary>
@@ -51,7 +51,10 @@ public class UserAccessCsvExportService
                 Csv(entry.ObjectUrl),
                 Csv(entry.PermissionLevel),
                 Csv(entry.AccessType.ToString()),
-                Csv(entry.GrantedThrough)
+                Csv(entry.GrantedThrough),
+                Csv(entry.TargetLabel ?? string.Empty),
+                Csv(entry.TargetUrl ?? string.Empty),
+                Csv(entry.SharingLinkType ?? string.Empty)
             }));
         }
 
@@ -179,7 +182,7 @@ public class UserAccessCsvExportService
             sb.AppendLine();
 
             // Header
-            sb.AppendLine($"\"{T["report.col.user"]}\",\"User Login\",\"{T["report.col.permission_level"]}\",\"{T["report.col.access_type"]}\",\"{T["report.col.granted_through"]}\",\"Locations\",\"Location Count\"");
+            sb.AppendLine($"\"{T["report.col.user"]}\",\"User Login\",\"{T["report.col.permission_level"]}\",\"{T["report.col.access_type"]}\",\"{T["report.col.granted_through"]}\",\"TargetLabel\",\"TargetUrl\",\"SharingLinkType\",\"Locations\",\"Location Count\"");
 
             // Data rows
             foreach (var entry in consolidated)
@@ -187,13 +190,16 @@ public class UserAccessCsvExportService
                 var locations = string.Join("; ", entry.Locations.Select(l => l.SiteTitle));
                 sb.AppendLine(string.Join(",", new[]
                 {
-                    $"\"{entry.UserDisplayName}\"",
-                    $"\"{entry.UserLogin}\"",
-                    $"\"{entry.PermissionLevel}\"",
-                    $"\"{entry.AccessType}\"",
-                    $"\"{entry.GrantedThrough}\"",
-                    $"\"{locations}\"",
-                    $"\"{entry.LocationCount}\""
+                    Csv(entry.UserDisplayName),
+                    Csv(entry.UserLogin),
+                    Csv(entry.PermissionLevel),
+                    Csv(entry.AccessType.ToString()),
+                    Csv(entry.GrantedThrough),
+                    Csv(entry.TargetLabel ?? string.Empty),
+                    Csv(entry.TargetUrl ?? string.Empty),
+                    Csv(entry.SharingLinkType ?? string.Empty),
+                    Csv(locations),
+                    Csv(entry.LocationCount.ToString())
                 }));
             }
 
@@ -226,7 +232,10 @@ public class UserAccessCsvExportService
                 Csv(entry.ObjectUrl),
                 Csv(entry.PermissionLevel),
                 Csv(entry.AccessType.ToString()),
-                Csv(entry.GrantedThrough)
+                Csv(entry.GrantedThrough),
+                Csv(entry.TargetLabel ?? string.Empty),
+                Csv(entry.TargetUrl ?? string.Empty),
+                Csv(entry.SharingLinkType ?? string.Empty)
             }));
         }
 

SharepointToolbox/Services/Export/UserAccessHtmlExportService.cs

@@ -250,7 +250,7 @@ a:hover { text-decoration: underline; }
                 sb.AppendLine($"  <td>{objectCell}</td>");
                 sb.AppendLine($"  <td{rowClass}>{HtmlEncode(entry.PermissionLevel)}{highIcon}</td>");
                 sb.AppendLine($"  <td>{accessBadge}</td>");
-                sb.AppendLine($"  <td>{HtmlEncode(entry.GrantedThrough)}</td>");
+                sb.AppendLine($"  <td>{PermissionHtmlFragments.BuildGrantedThroughCell(entry.GrantedThrough, entry.TargetUrl, entry.TargetLabel, entry.SharingLinkType)}</td>");
                 sb.AppendLine("</tr>");
             }
         }
@@ -301,7 +301,7 @@ a:hover { text-decoration: underline; }
                 sb.AppendLine($"  <td>{objectCell}</td>");
                 sb.AppendLine($"  <td{rowClass}>{HtmlEncode(entry.PermissionLevel)}{highIcon}</td>");
                 sb.AppendLine($"  <td>{accessBadge}</td>");
-                sb.AppendLine($"  <td>{HtmlEncode(entry.GrantedThrough)}</td>");
+                sb.AppendLine($"  <td>{PermissionHtmlFragments.BuildGrantedThroughCell(entry.GrantedThrough, entry.TargetUrl, entry.TargetLabel, entry.SharingLinkType)}</td>");
                 sb.AppendLine("</tr>");
             }
         }
@@ -579,7 +579,7 @@ a:hover { text-decoration: underline; }
                 sb.AppendLine($"  <td{rowClass}>{HtmlEncode(entry.UserDisplayName)}{guestBadge}</td>");
                 sb.AppendLine($"  <td{rowClass}>{HtmlEncode(entry.PermissionLevel)}{highIcon}</td>");
                 sb.AppendLine($"  <td>{accessBadge}</td>");
-                sb.AppendLine($"  <td>{HtmlEncode(entry.GrantedThrough)}</td>");
+                sb.AppendLine($"  <td>{PermissionHtmlFragments.BuildGrantedThroughCell(entry.GrantedThrough, entry.TargetUrl, entry.TargetLabel, entry.SharingLinkType)}</td>");
 
                 if (entry.LocationCount == 1)
                 {

SharepointToolbox/Services/ISystemGroupTargetResolver.cs

@@ -0,0 +1,23 @@
+using Microsoft.SharePoint.Client;
+using SharepointToolbox.Core.Helpers;
+using SharepointToolbox.Core.Models;
+
+namespace SharepointToolbox.Services;
+
+/// <summary>
+/// Resolves the targeted resource (List, Web, File, Folder) for a SharePoint system
+/// group whose name encodes a GUID — Limited Access System Group For Web/List and
+/// SharingLinks.{itemId}.{type}.{shareId}. Returns null when the target is missing
+/// or unreachable (deleted item, access denied, etc.) — callers fall back to the
+/// raw group name.
+/// </summary>
+public interface ISystemGroupTargetResolver
+{
+    /// <summary>
+    /// Resolves the target for a classified system group. Cached per (ctx site, guid).
+    /// </summary>
+    Task<SystemGroupTarget?> ResolveAsync(
+        ClientContext ctx,
+        SystemGroupClassification classification,
+        CancellationToken ct);
+}

