feat: bulk send templates via csv (#1578)

Implements a bulk send feature allowing users to upload a CSV file to
create multiple documents from a template. Includes CSV template
generation, background processing, and email notifications.

<img width="563" alt="image"
src="https://github.com/user-attachments/assets/658cee71-6508-4a00-87da-b17c6762b7d8"
/>
<img width="578" alt="image"
src="https://github.com/user-attachments/assets/bbfac70b-c6a0-466a-be98-99ca4c4eb1b9"
/>
<img width="635" alt="image"
src="https://github.com/user-attachments/assets/65b2f55d-d491-45ac-84d6-1a31afe953dd"
/>


## Changes Made

- Added `TemplateBulkSendDialog` with CSV upload/download functionality
- Implemented bulk send job handler using background task system
- Created email template for completion notifications
- Added bulk send option to template view and actions dropdown
- Added CSV parsing with email/name validation

## Testing Performed

- CSV upload with valid/invalid data
- Bulk send with/without immediate sending
- Email notifications and error handling
- Team context integration
- File size and row count limits

Resolves #1550

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

@@ -5,7 +5,7 @@ import { useState } from 'react';
 import Link from 'next/link';
 
 import { Trans } from '@lingui/macro';
-import { Copy, Edit, MoreHorizontal, MoveRight, Share2Icon, Trash2 } from 'lucide-react';
+import { Copy, Edit, MoreHorizontal, MoveRight, Share2Icon, Trash2, Upload } from 'lucide-react';
 import { useSession } from 'next-auth/react';
 
 import type { Recipient, Template, TemplateDirectLink } from '@documenso/prisma/client';
@@ -17,6 +17,8 @@ import {
   DropdownMenuTrigger,
 } from '@documenso/ui/primitives/dropdown-menu';
 
+import { TemplateBulkSendDialog } from '~/components/templates/template-bulk-send-dialog';
+
 import { DeleteTemplateDialog } from './delete-template-dialog';
 import { DuplicateTemplateDialog } from './duplicate-template-dialog';
 import { MoveTemplateDialog } from './move-template-dialog';
@@ -86,6 +88,17 @@ export const DataTableActionDropdown = ({
           </DropdownMenuItem>
         )}
 
+        <TemplateBulkSendDialog
+          templateId={row.id}
+          recipients={row.recipients}
+          trigger={
+            <div className="hover:bg-accent hover:text-accent-foreground relative flex cursor-pointer select-none items-center rounded-sm px-2 py-1.5 text-sm outline-none transition-colors">
+              <Upload className="mr-2 h-4 w-4" />
+              <Trans>Bulk Send via CSV</Trans>
+            </div>
+          }
+        />
+
         <DropdownMenuItem
           disabled={!isOwner && !isTeamTemplate}
           onClick={() => setDeleteDialogOpen(true)}