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

package-lock.json

@@ -13836,6 +13836,12 @@
       "resolved": "https://registry.npmjs.org/csstype/-/csstype-3.1.2.tgz",
       "integrity": "sha512-I7K1Uu0MBPzaFKg4nI5Q7Vs2t+3gWWW648spaF+Rg7pI9ds18Ugn+lvg4SHczUdKlHI5LWBXyqfS8+DufyBsgQ=="
     },
+    "node_modules/csv-parse": {
+      "version": "5.6.0",
+      "resolved": "https://registry.npmjs.org/csv-parse/-/csv-parse-5.6.0.tgz",
+      "integrity": "sha512-l3nz3euub2QMg5ouu5U09Ew9Wf6/wQ8I++ch1loQ0ljmzhmfZYrH9fflS22i/PQEvsPvxCwxgz5q7UB8K1JO4Q==",
+      "license": "MIT"
+    },
     "node_modules/cytoscape": {
       "version": "3.28.1",
       "resolved": "https://registry.npmjs.org/cytoscape/-/cytoscape-3.28.1.tgz",
@@ -35031,6 +35037,7 @@
         "@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",