feat(desktop): two-way cloud sync with mobile and web

Rewrites the desktop mirror as services/sync/SyncEngine: a persistent
outbox, per-account server-clock keyset cursors with paging, pulls that never
overwrite unsent local edits, deletions both ways through sync_tombstones and
per-row failure isolation. It now covers history titles and favorites,
dictionary, every meeting's memos and documents, memo tags, user commands and
dictation/meeting templates, and registers the desktop as a device that the
phone can disconnect.

Fixes shipped defects: the first pull after sign-in fetched nothing, only
the first meeting's children were pushed, team meetings leaked into the
personal database and lost team_id on re-push, and Realtime never connected
because Electron's Node 20 has no global WebSocket (ws is now the transport).
Anonymous local-mode records are imported into the first account that signs
in. The settings sync section is translated and shows pending/rejected
changes; synced screens reload on app:dataChanged.

apps/desktop/src/main/services/sync/realtime-transport.ts

@@ -0,0 +1,10 @@
+// src/main/services/sync/realtime-transport.ts
+// Electron 33 메인 프로세스(Node 20)에는 전역 WebSocket이 없어 Supabase Realtime이 연결하지 못한다.
+// ws는 브라우저 WebSocket API와 호환되지만 이벤트 핸들러 선언이 달라 타입만 한 번 맞춘다.
+
+import WebSocket from 'ws'
+import type { SupabaseClientOptions } from '@supabase/supabase-js'
+
+type RealtimeTransport = NonNullable<NonNullable<SupabaseClientOptions<'public'>['realtime']>['transport']>
+
+export const nodeRealtimeTransport = WebSocket as unknown as RealtimeTransport