* feat: add customizable contact double opt-in flow
* test: add double opt-in service coverage
* fix: address review comments for double opt-in PR
- Make pending status conditional on doubleOptInEnabled flag
- Backfill legacy unsubscribeReason for reliable pending detection
- Add doubleOptInContent to contact book listing select
- Fix duplicate toast on DOI editor subject save failure
- Harden searchParams parsing against string[] values
- Make default DOI template use link mark for clickable URL
- Make public API create+update atomic via transaction
- Prevent contact upsert failure when DOI email send fails
- Fix empty string template variable replacement
Co-authored-by: opencode <opencode@anthropic.com>
* fix: harden double opt-in confirmation safeguards
Preserve explicit unsubscribe intent in DOI flows and prevent confirmation links from re-subscribing opted-out contacts. Also sanitize subscribe-page error messaging and use timing-safe hash comparison for link verification.
* ui stuff
* fix: require doubleOptInUrl in double opt-in templates
* feat: add configurable from address for double opt-in emails
* feat: add resend confirmation flow for pending contacts
* fix: move subscribe confirmation to explicit POST flow
* test: add contact book public API endpoint coverage
* docs: add double opt-in documentation and update OpenAPI spec
Add a user guide for the double opt-in feature covering setup, contact
statuses, email customization, template variables, and best practices.
Update the OpenAPI spec to include doubleOptIn fields in all contactBook
request/response schemas.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Co-authored-by: opencode <opencode@anthropic.com>
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
KM Koushik