fix: recipients with CC role not being editable (#918)

## Description

Fixed issue where setting a recipient role as CC will prevent any
further changes as it is considered as "sent" and "signed".

## Other changes

- Prevent editing document after completed
- Removed CC and Viewers from the field recipient list since they will
never be filled
- Minor UI issues

## Checklist

- [X] I have tested these changes locally and they work as expected.
- [X] I have added/updated tests that prove the effectiveness of these
changes.
- [X] I have followed the project's coding style guidelines.

apps/web/src/app/(dashboard)/documents/data-table-action-dropdown.tsx

@@ -114,7 +114,7 @@ export const DataTableActionDropdown = ({ row, team }: DataTableActionDropdownPr
       <DropdownMenuContent className="w-52" align="start" forceMount>
         <DropdownMenuLabel>Action</DropdownMenuLabel>
 
-        {recipient?.role !== RecipientRole.CC && (
+        {recipient && recipient?.role !== RecipientRole.CC && (
           <DropdownMenuItem disabled={!recipient || isComplete} asChild>
             <Link href={`/sign/${recipient?.token}`}>
               {recipient?.role === RecipientRole.VIEWER && (