SharepointToolbox/Services/PermissionsService.cs

@@ -11,6 +11,16 @@ namespace SharepointToolbox.Services;
 /// </summary>
 public class PermissionsService : IPermissionsService
 {
+    private readonly ISystemGroupTargetResolver? _systemGroupResolver;
+
+    public PermissionsService() : this(null) { }
+
+    public PermissionsService(ISystemGroupTargetResolver? systemGroupResolver)
+    {
+        _systemGroupResolver = systemGroupResolver;
+    }
+
+
     /// <summary>
     /// Detects the SharePoint server error raised when a RoleAssignment member
     /// refers to a user that no longer resolves (orphaned Azure AD account).
@@ -336,9 +346,18 @@ public class PermissionsService : IPermissionsService
 
             var member = ra.Member;
             var loginName = member.LoginName ?? string.Empty;
+            var memberTitle = member.Title ?? string.Empty;
 
-            // Skip sharing links groups and limited access system groups
-            if (PermissionEntryHelper.IsSharingLinksGroup(loginName))
+            // Classify the member name. The bare "Limited Access System Group" is
+            // pure noise; drop it. The For-Web/For-List and SharingLinks variants
+            // are kept and enriched below with a resolved target URL.
+            var classification = PermissionEntryHelper.Classify(memberTitle);
+            if (classification.Kind == SystemGroupKind.None
+                && PermissionEntryHelper.IsBareLimitedAccessSystemGroup(loginName))
+            {
+                continue;
+            }
+            if (classification.Kind == SystemGroupKind.LimitedAccessBare)
                 continue;
 
             // Collect and filter permission levels
@@ -362,19 +381,42 @@ public class PermissionsService : IPermissionsService
 
             // Determine how the permission was granted
             string grantedThrough = principalType == "SharePointGroup"
-                ? $"SharePoint Group: {member.Title}"
+                ? $"SharePoint Group: {memberTitle}"
                 : "Direct Permissions";
 
+            // Resolve system-group target (Limited Access For Web/List, SharingLinks)
+            string? targetUrl = null;
+            string? targetLabel = null;
+            string? sharingLinkType = null;
+            if (_systemGroupResolver is not null && classification.Kind != SystemGroupKind.None)
+            {
+                var target = await _systemGroupResolver.ResolveAsync(ctx, classification, ct);
+                if (target is not null)
+                {
+                    targetUrl = target.Url;
+                    targetLabel = target.Label;
+                    sharingLinkType = target.LinkType;
+                }
+                else if (classification.Kind == SystemGroupKind.SharingLink)
+                {
+                    // Target lookup failed (deleted item / no access) — still surface link type.
+                    sharingLinkType = classification.LinkType;
+                }
+            }
+
             entries.Add(new PermissionEntry(
                 ObjectType: objectType,
                 Title: title,
                 Url: url,
                 HasUniquePermissions: obj.HasUniqueRoleAssignments,
-                Users: member.Title ?? string.Empty,
+                Users: memberTitle,
                 UserLogins: loginName,
                 PermissionLevels: permLevels,
                 GrantedThrough: grantedThrough,
-                PrincipalType: principalType));
+                PrincipalType: principalType,
+                TargetUrl: targetUrl,
+                TargetLabel: targetLabel,
+                SharingLinkType: sharingLinkType));
         }
 
         return entries;

SharepointToolbox/Services/StorageService.cs

@@ -58,7 +58,11 @@ public class StorageService : IStorageService
         var lists = web.Lists.ToList();
 
         // ── Document libraries (incl. hidden + Preservation Hold) ───────────
+        // Track each library's RootFolder server-relative URL so bin items can
+        // be attributed back to their source library (matches storman.aspx,
+        // which folds bin contents into the owning library's Total Size).
         var docLibs = lists.Where(l => l.BaseType == BaseType.DocumentLibrary).ToList();
+        var libsByRoot = new Dictionary<string, StorageNode>(StringComparer.OrdinalIgnoreCase);
         int idx = 0;
         foreach (var lib in docLibs)
         {
@@ -84,7 +88,17 @@ public class StorageService : IStorageService
                     siteTitle, lib.Title, kind, progress, ct);
             }
 
+            // CSOM Folder.StorageMetrics is unreliable across the board for
+            // larger libraries — sometimes returns the storman value, sometimes
+            // returns a fraction of it, sometimes zero. Subfolder StorageMetrics
+            // are equally inconsistent. The only CSOM path that matches storman
+            // is per-file File.Length + File.Versions[*].Size enumeration, so
+            // run it unconditionally, replacing the CSOM totals.
+            ResetNodeCounts(libNode);
+            await BackfillLibFromFilesAsync(ctx, lib, libNode, progress, ct);
+
             result.Add(libNode);
+            libsByRoot[NormalizeServerRelative(lib.RootFolder.ServerRelativeUrl)] = libNode;
         }
 
         // ── List attachments (non-document-library lists) ───────────────────
@@ -114,7 +128,33 @@ public class StorageService : IStorageService
             progress.Report(OperationProgress.Indeterminate(
                 $"Scanning recycle bin: {siteTitle}..."));
 
