Contacts:
- Contact groups/lists with JMAP members map and composer expansion
- vCard import/export with RFC 6350 parser and duplicate detection
- Bulk operations (multi-select, delete, group add, export)
Search:
- Advanced search panel with JMAP filter fields
- Search chips for active filters visualization
- Debounced inputs with AbortController deduplication
Vacation:
- JMAP VacationResponse singleton management
- Settings tab with date range and message configuration
- Sidebar indicator when vacation responder is active
Auth:
- TOTP 2FA support with Stalwart-compatible password$totp format
Infrastructure:
- Docker multi-stage build with standalone Next.js output
- Structured server-side logger with text/JSON format
- CSP Report-Only and security headers via proxy middleware
- Layout refactoring (HTML structure in root layout)
- Playwright E2E framework setup
Testing: 450+ tests (identity, contacts, vCard, threads, headers, components)
i18n: All new strings added to all 8 locales
