Add search UI, virtual scrolling, IndexedDB caching, and offline mode

Shipped: March 14, 2026 at 9:26 PM UTC
Author: kamo
Commit: a947a3c

- Add SearchBar with operator autocomplete, saved/recent search suggestions - Add AdvancedSearchPanel with structured field-based query builder - Add VirtualMessageList using @tanstack/react-virtual for large mailboxes - Add EmailCacheService (IndexedDB) with 6 stores and 100MB LRU body cache - Add useSyncEngine hook for delta sync with interval polling - Add offline detection, service worker, outbox queue with auto-flush - Add usePrefetch hook for background body prefetching (next 5 messages) - Add OfflineBanner component with pending outbox count - Integrate cache-first reads, prefetching, and virtual list into MessageBrowser

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