[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.Api/Controllers/ContractSigningPlansController.cs

@@ -55,16 +55,17 @@ public class ContractSigningPlansController(
     public async Task<ActionResult<List<ContractSigningPlanListItemDto>>> Inbox(CancellationToken ct)
         => Ok(await mediator.Send(new GetMyContractSigningPlanInboxQuery(), ct));
 
-    /// Màn "Đã xoá" — CHỈ XEM.
+    /// Màn "Đã xoá" — CHỈ XEM. [K4b S166] +`group` mirror List `:42` (8 leaf Đã-xóa per-nhóm).
     [HttpGet("deleted")]
     [Authorize(Policy = "KeHoachKyKet.Read")]
     public async Task<ActionResult<PagedResult<ContractSigningPlanListItemDto>>> ListDeleted(
+        [FromQuery(Name = "group")] int? group = null,
         [FromQuery] int page = 1,
         [FromQuery] int pageSize = 20,
         [FromQuery] string? search = null,
         [FromQuery] bool sortDesc = true,
         CancellationToken ct = default)
-        => Ok(await mediator.Send(new ListDeletedContractSigningPlansQuery
+        => Ok(await mediator.Send(new ListDeletedContractSigningPlansQuery(group)
         { Page = page, PageSize = pageSize, Search = search, SortDesc = sortDesc }, ct));
 
     /// Picker màn tạo: phiếu Duyệt NCC đã duyệt, có NCC trúng thầu, chưa có kế hoạch sống.