fix(workflow): ADR-021 code review fixes (8 bugs)

- fix(transmittal): guard duplicate workflow instance on submit()
- fix(workflow-guard): add organizationId to context so Level-2 RBAC works
- fix(circulation): organizationId context passed relation object not INT FK
- fix(transmittal): require Idempotency-Key header on POST submit endpoint
- fix(workflow): userId non-optional in processTransition controller
- fix(circulation): auto-close counts PENDING and IN_PROGRESS tasks
- fix(transmittal): status badge uses workflowState/DRAFT not purpose field
- fix(workflow): log cache invalidation failures instead of swallowing
- fix(workflow): implement getAvailableActions endpoint stub
- fix(i18n): add removeFile key to EN/TH locales

frontend/app/(dashboard)/transmittals/[uuid]/page.tsx

@@ -60,7 +60,9 @@ export default function TransmittalDetailPage() {
 
   const transmittalDocNo = transmittal.correspondence?.correspondenceNumber ?? transmittal.transmittalNo ?? '';
   const transmittalSubject = transmittal.subject ?? '';
-  const transmittalStatus = transmittal.purpose ?? '';
+  const transmittalStatus = transmittal.workflowInstanceId
+    ? (transmittal.workflowState ?? 'SUBMITTED')
+    : 'DRAFT';
 
   return (
     <section className="space-y-4">

frontend/components/workflow/workflow-lifecycle.tsx

@@ -294,7 +294,7 @@ export function WorkflowLifecycle({
                     type="button"
                     className="ml-0.5 hover:text-destructive"
                     onClick={(e) => { e.stopPropagation(); removeUploadedFile(f.publicId); }}
-                    aria-label={t('workflow.timeline.uploadError')}
+                    aria-label={t('workflow.timeline.removeFile')}
                   >
                     <XIcon className="h-3 w-3" />
                   </button>

frontend/public/locales/en/common.json

@@ -29,6 +29,7 @@
   "workflow.timeline.uploading": "Uploading...",
   "workflow.timeline.uploadTypes": "PDF, DOCX, XLSX, DWG, ZIP · Max 50 MB",
   "workflow.timeline.uploadError": "Unable to upload",
+  "workflow.timeline.removeFile": "Remove file",
 
   "filePreview.fallbackTitle": "File",
   "filePreview.fileUnavailable": "File has been removed from storage.",

frontend/public/locales/th/common.json

@@ -29,6 +29,7 @@
   "workflow.timeline.uploading": "กำลังอัปโหลด...",
   "workflow.timeline.uploadTypes": "PDF, DOCX, XLSX, DWG, ZIP · สูงสุด 50 MB",
   "workflow.timeline.uploadError": "ไม่สามารถอัปโหลด",
+  "workflow.timeline.removeFile": "ลบไฟล์",
 
   "filePreview.fallbackTitle": "ไฟล์",
   "filePreview.fileUnavailable": "ไฟล์ถูกลบออกจาก Storage แล้ว",