-            var rbNodes = await LoadRecycleBinNodesAsync(ctx, siteTitle, progress, ct);
+            var (rbNodes, perDir) = await LoadRecycleBinNodesAsync(ctx, web, siteTitle, progress, ct);
+
+            // Attribute bin items to owning library (longest-prefix match on DirName)
+            // so library Total Size matches storman.aspx, which counts an item's
+            // bytes against its source library even after deletion.
+            if (perDir.Count > 0 && libsByRoot.Count > 0)
+            {
+                var libRootsByLength = libsByRoot
+                    .OrderByDescending(kv => kv.Key.Length)
+                    .ToList();
+
+                foreach (var kv in perDir)
+                {
+                    string dirNorm = NormalizeServerRelative(kv.Key);
+                    foreach (var lib in libRootsByLength)
+                    {
+                        if (dirNorm.Equals(lib.Key, StringComparison.OrdinalIgnoreCase) ||
+                            dirNorm.StartsWith(lib.Key + "/", StringComparison.OrdinalIgnoreCase))
+                        {
+                            lib.Value.TotalSizeBytes += kv.Value.Size;
+                            lib.Value.TotalFileCount += kv.Value.Count;
+                            break;
+                        }
+                    }
+                }
+            }
+
             result.AddRange(rbNodes);
         }
 
@@ -131,6 +171,9 @@ public class StorageService : IStorageService
                 await CollectForWebAsync(ctx, sub, options, subResult, progress, ct);
                 if (subResult.Count == 0) continue;
 
+                // Bin contents already rolled up into each library's TotalSizeBytes
+                // (storman behavior); summing root RecycleBin children too would
+                // double-count. Filter them out here.
                 var subRoot = new StorageNode
                 {
                     Name           = sub.Title,
@@ -140,9 +183,9 @@ public class StorageService : IStorageService
                     Kind           = StorageNodeKind.Subsite,
                     IndentLevel    = 0,
                     Children       = subResult,
-                    TotalSizeBytes      = subResult.Sum(n => n.TotalSizeBytes),
-                    FileStreamSizeBytes = subResult.Sum(n => n.FileStreamSizeBytes),
-                    TotalFileCount      = subResult.Sum(n => n.TotalFileCount)
+                    TotalSizeBytes      = subResult.Where(n => n.Kind != StorageNodeKind.RecycleBin).Sum(n => n.TotalSizeBytes),
+                    FileStreamSizeBytes = subResult.Where(n => n.Kind != StorageNodeKind.RecycleBin).Sum(n => n.FileStreamSizeBytes),
+                    TotalFileCount      = subResult.Where(n => n.Kind != StorageNodeKind.RecycleBin).Sum(n => n.TotalFileCount)
                 };
                 result.Add(subRoot);
             }
@@ -210,23 +253,34 @@ public class StorageService : IStorageService
         }
     }
 
-    private static async Task<List<StorageNode>> LoadRecycleBinNodesAsync(
+    private static async Task<(List<StorageNode> Nodes, Dictionary<string, (long Size, int Count)> PerDir)> LoadRecycleBinNodesAsync(
         ClientContext ctx,
+        Web web,
         string siteTitle,
         IProgress<OperationProgress> progress,
         CancellationToken ct)
     {
         var nodes = new List<StorageNode>();
+        var perDir = new Dictionary<string, (long Size, int Count)>(StringComparer.OrdinalIgnoreCase);
 
         try
         {
-            var bin = ctx.Site.RecycleBin;
+            // Web-scoped: ctx.Site.RecycleBin would return the entire site-collection
+            // bin and inflate totals by (1 + N_subsites) when IncludeSubsites is on.
+            var bin = web.RecycleBin;
             ctx.Load(bin, b => b.Include(
                 i => i.Size,
                 i => i.ItemState,
-                i => i.DeletedDate));
+                i => i.DeletedDate,
+                i => i.DirName));
             await ExecuteQueryRetryHelper.ExecuteQueryRetryAsync(ctx, progress, ct);
 
+            // RecycleBinItem.DirName is web-relative on SharePoint Online
+            // (e.g. "Documents/SubFolder" without leading slash or web URL).
+            // Prepend the web's ServerRelativeUrl so the result matches
+            // List.RootFolder.ServerRelativeUrl form used by libsByRoot.
+            string webSrl = NormalizeServerRelative(web.ServerRelativeUrl);
+
             long stage1Size = 0, stage2Size = 0;
             int stage1Count = 0, stage2Count = 0;
             DateTime? stage1Last = null, stage2Last = null;
@@ -245,6 +299,20 @@ public class StorageService : IStorageService
                     stage1Count++;
                     if (stage1Last is null || item.DeletedDate > stage1Last) stage1Last = item.DeletedDate;
                 }
+
+                string raw = item.DirName ?? string.Empty;
+                string dirSrl;
+                if (raw.StartsWith('/'))
+                    dirSrl = NormalizeServerRelative(raw);
+                else if (string.IsNullOrEmpty(raw))
+                    dirSrl = webSrl;
+                else
+                    dirSrl = NormalizeServerRelative(webSrl + "/" + raw);
+
+                if (perDir.TryGetValue(dirSrl, out var tally))
+                    perDir[dirSrl] = (tally.Size + item.Size, tally.Count + 1);
+                else
+                    perDir[dirSrl] = (item.Size, 1);
             }
 
             if (stage1Count > 0)
@@ -282,7 +350,21 @@ public class StorageService : IStorageService
             // Insufficient permission to read recycle bin or feature unavailable.
         }
 
-        return nodes;
+        return (nodes, perDir);
+    }
+
+    /// <summary>
+    /// Normalizes a server-relative path for consistent prefix matching:
+    /// trims trailing slash, ensures single leading slash. SharePoint
+    /// inconsistently returns DirName with or without leading slash across
+    /// API surfaces, so the caller cannot rely on a canonical form.
+    /// </summary>
+    private static string NormalizeServerRelative(string? path)
+    {
+        if (string.IsNullOrEmpty(path)) return string.Empty;
+        string trimmed = path.Trim().TrimEnd('/');
+        if (trimmed.Length == 0) return string.Empty;
+        return trimmed.StartsWith('/') ? trimmed : "/" + trimmed;
     }
 
     public async Task<IReadOnlyList<FileTypeMetric>> CollectFileTypeMetricsAsync(
@@ -314,6 +396,10 @@ public class StorageService : IStorageService
             progress.Report(new OperationProgress(libIdx, libs.Count,
                 $"Scanning files by type: {lib.Title} ({libIdx}/{libs.Count})"));
 
