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

packages/lib/package.json

@@ -40,6 +40,7 @@
     "@trigger.dev/sdk": "^2.3.18",
     "@upstash/redis": "^1.20.6",
     "@vvo/tzdb": "^6.117.0",
+    "csv-parse": "^5.6.0",
     "inngest": "^3.19.13",
     "kysely": "^0.26.3",
     "luxon": "^3.4.0",