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/MeetingModeService.ts

@@ -211,6 +211,7 @@ class MeetingModeService extends EventEmitter {
         errorMessage: err instanceof Error ? err.message : String(err),
         updatedAt: Date.now(),
       }).where(eq(meetingSessions.id, sessionId)).run()
+      getCloudSyncService().pushOne('meetings', sessionId)
 
       this._setState('idle')
       throw err
@@ -237,7 +238,7 @@ class MeetingModeService extends EventEmitter {
     // Phase 3.3: 부모 meeting row를 즉시 push (빈 상태로).
     // 자식 meeting_memos/meeting_documents의 RLS/FK가 부모 존재를 요구하므로,
     // 녹음 중에 들어오는 addMemo/generateDocument 푸시가 통과하려면 필수.
-    void getCloudSyncService().pushOne('meetings', sessionId)
+    getCloudSyncService().pushOne('meetings', sessionId)
 
     return { sessionId }
   }
@@ -273,7 +274,7 @@ class MeetingModeService extends EventEmitter {
     logger.debug(`메모 추가: [${formatTime(memo.timestampMs)}] ${content}`)
 
     // Phase 3.3: 자동 push (fire-and-forget)
-    void getCloudSyncService().pushOne('meeting_memos', memo.id)
+    getCloudSyncService().pushOne('meeting_memos', memo.id)
 
     return memo
   }
@@ -317,6 +318,7 @@ class MeetingModeService extends EventEmitter {
       durationMs: this._sessionStartedAt ? now - this._sessionStartedAt : 0,
       updatedAt: now,
     }).where(eq(meetingSessions.id, sessionId)).run()
+    getCloudSyncService().pushOne('meetings', sessionId)
 
     logger.info(`회의 녹음 종료: sessionId=${sessionId}, segments=${this._segments.length}`)
 
@@ -339,6 +341,7 @@ class MeetingModeService extends EventEmitter {
         status: 'processing',
         updatedAt: Date.now(),
       }).where(eq(meetingSessions.id, sessionId)).run()
+      getCloudSyncService().pushOne('meetings', sessionId)
 
       // Step 1: 전사 텍스트 합산
       this._sendProgress(sessionId, 'merging', 40)
@@ -355,9 +358,7 @@ class MeetingModeService extends EventEmitter {
         sttModel: configGet('sttModelId') as string | undefined,
         updatedAt: now,
       }).where(eq(meetingSessions.id, sessionId)).run()
-
-      // Phase 3.3: 최종 save 후 자동 push (fire-and-forget)
-      void getCloudSyncService().pushOne('meetings', sessionId)
+      getCloudSyncService().pushOne('meetings', sessionId)
 
       // Step 2.5: 오디오 WAV 파일 저장 (화자 구분용)
       if (this._audioBuffersForFile.length > 0) {
@@ -400,6 +401,7 @@ class MeetingModeService extends EventEmitter {
         errorMessage: err instanceof Error ? err.message : String(err),
         updatedAt: Date.now(),
       }).where(eq(meetingSessions.id, sessionId)).run()
+      getCloudSyncService().pushOne('meetings', sessionId)
 
       this._resetSession()
       this._setState('idle')
@@ -478,7 +480,10 @@ class MeetingModeService extends EventEmitter {
     }
 
     db.delete(meetingMemos).where(eq(meetingMemos.sessionId, sessionId)).run()
+    db.delete(meetingDocuments).where(eq(meetingDocuments.sessionId, sessionId)).run()
     db.delete(meetingSessions).where(eq(meetingSessions.id, sessionId)).run()
+    // 서버는 회의 삭제가 메모·문서로 cascade 된다 — 회의 하나만 지우면 된다.
+    getCloudSyncService().pushDelete('meetings', sessionId)
     logger.info(`회의 세션 삭제: ${sessionId}`)
   }
 
@@ -490,6 +495,7 @@ class MeetingModeService extends EventEmitter {
     }
     db.update(meetingSessions).set({ title, updatedAt: Date.now() })
       .where(eq(meetingSessions.id, sessionId)).run()
+    getCloudSyncService().pushOne('meetings', sessionId)
   }
 
   // ── 내보내기 ──
@@ -649,6 +655,7 @@ class MeetingModeService extends EventEmitter {
       editedTranscript,
       updatedAt: Date.now(),
     }).where(eq(meetingSessions.id, sessionId)).run()
+    getCloudSyncService().pushOne('meetings', sessionId)
     logger.info(`전사 수정 저장: sessionId=${sessionId}`)
   }
 
@@ -733,7 +740,7 @@ class MeetingModeService extends EventEmitter {
     logger.info(`문서 생성 완료: docId=${docId}, sessionId=${params.sessionId}`)
 
     // Phase 3.3: 자동 push (fire-and-forget)
-    void getCloudSyncService().pushOne('meeting_documents', docId)
+    getCloudSyncService().pushOne('meeting_documents', docId)
 
     return {
       id: docId,
@@ -779,6 +786,7 @@ class MeetingModeService extends EventEmitter {
     }
     db.update(meetingDocuments).set({ content, updatedAt: Date.now() })
       .where(eq(meetingDocuments.id, documentId)).run()
+    getCloudSyncService().pushOne('meeting_documents', documentId)
     logger.info(`문서 수정: docId=${documentId}`)
   }
 
@@ -789,6 +797,7 @@ class MeetingModeService extends EventEmitter {
       throw new D3ROError(ErrorCode.MeetingDocumentNotFound, `문서를 찾을 수 없습니다: ${documentId}`)
     }
     db.delete(meetingDocuments).where(eq(meetingDocuments.id, documentId)).run()
+    getCloudSyncService().pushDelete('meeting_documents', documentId)
     logger.info(`문서 삭제: docId=${documentId}`)
   }
 
@@ -1012,6 +1021,7 @@ class MeetingModeService extends EventEmitter {
       editedTranscript: result.text,
       updatedAt: Date.now(),
     }).where(eq(meetingSessions.id, sessionId)).run()
+    getCloudSyncService().pushOne('meetings', sessionId)
 
     logger.info(`Auto Polish 완료: sessionId=${sessionId}`)
     return result.text
@@ -1163,6 +1173,7 @@ ${transcript}`
           editedTranscript: labeledLines.join('\n'),
           updatedAt: Date.now(),
         }).where(eq(meetingSessions.id, sessionId)).run()
+        getCloudSyncService().pushOne('meetings', sessionId)
 
         logger.info(`pyannote 화자 구분 완료: ${diarResult.num_speakers}명, sessionId=${sessionId}`)
       } catch (err) {
@@ -1211,6 +1222,7 @@ ${speakerHint}
       editedTranscript: result.text,
       updatedAt: Date.now(),
     }).where(eq(meetingSessions.id, sessionId)).run()
+    getCloudSyncService().pushOne('meetings', sessionId)
   }
 
   private _buildPdfHtml(session: MeetingSessionDetail): string {