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/renderer/components/meeting/MeetingDetailTabs.tsx

@@ -134,10 +134,16 @@ export function MeetingDetailTabs({
     [detail.rawTranscript, detail.editedTranscript],
   )
 
-  // 템플릿 로드
+  // 템플릿 로드 (다른 기기에서 바뀐 템플릿이 반영되면 다시)
   useEffect(() => {
-    window.electronAPI.meetingDocTemplate.getAll().then((resp) => {
-      if (resp.success) setTemplates(resp.data)
+    const load = (): void => {
+      window.electronAPI.meetingDocTemplate.getAll().then((resp) => {
+        if (resp.success) setTemplates(resp.data)
+      })
+    }
+    load()
+    return window.electronAPI.app.onDataChanged((data) => {
+      if (data.type === 'cloud-sync' && data.entities?.includes('user_templates')) load()
     })
   }, [])