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/shared/HistoryEntryCard.tsx

@@ -3,7 +3,7 @@
 
 import React, { useState, useEffect, useCallback } from 'react'
 import { Box, IconButton, Tooltip, Chip, Collapse } from '@mui/material'
-import { Copy, Check, Trash2, Tag, X, ScrollText, ChevronDown, Sparkles, Volume2 } from 'lucide-react'
+import { Copy, Check, Trash2, Tag, X, ScrollText, ChevronDown, Sparkles, Volume2, Star } from 'lucide-react'
 import { MetalCard, Led, TactileBadge } from '@d3ro/ui/components/ds'
 import { d3roPalette, d3roFontSans, d3roFontMono, d3roTypo, d3roRadius, d3roShadow } from '@d3ro/ui/theme'
 import { useI18n } from '@d3ro/i18n'
@@ -15,6 +15,8 @@ export interface HistoryEntryCardProps {
   entry: HistoryEntry
   onCopy?: (text: string) => void
   onDelete?: (id: string) => void
+  /** 즐겨찾기 토글 — 모바일·웹과 공유되는 값 */
+  onToggleFavorite?: (entry: HistoryEntry) => void
   showTags?: boolean
   onTagClick?: (tag: string) => void
 }
@@ -23,6 +25,7 @@ export function HistoryEntryCard({
   entry,
   onCopy,
   onDelete,
+  onToggleFavorite,
   showTags = false,
   onTagClick,
 }: HistoryEntryCardProps): React.ReactElement {
@@ -160,6 +163,27 @@ export function HistoryEntryCard({
 
             {/* Quick Action Buttons */}
             <Box sx={{ display: 'flex', alignItems: 'center', gap: 0.5, flexShrink: 0 }}>
+              {onToggleFavorite && (
+                <Tooltip title={entry.isFavorite ? t('history.unfavorite') : t('history.favorite')}>
+                  <IconButton
+                    size="small"
+                    aria-pressed={entry.isFavorite}
+                    aria-label={entry.isFavorite ? t('history.unfavorite') : t('history.favorite')}
+                    onClick={(e) => {
+                      e.stopPropagation()
+                      onToggleFavorite(entry)
+                    }}
+                    sx={{
+                      p: 0.6,
+                      color: entry.isFavorite ? d3roPalette.tag.orange : d3roPalette.text.inactive,
+                      bgcolor: entry.isFavorite ? d3roPalette.tag.orangeBg : 'transparent',
+                      '&:hover': { color: d3roPalette.tag.orange, bgcolor: d3roPalette.tag.orangeBg },
+                    }}
+                  >
+                    <Star size={14} fill={entry.isFavorite ? 'currentColor' : 'none'} />
+                  </IconButton>
+                </Tooltip>
+              )}
               <Tooltip title={copied ? t('common.copied') : t('common.copy')}>
                 <IconButton
                   size="small"