+            // No <Where> clause: filtering on FSObjType (non-indexed) on a list
+            // beyond 5000 items breaches the list view threshold. Page lightly,
+            // then second-pass load File.Length + Versions[*].Size so per-type
+            // totals include version bytes (matches per-library totals).
             var query = new CamlQuery
             {
                 ViewXml = @"<View Scope='RecursiveAll'>
@@ -321,9 +407,8 @@ public class StorageService : IStorageService
                     <ViewFields>
                         <FieldRef Name='FSObjType' />
                         <FieldRef Name='FileLeafRef' />
-                        <FieldRef Name='File_x0020_Size' />
                     </ViewFields>
-                    <RowLimit Paged='TRUE'>5000</RowLimit>
+                    <RowLimit Paged='TRUE'>500</RowLimit>
                 </View>"
             };
 
@@ -335,21 +420,40 @@ public class StorageService : IStorageService
                 ctx.Load(items, ic => ic.ListItemCollectionPosition,
                     ic => ic.Include(
                         i => i["FSObjType"],
-                        i => i["FileLeafRef"],
-                        i => i["File_x0020_Size"]));
+                        i => i["FileLeafRef"]));
                 await ExecuteQueryRetryHelper.ExecuteQueryRetryAsync(ctx, progress, ct);
 
+                var fileRows = new List<(ListItem Item, string Name)>();
                 foreach (var item in items)
                 {
                     if (item["FSObjType"]?.ToString() != "0") continue;
-
                     string fileName = item["FileLeafRef"]?.ToString() ?? string.Empty;
-                    string sizeStr = item["File_x0020_Size"]?.ToString() ?? "0";
+                    fileRows.Add((item, fileName));
+                    ctx.Load(item.File, f => f.Length);
+                    ctx.Load(item.File.Versions, vc => vc.Include(v => v.Size));
+                }
 
-                    if (!long.TryParse(sizeStr, out long fileSize))
-                        fileSize = 0;
+                if (fileRows.Count > 0)
+                {
+                    await ExecuteQueryRetryHelper.ExecuteQueryRetryAsync(ctx, progress, ct);
+                }
 
-                    string ext = Path.GetExtension(fileName).ToLowerInvariant();
+                foreach (var row in fileRows)
+                {
+                    long current;
+                    try { current = row.Item.File.Length; }
+                    catch { continue; }
+
+                    long versions = 0;
+                    try
+                    {
+                        foreach (var v in row.Item.File.Versions)
+                            versions += v.Size;
+                    }
+                    catch { /* no version history */ }
+
+                    long fileSize = current + versions;
+                    string ext = Path.GetExtension(row.Name).ToLowerInvariant();
 
                     if (extensionMap.TryGetValue(ext, out var existing))
                         extensionMap[ext] = (existing.totalSize + fileSize, existing.count + 1);
@@ -368,54 +472,33 @@ public class StorageService : IStorageService
             .ToList();
     }
 
-    public async Task BackfillZeroNodesAsync(
+    /// <summary>
+    /// Per-library backfill executed inline by CollectForWebAsync when CSOM's
+    /// Folder.StorageMetrics returns zero counts. Enumerates every file via
+    /// CamlQuery and explicitly loads File.Length + File.Versions.Size so
+    /// version bytes are summed accurately — matches what storman.aspx reports.
+    /// </summary>
+    private static async Task BackfillLibFromFilesAsync(
         ClientContext ctx,
-        IReadOnlyList<StorageNode> nodes,
+        List lib,
+        StorageNode libNode,
         IProgress<OperationProgress> progress,
         CancellationToken ct)
     {
-        // Only backfill nodes scanned through CSOM document-library StorageMetrics —
-        // synthetic categories (recycle bin, list attachments, subsite headers)
-        // cannot be re-derived from File_x0020_Size.
-        var libNodes = nodes.Where(n => n.IndentLevel == 0 &&
-            (n.Kind == StorageNodeKind.Library ||
-             n.Kind == StorageNodeKind.HiddenLibrary ||
-             n.Kind == StorageNodeKind.PreservationHold)).ToList();
-        var needsBackfill = libNodes.Where(lib =>
-            lib.TotalFileCount == 0 || HasZeroChild(lib)).ToList();
-        if (needsBackfill.Count == 0) return;
+        progress.Report(OperationProgress.Indeterminate(
+            $"Counting files: {libNode.Name}..."));
 
-        ctx.Load(ctx.Web, w => w.ServerRelativeUrl,
-            w => w.Lists.Include(
-                l => l.Title, l => l.Hidden, l => l.BaseType,
-                l => l.RootFolder.ServerRelativeUrl));
-        await ExecuteQueryRetryHelper.ExecuteQueryRetryAsync(ctx, progress, ct);
-
-        var libs = ctx.Web.Lists
-            .Where(l => l.BaseType == BaseType.DocumentLibrary)
-            .ToDictionary(l => l.Title, StringComparer.OrdinalIgnoreCase);
-
-        int idx = 0;
-        foreach (var libNode in needsBackfill)
-        {
-            ct.ThrowIfCancellationRequested();
-            idx++;
-
-            if (!libs.TryGetValue(libNode.Library, out var lib)) continue;
-
-            progress.Report(new OperationProgress(idx, needsBackfill.Count,
-                $"Counting files: {libNode.Name} ({idx}/{needsBackfill.Count})"));
-
-            string libRootSrl = lib.RootFolder.ServerRelativeUrl.TrimEnd('/');
+        string libRootSrl = NormalizeServerRelative(lib.RootFolder.ServerRelativeUrl);
 
         var folderLookup = new Dictionary<string, StorageNode>(StringComparer.OrdinalIgnoreCase);
         BuildFolderLookup(libNode, libRootSrl, folderLookup);
 
