Productivity features, UI translations, local email translation

- Snooze (with a Snoozed folder), keyboard shortcuts with a Settings
  section, mail templates (Compose > More > Templates), a Subscriptions
  folder with bulk unsubscribe/delete, and tracker blocking with a
  Privacy toggle (on by default)
- Own dialogs instead of browser popups; emoji picker in compose; compose
  windows survive a visit to Settings
- Sentence completion learned from the user's sent mail (no AI)
- Interface in English and Polish (one file per language, English as the
  fallback), picked from the browser on first run, then kept
- Email translation on the server via LibreTranslate: Translate button
  and "Translate to...", messages in several languages translated part
  by part, names/addresses/emoji/file names/phone numbers kept, an
  animated line while translating
- Antispam "Mark as spam" loads with the message, not when the menu opens

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

backend/workers/run.py

@@ -27,6 +27,7 @@ from arq.worker import Worker
 from app.config import get_settings
 from app.indexer.gc import sweep_job
 from app.queue import QUEUE_BULK, QUEUE_INTERACTIVE, redis_settings
+from app.snooze import wake_due_job
 from app.sync.actions import autopurge_trash_spam
 from app.sync.coordinator import SyncCoordinator
 from workers.worker import BULK_FUNCTIONS, INTERACTIVE_FUNCTIONS
@@ -34,7 +35,9 @@ from workers.worker import BULK_FUNCTIONS, INTERACTIVE_FUNCTIONS
 # Core scheduled jobs. Daily Trash/Spam retention purge at 03:17 (off-peak, and a
 # minute that won't collide with typical top-of-hour crons); then the clean-up of
 # stored files nothing uses any more (the purge's among them) at 03:47.
+# Snoozed conversations are checked every minute (cheap: a partial index).
 _CORE_CRON_JOBS = [
+    cron(wake_due_job, second=5),
     cron(autopurge_trash_spam, hour=3, minute=17),
     cron(sweep_job, hour=3, minute=47, timeout=3600),
 ]