Consolidate document draft management into updateDocument

Replace the three separate draft mutations (createDraftDocumentVersion,
updateDocumentVersion, deleteDraftDocumentVersion) with automatic draft
lifecycle management inside updateDocument. The backend now auto-creates
a draft when a published document is edited, updates the existing draft
on subsequent edits, and auto-deletes the draft when content reverts to
match the published version.

A new deleteDocumentDraft mutation provides explicit draft deletion.

Backend:
- Merge version-level fields (content, title, classification,
  documentType) into UpdateDocumentRequest
- Convert CreateDraft, UpdateVersion, DeleteDraft into private
  transaction helpers called from Update
- Update returns (*Document, *DocumentVersion, error) with the version
  present only when a draft exists

Frontend:
- Remove all create/update/delete draft mutations from components
- Auto-save via updateDocument with layout refetch on draft status
  transitions while preserving editor cursor (data-generation key)
- Title, type, and classification editable on published versions
  (backend auto-creates draft)
- Forms use react-hook-form values option to stay synced with Relay
  fragment data across draft/publish transitions

API surface (GraphQL, MCP, CLI, n8n) updated consistently:
- Removed: createDraftDocumentVersion, updateDocumentVersion,
  deleteDraftDocumentVersion
- Added: deleteDocumentDraft (document-level)
- Updated: updateDocument accepts content, classification, documentType

Signed-off-by: Sacha Al Himdani <sacha@getprobo.com>

apps/console/src/hooks/graph/DocumentGraph.ts

@@ -16,7 +16,6 @@ import { useTranslate } from "@probo/i18n";
 import { graphql } from "relay-runtime";
 
 import type { DocumentGraphBulkExportDocumentsMutation } from "#/__generated__/core/DocumentGraphBulkExportDocumentsMutation.graphql";
-import type { DocumentGraphDeleteDraftMutation } from "#/__generated__/core/DocumentGraphDeleteDraftMutation.graphql";
 import type { DocumentGraphDeleteMutation } from "#/__generated__/core/DocumentGraphDeleteMutation.graphql";
 import type { DocumentGraphSendSigningNotificationsMutation } from "#/__generated__/core/DocumentGraphSendSigningNotificationsMutation.graphql";
 
@@ -47,29 +46,6 @@ export function useDeleteDocumentMutation() {
   );
 }
 
-const deleteDraftDocumentVersionMutation = graphql`
-  mutation DocumentGraphDeleteDraftMutation(
-    $input: DeleteDraftDocumentVersionInput!
-    $connections: [ID!]!
-  ) {
-    deleteDraftDocumentVersion(input: $input) {
-      deletedDocumentVersionId @deleteEdge(connections: $connections)
-    }
-  }
-`;
-
-export function useDeleteDraftDocumentVersionMutation() {
-  const { __ } = useTranslate();
-
-  return useMutationWithToasts<DocumentGraphDeleteDraftMutation>(
-    deleteDraftDocumentVersionMutation,
-    {
-      successMessage: __("Draft deleted successfully."),
-      errorMessage: __("Failed to delete draft"),
-    },
-  );
-}
-
 const bulkDeleteDocumentsMutation = graphql`
   mutation DocumentGraphBulkDeleteDocumentsMutation(
     $input: BulkDeleteDocumentsInput!