feat: add cancellable document status (#2992)

Adds a CANCELLED envelope status that privileged members (owner or team
admin/manager) can move a pending document into. Sending recipient
notifications via a background job while retaining the document in the
dashboard as proof of distribution.

Includes a dedicated Cancelled tab, single and bulk cancel actions,
the ENVELOPE_CANCELLED mutability guard, and e2e coverage for
permissions
and visibility.

packages/ui/primitives/document-flow/add-subject.tsx

@@ -102,12 +102,14 @@ export const AddSubjectFormPartial = ({
         : msg`Send`,
       [DocumentStatus.COMPLETED]: msg`Update`,
       [DocumentStatus.REJECTED]: msg`Update`,
+      [DocumentStatus.CANCELLED]: msg`Update`,
     },
     [DocumentDistributionMethod.NONE]: {
       [DocumentStatus.DRAFT]: msg`Generate Links`,
       [DocumentStatus.PENDING]: msg`View Document`,
       [DocumentStatus.COMPLETED]: msg`View Document`,
       [DocumentStatus.REJECTED]: msg`View Document`,
+      [DocumentStatus.CANCELLED]: msg`View Document`,
     },
   };