Add Apple Shortcuts-based SMS sending flow

[siwenshao]

Summary

• Adds a text job API (POST /api/text-jobs, GET /api/text-jobs/:id) that stores message + recipients in MongoDB with a 1-hour TTL
• On the review page, sending a text now creates a job and shows an "Open in Shortcuts" deep link instead of calling Twilio
• The iPhone Shortcut fetches pre-personalized messages from the job endpoint and sends each via the native Messages app
• This is the iCloud link: https://www.icloud.com/shortcuts/2d8c00d353364154af8d06e24d464e5c

How it works

1. User composes message and selects recipients in the web app

2. "Send Text" creates a job on the backend and returns a `shortcuts://` deep link 3. User opens the link on Apple device → Shortcut fetches `GET /api/text-jobs/:id` → sends each `{to, body}` via Messages app

Notes

• GET /api/text-jobs/:id is intentionally unauthenticated — the UUID job ID acts as the credential (same pattern as Google share links)
• {{First Name}} personalization is resolved server-side per recipient before the Shortcut fetches
• NEXT_PUBLIC_SHORTCUT_API_URL can be set independently of NEXT_PUBLIC_API_URL (e.g. to an ngrok URL for local testing)

Testing

• Send a text from the review page — "Open in Shortcuts" button appears after clicking Send
• Open the Shortcut link on iPhone — Shortcuts app opens and runs automatically
• Each recipient receives a correctly personalized message
• Navigating away and back resets the Shortcuts button (no stale job URL)
• Deselecting recipients and resending uses the updated recipient list

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Project	Deployment	Actions	Updated (UTC)
home-start	Ready	Preview, Comment	Jun 4, 2026 9:17pm

[njbizzle]

Tested it on a few old scam texts and it works great!

[navyaa31]

looks good to me! thank you so much for implementing this and for the idea!

[github-actions]

Visit the preview URL for this PR (updated for commit 1b036bf):

https://home-start-80e0a--pr79-feature-textsending-oxt2f6pp.web.app

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