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Lands the user-facing half of the unsubscribe preferences work. The
one-click endpoint already shipped in this PR's main commit; this adds
the proactive self-service path at /dashboard/settings?tab=notifications
so users don't have to wait for a mail to land before tuning their
preferences.
Backend
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New EmailPreferencesController at /api/email/preferences:
GET → returns one row per OPTIONAL_WORKFLOWS entry, each with current
optedOut boolean (false when no DB row exists).
POST → body {workflow, optedOut} flips the row; source='settings_page'
captured for the audit trail.
Auth+payment workflows are deliberately not exposed — the server's
OPTIONAL_WORKFLOWS set stays the single source of truth.
Frontend
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Adds a 'notifications' tab to /dashboard/settings (between 'preferences'
and 'security'). One toggle row per optional workflow with TR copy that
explains what each mail is for. Optimistic update — switch flips
instantly and reverts on failure; PostHog event captures accept/reject.
Static footer note clarifies that auth + payment mail keeps coming
regardless of the switches above (so users don't think they've
unsubscribed from password-reset).
i18n
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Added settings.tabs.notifications + settings.notifications.{title,
description} to both tr.json and en.json. Body copy is hard-coded TR
(matches audit §9.3 #11 TR-only decision).
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>