feat(chat): add iMessage support

[dhairyashiil]

Fixes - ENG-1172

Video

ScreenRecording_05-01-2026.05-13-11_1.MP4

Summary

• Add env-gated Sendblue iMessage adapter support to the chat app with plain-text command handling and AI replies.
• Add Sendblue-specific text flows for link/unlink, bookings, availability, profile, event types, schedules, booking, cancellation, and rescheduling.
• Add Sendblue Cal.com webhook notification routing and documentation, while ignoring Sendblue group iMessage threads.

Test plan

• bunx biome check apps/chat/.env.example apps/chat/README.md apps/chat/app/api/auth/calcom/callback/route.ts apps/chat/app/api/webhooks/calcom/route.ts apps/chat/app/auth/calcom/complete/page.tsx apps/chat/lib/bot.ts apps/chat/lib/calcom/types.ts apps/chat/lib/env.ts apps/chat/lib/user-linking.ts apps/chat/lib/format-for-sendblue.ts apps/chat/lib/handlers/sendblue.ts apps/chat/package.json
• bun --filter '@calcom/chat' typecheck
• Live Sendblue production smoke test passed for /help, /link, /profile, and /bookings.

Notes

• Uses published chat-adapter-sendblue@0.2.0. That package currently brings a nested chat@4.27.0, so the app contains a narrow adapter-boundary cast until the adapter ships a peer-only Chat SDK dependency.

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Project	Deployment	Actions	Updated (UTC)
cal-companion-chat	Ignored		May 1, 2026 8:57am

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