feat: add customizable contact double opt-in flow (#350)

* 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>

---------

Co-authored-by: opencode <opencode@anthropic.com>
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

apps/web/prisma/migrations/20260208000100_add_double_opt_in_to_contact_book/migration.sql

@@ -0,0 +1,11 @@
+-- AlterTable
+ALTER TABLE "ContactBook"
+ADD COLUMN "doubleOptInEnabled" BOOLEAN NOT NULL DEFAULT false,
+ADD COLUMN "doubleOptInSubject" TEXT,
+ADD COLUMN "doubleOptInContent" TEXT;
+
+-- Backfill legacy unsubscribed contacts so pending state can rely on NULL
+UPDATE "Contact"
+SET "unsubscribeReason" = 'UNSUBSCRIBED'
+WHERE "subscribed" = false
+  AND "unsubscribeReason" IS NULL;

apps/web/prisma/migrations/20260228100000_add_double_opt_in_from_to_contact_book/migration.sql

@@ -0,0 +1,3 @@
+-- AlterTable
+ALTER TABLE "ContactBook"
+ADD COLUMN "doubleOptInFrom" TEXT;