[CLAUDE] Contract: K4a+K4b SP-002 sidebar 8 nhom x 6 leaf + noi ?group= end-to-end (0-mig)

K4a (gate PASS-WITH-FLAGS 4, sub-reviewer-gate-k4a.md): 49 key Khkk_G{2-8} bo-sinh
by-construction 3-phia (All/seed/grant) MenuKeys.cs + DbInitializer 49 row + labelBackfill
G1 nhan A1 + site-2 Concat + va 7/10/11/13/15 (nhan N2 co "pha do"; comment 1893 -> mo-neo
grep). All 64->113, Policies 256->452 (test T2 khoa runtime). Test +7 KhkkGroupMenuSeedTests
(T7 revoker-khong-dung-Khkk: probe vi-phan 112->0, gotcha #84).

K4b (gate PASS-WITH-FLAGS 4M/5m 0-chan, sub-reviewer-gate-k4b.md): KhkkListPage x2 derive
phase+group tu searchParams (leaf->leaf khong F5, navKey reset) + queryKey {group,phase,
search,page,deletedView} + KhkkCreatePage preset ?group= + staticMap G1 6-leaf group=1 +
regex Khkk_G([1-8])_* fe-user (fe-admin GHI RANG BUOC isAdminHidden) + FLAG-1 lead-fix:
GET /deleted +group mirror List (Controller+Query+handler SAU-IDOR) + FE noi 2-nhanh.

2 wave 1 commit CO KHAI: Layout.tsx dinh ca 2 wave khong tach hunk phi-tuong-tac; moi dong
deu qua gate rieng. STATUS canonical 5-row dong bo (71/97/452/113/620->621) + bundle :479.
No K4c: MAJOR-A test /deleted+group filter + MAJOR-C WfView doc group. Suite 621/0
(45D+576I) + filter 41/41 + npm x2 + dotnet 0E.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/Backend/SolutionErp.Application/ContractSigningPlans/ContractSigningPlanFeatures.cs

@@ -862,7 +862,10 @@ public class GetMyContractSigningPlanInboxQueryHandler(IApplicationDbContext db,
 }
 
 /// Màn "Đã xoá" — CHỈ XEM (mirror `ListDeletedPurchaseEvaluationsQuery`).
-public record ListDeletedContractSigningPlansQuery
+// [K4b S166 — gate-K4b FLAG-1] +ApprovalGroup mirror list SỐNG (`:756-757`): 8 leaf "Đã xóa"
+// per-nhóm trỏ `?group=n` mà endpoint này không đọc ⇒ 8 URL trả CÙNG tập mọi-nhóm; lọc client-side
+// thì total/số-trang nói dối (server đếm trên tập chưa lọc) ⇒ phải lọc server-side như list sống.
+public record ListDeletedContractSigningPlansQuery(int? ApprovalGroup = null)
     : PagedRequest, IRequest<PagedResult<ContractSigningPlanListItemDto>>;
 
 public class ListDeletedContractSigningPlansQueryHandler(IApplicationDbContext db, ICurrentUser currentUser)
@@ -889,6 +892,10 @@ public class ListDeletedContractSigningPlansQueryHandler(IApplicationDbContext d
                     && userWfIds.Contains(p.ApprovalWorkflowId.Value)));
         }
 
+        // [K4b S166] Lọc nhóm — mirror list sống `:756-757`, SAU vế IDOR (lọc chỉ thu hẹp).
+        if (request.ApprovalGroup is not null)
+            q = q.Where(p => p.ApprovalGroup == request.ApprovalGroup);
+
         if (!string.IsNullOrWhiteSpace(request.Search))
         {
             var kw = request.Search.Trim();