- NotificationBell.svelte: bell icon in header with unread badge, dropdown showing last 10 notifications, mark-all-read, click-outside close, keyboard Escape support, polls every PUBLIC_NOTIFICATION_POLL_MS ms
- Wire NotificationBell into +layout.svelte between ThemeToggle and UserMenu (authenticated users only)
- Profile page: add notification preferences card with notifyOnReply / notifyOnMention toggles, loaded via GET and saved via PUT /api/users/me/notification-preferences
- i18n: de/en/es message keys for bell, notifications list, and preference labels
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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