-            var originalTotals = new Dictionary<StorageNode, long>();
-            CaptureTotals(libNode, originalTotals);
-
-            ResetNodeCounts(libNode);
-
+        // No <Where> clause: filtering on FSObjType (non-indexed) on a list
+        // beyond the 5000-item view threshold throws "The attempted operation
+        // is prohibited because it exceeds the list view threshold". Paged
+        // retrieval without Where is unaffected by the threshold; we filter
+        // out folders client-side and skip File.Length access for them.
+        // Smaller page size because each row carries the full Versions collection.
         var query = new CamlQuery
         {
             ViewXml = @"<View Scope='RecursiveAll'>
@@ -423,11 +506,8 @@ public class StorageService : IStorageService
                 <ViewFields>
                     <FieldRef Name='FSObjType' />
                     <FieldRef Name='FileDirRef' />
-                        <FieldRef Name='File_x0020_Size' />
-                        <FieldRef Name='SMTotalSize' />
-                        <FieldRef Name='SMTotalFileStreamSize' />
                 </ViewFields>
-                    <RowLimit Paged='TRUE'>5000</RowLimit>
+                <RowLimit Paged='TRUE'>500</RowLimit>
             </View>"
         };
 
@@ -439,50 +519,98 @@ public class StorageService : IStorageService
             ctx.Load(items, ic => ic.ListItemCollectionPosition,
                 ic => ic.Include(
                     i => i["FSObjType"],
-                        i => i["FileDirRef"],
-                        i => i["File_x0020_Size"],
-                        i => i["SMTotalSize"],
-                        i => i["SMTotalFileStreamSize"]));
+                    i => i["FileDirRef"]));
             await ExecuteQueryRetryHelper.ExecuteQueryRetryAsync(ctx, progress, ct);
 
+            // Second pass: queue File.Length + File.Versions[*].Size only for
+            // file rows. Including these in the page 1 query throws a
+            // ServerObjectNullReferenceException on folder rows (item.File is
+            // null for folders). Filtering FSObjType client-side here keeps
+            // per-page round-trips at two regardless of file count.
+            var fileRows = new List<(ListItem Item, string DirRef)>();
             foreach (var item in items)
             {
                 if (item["FSObjType"]?.ToString() != "0") continue;
-
-                    long streamSize = ParseLong(item["File_x0020_Size"]);
-                    long smStream   = ParseLong(SafeGet(item, "SMTotalFileStreamSize"));
-                    long smTotal    = ParseLong(SafeGet(item, "SMTotalSize"));
-
-                    if (smStream > 0) streamSize = smStream;
-                    long totalSize = smTotal > 0 ? smTotal : streamSize;
-
-                    string fileDirRef = item["FileDirRef"]?.ToString() ?? "";
-
-                    libNode.TotalSizeBytes += totalSize;
-                    libNode.FileStreamSizeBytes += streamSize;
-                    libNode.TotalFileCount++;
-
-                    var matchedFolder = FindDeepestFolder(fileDirRef, folderLookup);
-                    if (matchedFolder != null && matchedFolder != libNode)
-                    {
-                        matchedFolder.TotalSizeBytes += totalSize;
-                        matchedFolder.FileStreamSizeBytes += streamSize;
-                        matchedFolder.TotalFileCount++;
+                var dirRef = item["FileDirRef"]?.ToString() ?? string.Empty;
+                fileRows.Add((item, dirRef));
+                ctx.Load(item.File, f => f.Length);
+                ctx.Load(item.File.Versions, vc => vc.Include(v => v.Size));
             }
+
+            if (fileRows.Count > 0)
+            {
+                await ExecuteQueryRetryHelper.ExecuteQueryRetryAsync(ctx, progress, ct);
+            }
+
+            foreach (var row in fileRows)
+            {
+                long current;
+                try { current = row.Item.File.Length; }
+                catch { continue; }
+
+                long versions = 0;
+                try
+                {
+                    foreach (var v in row.Item.File.Versions)
+                        versions += v.Size;
+                }
+                catch
+                {
+                    // Versioning disabled / no version history — leave at 0.
+                }
+
+                long totalSize = current + versions;
+
+                // Attribute each file to its deepest matching folder only.
+                // Parent rollup happens once after all pages are processed,
+                // adding direct + descendants — matches storman's per-folder
+                // total. Fall back to libNode for files at lib root or in
+                // folders excluded from the tree (Forms, _-prefixed system
+                // folders, depth-limited subfolders).
+                var target = FindDeepestFolder(row.DirRef, folderLookup) ?? libNode;
+                target.TotalSizeBytes      += totalSize;
+                target.FileStreamSizeBytes += current;
+                target.TotalFileCount++;
             }
 
             query.ListItemCollectionPosition = items.ListItemCollectionPosition;
         }
         while (items.ListItemCollectionPosition != null);
 
-            foreach (var kv in originalTotals)
+        // Post-pass rollup: each folder's totals become own-direct + sum of
+        // descendants. libNode ends up as total of every file in the tree.
+        RollupFolderTotals(libNode);
+    }
+
+    /// <summary>
+    /// Recursively rolls up direct-file totals into ancestor folders so each
+    /// node's reported size includes everything beneath it. Pre-condition: each
+    /// node holds only its directly-attributed files (no descendant amounts).
+    /// </summary>
+    private static void RollupFolderTotals(StorageNode node)
     {
-                if (kv.Value > kv.Key.TotalSizeBytes)
-                    kv.Key.TotalSizeBytes = kv.Value;
-            }
+        foreach (var child in node.Children)
+        {
+            RollupFolderTotals(child);
+            node.TotalSizeBytes      += child.TotalSizeBytes;
+            node.FileStreamSizeBytes += child.FileStreamSizeBytes;
+            node.TotalFileCount      += child.TotalFileCount;
         }
     }
 
