fix tenant account unbind flow

server/internal/tenant/app/desktop_account_service_test.go

@@ -13,9 +13,12 @@ import (
 )
 
 type desktopAccountRepoSpy struct {
-	markDesktopID   uuid.UUID
-	markWorkspaceID int64
-	markUserID      int64
+	markDesktopID             uuid.UUID
+	markWorkspaceID           int64
+	markUserID                int64
+	tombstoneActorDesktopID   uuid.UUID
+	tombstoneActorWorkspaceID int64
+	tombstoneActorUserID      int64
 }
 
 func (r *desktopAccountRepoSpy) ListByClient(context.Context, int64, uuid.UUID) ([]repository.DesktopAccount, error) {
@@ -46,6 +49,24 @@ func (r *desktopAccountRepoSpy) Tombstone(context.Context, uuid.UUID, int64, uui
 	return nil, nil
 }
 
+func (r *desktopAccountRepoSpy) TombstoneForActor(_ context.Context, desktopID uuid.UUID, workspaceID, userID int64) (*repository.DesktopAccount, error) {
+	r.tombstoneActorDesktopID = desktopID
+	r.tombstoneActorWorkspaceID = workspaceID
+	r.tombstoneActorUserID = userID
+	now := time.Date(2026, 6, 18, 9, 45, 0, 0, time.UTC)
+	return &repository.DesktopAccount{
+		DesktopID:   desktopID,
+		TenantID:    10,
+		WorkspaceID: workspaceID,
+		UserID:      userID,
+		Platform:    "baijiahao",
+		PlatformUID: "351884467",
+		DisplayName: "Media Account",
+		Health:      "live",
+		DeletedAt:   &now,
+	}, nil
+}
+
 func (r *desktopAccountRepoSpy) MarkDeleteRequested(_ context.Context, desktopID uuid.UUID, workspaceID, userID int64) (*repository.DesktopAccount, error) {
 	r.markDesktopID = desktopID
 	r.markWorkspaceID = workspaceID