## Summary
Major overhaul of the `twenty-for-twenty` Resend app to make sync more
reliable, observable, and feature-complete.
### SDK upgrade
- Bumps `twenty-sdk` to `2.0.0` and `twenty-client-sdk` to
`1.23.0-canary.1`
- Pins React back to `^18.2.0` to match the SDK
### Sync engine rewrite
- Splits the single `sync-resend-data` job into 4 staggered cron-driven
logic functions: **Emails**, **Contacts**, **Broadcasts (+ segments +
dependencies)**, **Templates** — each running every 5 minutes on a
different minute offset with per-slot timeouts
- Adds a new `ResendSyncCursor` object + `with-sync-cursor`
orchestration so each step persists its progress, last run timestamp,
and last run status
- Introduces an `INITIAL_SYNC_MODE` app variable +
`resend-initial-sync-mode-monitor` that flips to intermediate sync once
every cursor is empty (intermediate sync only refetches the last 7 days
of emails)
- Stops auto-creating People from Resend contacts; instead backfills
`personId` on Resend contacts/emails by matching existing People by
email
- Renames `on-*-deleted` handlers to `on-*-destroyed` and removes from
Resend on destroy (not soft delete)
- Adds rate-limit retry, paginated `for-each-page`, typed-client, and
existing-IDs lookup helpers
### New objects & fields
- New `ResendTopic` object with relation to `ResendBroadcast` (+
navigation menu item, view, page layout)
- New `ResendSyncCursor` object (step / cursor / last run at / last run
status)
- Adds `html` and `text` fields on `ResendBroadcast`; removes raw
`htmlBody`/`textBody`/`tags` from `ResendEmail`
### New UI
- **Sync Status standalone page** (`ResendSyncStatus` front component +
nav item) showing live cursor / last run state per step
- **Person Resend Email Stats** front component: deliverability rate +
per-status breakdown with progress bars
- **Email Broadcast HTML viewer** front component renders an individual
email against its parent broadcast's HTML; new dedicated **Broadcast
HTML viewer**
- Adds Resend Broadcast record page layout (Home / Preview / Timeline /
Tasks / Notes / Files tabs)
### Tests
- ~25 new unit / integration test files covering sync utilities, cursor
lifecycle, webhook handler, email-stats computation, sync-status page
resolution, and rate-limit retry
- Replaces legacy `fetch-all-paginated` tests with `for-each-page` tests