+    /// <summary>
+    /// No-op retained for interface compatibility. Backfill now runs inline
+    /// inside <see cref="CollectStorageAsync"/> via BackfillLibFromFilesAsync,
+    /// which has access to the CSOM library reference and runs before bin
+    /// distribution so the count==0 trigger is not polluted by bin items.
+    /// </summary>
+    public Task BackfillZeroNodesAsync(
+        ClientContext ctx,
+        IReadOnlyList<StorageNode> nodes,
+        IProgress<OperationProgress> progress,
+        CancellationToken ct)
+        => Task.CompletedTask;
+
     public async Task<long> GetSiteUsageStorageBytesAsync(
         ClientContext ctx,
         IProgress<OperationProgress> progress,
@@ -500,35 +628,6 @@ public class StorageService : IStorageService
         }
     }
 
-    private static long ParseLong(object? value)
-    {
-        if (value == null) return 0;
-        return long.TryParse(value.ToString(), out long n) ? n : 0;
-    }
-
-    private static object? SafeGet(ListItem item, string fieldName)
-    {
-        try { return item[fieldName]; }
-        catch { return null; }
-    }
-
-    private static void CaptureTotals(StorageNode node, Dictionary<StorageNode, long> map)
-    {
-        map[node] = node.TotalSizeBytes;
-        foreach (var child in node.Children)
-            CaptureTotals(child, map);
-    }
-
-    private static bool HasZeroChild(StorageNode node)
-    {
-        foreach (var child in node.Children)
-        {
-            if (child.TotalFileCount == 0) return true;
-            if (HasZeroChild(child)) return true;
-        }
-        return false;
-    }
-
     private static void ResetNodeCounts(StorageNode node)
     {
         node.TotalSizeBytes      = 0;

SharepointToolbox/Services/SystemGroupTargetResolver.cs

@@ -0,0 +1,205 @@
+using Microsoft.SharePoint.Client;
+using Microsoft.SharePoint.Client.Search.Query;
+using Serilog;
+using SharepointToolbox.Core.Helpers;
+using SharepointToolbox.Core.Models;
+
+namespace SharepointToolbox.Services;
+
+/// <summary>
+/// CSOM-backed resolver that converts the GUID/identifier embedded in a SharePoint
+/// system group name into a clickable target. Results are cached per
+/// (site URL, guid) to avoid repeated round-trips when the same Limited Access
+/// system group recurs on many objects.
+///
+/// Never throws — on any failure (not found, access denied, claims error), returns
+/// <c>null</c> and the caller renders the raw group name.
+/// </summary>
+public class SystemGroupTargetResolver : ISystemGroupTargetResolver
+{
+    private readonly Dictionary<string, SystemGroupTarget?> _cache =
+        new(StringComparer.OrdinalIgnoreCase);
+
+    public async Task<SystemGroupTarget?> ResolveAsync(
+        ClientContext ctx,
+        SystemGroupClassification classification,
+        CancellationToken ct)
+    {
+        ct.ThrowIfCancellationRequested();
+
+        var key = BuildCacheKey(ctx.Url, classification);
+        if (key is not null && _cache.TryGetValue(key, out var cached))
+            return cached;
+
+        SystemGroupTarget? result = null;
+        try
+        {
+            result = classification.Kind switch
+            {
+                SystemGroupKind.LimitedAccessWeb  => await ResolveWebAsync(ctx, classification.WebId!.Value, ct),
+                SystemGroupKind.LimitedAccessList => await ResolveListAsync(ctx, classification.ListId!.Value, ct),
+                SystemGroupKind.SharingLink       => await ResolveItemAsync(ctx, classification.ItemUniqueId!.Value, classification.LinkType, ct),
+                _ => null
+            };
+        }
+        catch (Exception ex)
+        {
+            Log.Debug("System group target resolution failed for {Kind} on {Site}: {Error}",
+                classification.Kind, ctx.Url, ex.Message);
+        }
+
+        if (key is not null)
+            _cache[key] = result;
+        return result;
+    }
+
+    private static string? BuildCacheKey(string siteUrl, SystemGroupClassification c) => c.Kind switch
+    {
+        SystemGroupKind.LimitedAccessWeb  => $"{siteUrl}|web|{c.WebId}",
+        SystemGroupKind.LimitedAccessList => $"{siteUrl}|list|{c.ListId}",
+        SystemGroupKind.SharingLink       => $"{siteUrl}|item|{c.ItemUniqueId}",
+        _ => null
+    };
+
+    private static async Task<SystemGroupTarget?> ResolveWebAsync(
+        ClientContext ctx, Guid webId, CancellationToken ct)
+    {
+        var web = ctx.Site.OpenWebById(webId);
+        ctx.Load(web, w => w.Title, w => w.Url);
+        await ExecuteQueryRetryHelper.ExecuteQueryRetryAsync(ctx, null, ct);
+        return new SystemGroupTarget(SystemGroupKind.LimitedAccessWeb, web.Title, web.Url);
+    }
+
+    private static async Task<SystemGroupTarget?> ResolveListAsync(
+        ClientContext ctx, Guid listId, CancellationToken ct)
+    {
+        var list = ctx.Web.Lists.GetById(listId);
+        ctx.Load(list, l => l.Title, l => l.DefaultViewUrl);
+        await ExecuteQueryRetryHelper.ExecuteQueryRetryAsync(ctx, null, ct);
+
+        var url = BuildAbsoluteUrl(ctx.Url, list.DefaultViewUrl);
+        return new SystemGroupTarget(SystemGroupKind.LimitedAccessList, list.Title, url);
+    }
+
+    private static async Task<SystemGroupTarget?> ResolveItemAsync(
+        ClientContext ctx, Guid itemUniqueId, string? linkType, CancellationToken ct)
+    {
+        // 1. Try as file on current web (most sharing links target files).
+        try
+        {
+            var file = ctx.Web.GetFileById(itemUniqueId);
+            ctx.Load(file, f => f.Name, f => f.ServerRelativeUrl, f => f.Exists);
+            await ExecuteQueryRetryHelper.ExecuteQueryRetryAsync(ctx, null, ct);
+
+            if (file.Exists)
+            {
+                var url = BuildAbsoluteUrl(ctx.Url, file.ServerRelativeUrl);
+                return new SystemGroupTarget(SystemGroupKind.SharingLink, file.Name, url, linkType);
+            }
+        }
+        catch (ServerException) { /* fall through */ }
+
+        // 2. Try as folder on current web.
+        try
+        {
+            var folder = ctx.Web.GetFolderById(itemUniqueId);
+            ctx.Load(folder, f => f.Name, f => f.ServerRelativeUrl);
+            await ExecuteQueryRetryHelper.ExecuteQueryRetryAsync(ctx, null, ct);
+
+            var url = BuildAbsoluteUrl(ctx.Url, folder.ServerRelativeUrl);
+            return new SystemGroupTarget(SystemGroupKind.SharingLink, folder.Name, url, linkType);
+        }
+        catch (ServerException) { /* fall through */ }
+
+        // 3. Search-index fallback — covers items moved to a different subsite or
+        //    deleted recently (the index may lag the deletion by minutes/hours).
+        //    Search is permission-trimmed, so this only returns hits the caller
+        //    can still see; results carry a "(via index)" hint in the label.
+        return await TryResolveViaSearchAsync(ctx, itemUniqueId, linkType, ct);
+    }
+
+    /// <summary>
+    /// Queries the SharePoint search index for an item by its UniqueId. Returns
+    /// a target with the last-indexed path and a label prefix flagging that the
+    /// hit came from the index (so admins know the live lookup failed).
+    /// </summary>
+    private static async Task<SystemGroupTarget?> TryResolveViaSearchAsync(
+        ClientContext ctx, Guid itemUniqueId, string? linkType, CancellationToken ct)
+    {
+        ct.ThrowIfCancellationRequested();
+        try
+        {
+            // KQL: UniqueId managed property. Braces around the GUID are how the
+            // SP search engine matches the canonical form for content unique ids.
+            var kq = new KeywordQuery(ctx)
+            {
+                QueryText      = $"UniqueId:{{{itemUniqueId}}}",
+                RowLimit       = 1,
+                TrimDuplicates = false
+            };
+            kq.SelectProperties.Add("Path");
+            kq.SelectProperties.Add("Title");
+            kq.SelectProperties.Add("FileExtension");
+
+            var executor = new SearchExecutor(ctx);
+            var result = executor.ExecuteQuery(kq);
+            await ExecuteQueryRetryHelper.ExecuteQueryRetryAsync(ctx, null, ct);
+
+            var table = result.Value
+                .FirstOrDefault(t => t.TableType == KnownTableTypes.RelevantResults);
+            if (table is null || table.RowCount == 0)
+                return null;
+
+            var row = ToDict(table.ResultRows.First());
+            var path  = row.TryGetValue("Path",  out var p) ? p?.ToString() : null;
+            var title = row.TryGetValue("Title", out var t) ? t?.ToString() : null;
+
+            if (string.IsNullOrEmpty(path))
+                return null;
+
+            // Derive a leaf name if Title is empty (folders often have no Title).
+            var leaf = !string.IsNullOrWhiteSpace(title)
+                ? title!
+                : Uri.UnescapeDataString(path.TrimEnd('/').Split('/').Last());
+
+            return new SystemGroupTarget(
+                SystemGroupKind.SharingLink,
+                $"{leaf} (via index)",
+                path,
+                linkType);
+        }
+        catch (Exception ex)
+        {
+            Log.Debug("UniqueId search fallback failed for {Item} on {Site}: {Error}",
+                itemUniqueId, ctx.Url, ex.Message);
+            return null;
+        }
+    }
+
+    /// <summary>
+    /// CSOM SearchExecutor returns ResultRows as either generic Dictionary or legacy
+    /// IDictionary depending on CSOM version — normalise to a single shape.
+    /// </summary>
+    private static IDictionary<string, object> ToDict(object rawRow)
+    {
+        if (rawRow is IDictionary<string, object> generic)
+            return generic;
+        var dict = new Dictionary<string, object>();
+        if (rawRow is System.Collections.IDictionary legacy)
+        {
+            foreach (System.Collections.DictionaryEntry e in legacy)
+                dict[e.Key.ToString()!] = e.Value ?? string.Empty;
+        }
+        return dict;
+    }
+
+    private static string BuildAbsoluteUrl(string contextUrl, string? serverRelative)
+    {
+        if (string.IsNullOrEmpty(serverRelative))
+            return contextUrl;
+        if (Uri.TryCreate(serverRelative, UriKind.Absolute, out _))
+            return serverRelative;
+        var uri = new Uri(contextUrl);
+        return $"{uri.Scheme}://{uri.Host}{serverRelative}";
+    }
+}

SharepointToolbox/Services/UserAccessAuditService.cs

@@ -136,7 +136,10 @@ public class UserAccessAuditService : IUserAccessAuditService
                         AccessType: accessType,
                         GrantedThrough: entry.GrantedThrough,
                         IsHighPrivilege: HighPrivilegeLevels.Contains(trimmedLevel),
-                        IsExternalUser: PermissionEntryHelper.IsExternalUser(login));
+                        IsExternalUser: PermissionEntryHelper.IsExternalUser(login),
+                        TargetUrl: entry.TargetUrl,
+                        TargetLabel: entry.TargetLabel,
+                        SharingLinkType: entry.SharingLinkType);
                 }
             }
         }

SharepointToolbox/SharepointToolbox.csproj

@@ -54,6 +54,14 @@
     <PackageReference Include="LiveChartsCore.SkiaSharpView.WPF" Version="2.0.0-rc5.4" />
     <PackageReference Include="Microsoft.Extensions.Hosting" Version="10.0.0" />
     <PackageReference Include="Microsoft.Graph" Version="5.74.0" />
+    <!-- Override Kiota transitive deps to patch GHSA-7j59-v9qr-6fq9 (NU1903 in <1.20.0) -->
+    <PackageReference Include="Microsoft.Kiota.Abstractions" Version="1.22.2" />
+    <PackageReference Include="Microsoft.Kiota.Authentication.Azure" Version="1.22.2" />
+    <PackageReference Include="Microsoft.Kiota.Http.HttpClientLibrary" Version="1.22.2" />
+    <PackageReference Include="Microsoft.Kiota.Serialization.Form" Version="1.22.2" />
+    <PackageReference Include="Microsoft.Kiota.Serialization.Json" Version="1.22.2" />
+    <PackageReference Include="Microsoft.Kiota.Serialization.Multipart" Version="1.22.2" />
+    <PackageReference Include="Microsoft.Kiota.Serialization.Text" Version="1.22.2" />
     <PackageReference Include="Microsoft.Identity.Client" Version="4.83.3" />
     <PackageReference Include="Microsoft.Identity.Client.Broker" Version="4.82.1" />
     <PackageReference Include="Microsoft.Identity.Client.Extensions.Msal" Version="4.83.3" />

SharepointToolbox/ViewModels/Tabs/PermissionsViewModel.cs

@@ -45,6 +45,15 @@ public partial class PermissionsViewModel : FeatureViewModelBase
     [ObservableProperty]
     private bool _mergePermissions;
 
+    /// <summary>
+    /// When true, the HTML report hides the raw "SharePoint Group: SharingLinks.{guid}…"
+    /// / "Limited Access System Group For Web|List {guid}" text for rows where the
+    /// system-group target was resolved — only the link-type badge and target link are shown.
+    /// Rows whose target could not be resolved still display the raw name as a fallback.
+    /// </summary>
+    [ObservableProperty]
+    private bool _hideSystemGroupRaw = true;
+
     [ObservableProperty]
     private bool _includeSubsites;
 
@@ -498,9 +507,9 @@ public partial class PermissionsViewModel : FeatureViewModelBase
             }
 
             if (IsSimplifiedMode && SimplifiedResults.Count > 0)
-                await _htmlExportService.WriteAsync(SimplifiedResults.ToList(), dialog.FileName, CurrentSplit, CurrentLayout, CancellationToken.None, branding, groupMembers);
+                await _htmlExportService.WriteAsync(SimplifiedResults.ToList(), dialog.FileName, CurrentSplit, CurrentLayout, CancellationToken.None, branding, groupMembers, HideSystemGroupRaw);
             else
-                await _htmlExportService.WriteAsync((IReadOnlyList<PermissionEntry>)Results, dialog.FileName, CurrentSplit, CurrentLayout, CancellationToken.None, branding, groupMembers);
+                await _htmlExportService.WriteAsync((IReadOnlyList<PermissionEntry>)Results, dialog.FileName, CurrentSplit, CurrentLayout, CancellationToken.None, branding, groupMembers, HideSystemGroupRaw);
             OpenFile(dialog.FileName);
         }
         catch (Exception ex)

SharepointToolbox/ViewModels/Tabs/StorageViewModel.cs

@@ -163,15 +163,27 @@ public partial class StorageViewModel : FeatureViewModelBase
     }
 
     // ── Summary properties (computed from root-level library nodes) ─────────
+    //
+    // Recycle-bin contents are rolled into each library's TotalSizeBytes by the
+    // StorageService (matches storman.aspx). Including the synthetic root-level
+    // RecycleBin nodes here would double-count those bytes — filter them out.
+    // SummaryRecycleBinSize below still reads from _allNodes so the bin metric
+    // remains visible to the user.
 
-    /// <summary>Sum of TotalSizeBytes across root-level library nodes.</summary>
-    public long SummaryTotalSize => Results.Where(n => n.IndentLevel == 0).Sum(n => n.TotalSizeBytes);
+    /// <summary>Sum of TotalSizeBytes across root-level non-bin nodes.</summary>
+    public long SummaryTotalSize => Results
+        .Where(n => n.IndentLevel == 0 && n.Kind != StorageNodeKind.RecycleBin)
+        .Sum(n => n.TotalSizeBytes);
 
-    /// <summary>Sum of VersionSizeBytes across root-level library nodes.</summary>
-    public long SummaryVersionSize => Results.Where(n => n.IndentLevel == 0).Sum(n => n.VersionSizeBytes);
+    /// <summary>Sum of VersionSizeBytes across root-level non-bin nodes.</summary>
+    public long SummaryVersionSize => Results
+        .Where(n => n.IndentLevel == 0 && n.Kind != StorageNodeKind.RecycleBin)
+        .Sum(n => n.VersionSizeBytes);
 
-    /// <summary>Sum of TotalFileCount across root-level library nodes.</summary>
-    public long SummaryFileCount => Results.Where(n => n.IndentLevel == 0).Sum(n => n.TotalFileCount);
+    /// <summary>Sum of TotalFileCount across root-level non-bin nodes.</summary>
+    public long SummaryFileCount => Results
+        .Where(n => n.IndentLevel == 0 && n.Kind != StorageNodeKind.RecycleBin)
+        .Sum(n => n.TotalFileCount);
 
     /// <summary>
     /// Aggregate recycle-bin size (stage 1 + stage 2 across all sites). Reads

SharepointToolbox/Views/Tabs/PermissionsView.xaml

@@ -91,7 +91,9 @@
                 DockPanel.Dock="Top" Margin="0,0,0,8" Padding="8">
         <StackPanel>
           <CheckBox Content="{Binding Source={x:Static loc:TranslationSource.Instance}, Path=[chk.merge.permissions]}"
-                    IsChecked="{Binding MergePermissions}" />
+                    IsChecked="{Binding MergePermissions}" Margin="0,0,0,4" />
+          <CheckBox Content="{Binding Source={x:Static loc:TranslationSource.Instance}, Path=[chk.hide.system.group.raw]}"
+                    IsChecked="{Binding HideSystemGroupRaw}" />
         </StackPanel>
       </GroupBox>