refactor(desktop): IME composition 가드 helper 추출 + 8곳 Enter 핸들러 통합 (빅뱅 Phase 5 Part 5)

Bug 10 fix(MeetingModePage 인라인 가드)를 isImeComposingEvent helper로 추출하고,
한글 위험도 있는 나머지 7개 Enter 핸들러에 일괄 적용. 총 8곳이 이제 동일 helper 경유.

신규:
- apps/desktop/src/renderer/utils/keyboard.ts — isImeComposingEvent(e)
  JSDoc에 Bug 10 원리(Chromium이 IME 조합 중 Enter를 2번 발화) + 권장 사용 패턴 포함

적용 8곳:
- pages/MeetingModePage.tsx:164 회의 메모 (기존 인라인 가드 4줄 교체)
- pages/KnowledgeBasePage.tsx:84 RAG 쿼리
- pages/VoiceConversationPage.tsx:113 텍스트 채팅
- pages/CommandsPage.tsx:336 키워드 추가 (Enter+Esc)
- components/meeting/MeetingChatPanel.tsx:111 미팅 챗
- components/meeting/EditableSegment.tsx:70 전사 세그먼트 편집 (Enter+Esc)
- components/meeting/MeetingDetailTabs.tsx:242 미팅 타이틀 (인라인 arrow → 블록)
- components/shared/HistoryEntryCard.tsx:64 태그 추가 (Enter+Esc)

/simplify 패스 품질 리뷰:
- Phase 3.3 CloudSyncService.pushOne 훅 8곳은 이미 fire-and-forget 1줄로 일관.
  내부 try-catch가 에러 삼켜 로컬 write 차단 금지 철학 준수 → 수정 없음, 현 상태가 최적.

검증:
- desktop tsc --noEmit EXIT=0
- Vite HMR로 dev 프로세스 자동 반영 (재기동 없음)
- 한글 Enter 시연은 사용자 실측 대기 (VoiceConversationPage / MeetingDetailTabs 대표 2곳)

apps/desktop/src/renderer/pages/CommandsPage.tsx

@@ -12,6 +12,7 @@ import PlayArrowIcon from '@mui/icons-material/PlayArrow'
 import LinkIcon from '@mui/icons-material/Link'
 import { MetalCard, PhosphorText, Led, ScreenPanel } from '@d3ro/ui/components/ds'
 import { PageHeader, EmptyStateCard } from '../components/shared'
+import { isImeComposingEvent } from '../utils/keyboard'
 import { d3roPalette, d3roFontMono, d3roTypo, d3roRadius } from '@d3ro/ui/theme'
 import { useI18n } from '@d3ro/i18n'
 import { TemplateSection } from '../components/TemplateSection'
@@ -334,6 +335,7 @@ function VoiceKeywordsSection({ instructions }: { instructions: CustomInstructio
                       value={keywordInput}
                       onChange={(e: React.ChangeEvent<HTMLInputElement>) => setKeywordInput(e.target.value)}
                       onKeyDown={(e: React.KeyboardEvent) => {
+                        if (isImeComposingEvent(e)) return
                         if (e.key === 'Enter') { e.preventDefault(); handleAddKeyword(rule.instructionId, rule.keywords) }
                         if (e.key === 'Escape') { setEditingRule(null); setKeywordInput('') }
                       }}

apps/desktop/src/renderer/pages/KnowledgeBasePage.tsx

@@ -12,6 +12,7 @@ import SendIcon from '@mui/icons-material/Send'
 import DescriptionIcon from '@mui/icons-material/Description'
 import { MetalCard, PhosphorText, Led, PhysicalButton, ScreenPanel } from '@d3ro/ui/components/ds'
 import { PageHeader, EmptyStateCard } from '../components/shared'
+import { isImeComposingEvent } from '../utils/keyboard'
 import { d3roPalette, d3roFontMono, d3roTypo } from '@d3ro/ui/theme'
 import { useI18n } from '@d3ro/i18n'
 import type { RAGDocument, RAGQueryResult, RAGIndexProgress } from '@d3ro/core/types'
@@ -82,6 +83,7 @@ export function KnowledgeBasePage(): React.ReactElement {
   }, [query])
 
   const handleQueryKeyDown = useCallback((e: React.KeyboardEvent) => {
+    if (isImeComposingEvent(e)) return
     if (e.key === 'Enter' && !e.shiftKey) {
       e.preventDefault()
       handleQuery()

apps/desktop/src/renderer/pages/MeetingModePage.tsx

@@ -16,6 +16,7 @@ import { MetalCard, PhosphorText, Led, PhysicalButton, ScreenPanel } from '@d3ro
 import { MeetingDetailTabs } from '../components/meeting/MeetingDetailTabs'
 import { EditableSegment } from '../components/meeting/EditableSegment'
 import { PageHeader, EmptyStateCard } from '../components/shared'
+import { isImeComposingEvent } from '../utils/keyboard'
 import { d3roPalette, d3roFontMono, d3roTypo } from '@d3ro/ui/theme'
 import { useI18n } from '@d3ro/i18n'
 import type {
@@ -163,9 +164,7 @@ export function MeetingModePage(): React.ReactElement {
 
   const handleMemoKeyDown = useCallback(
     (e: React.KeyboardEvent) => {
-      // 한글 IME 조합 중 Enter는 keydown을 2번 발화(조합 확정 + 실제 Enter)하므로
-      // isComposing=true인 이벤트는 무시해 addMemo 중복 호출 방지
-      if (e.nativeEvent.isComposing || e.keyCode === 229) return
+      if (isImeComposingEvent(e)) return
       if (e.key === 'Enter' && !e.shiftKey) {
         e.preventDefault()
         handleAddMemo()

apps/desktop/src/renderer/pages/VoiceConversationPage.tsx

@@ -11,6 +11,7 @@ import DeleteSweepIcon from '@mui/icons-material/DeleteSweep'
 import CancelIcon from '@mui/icons-material/Cancel'
 import { MetalCard, PhosphorText, Led, PhysicalButton, ScreenPanel, InstrumentPanel } from '@d3ro/ui/components/ds'
 import { PageHeader } from '../components/shared'
+import { isImeComposingEvent } from '../utils/keyboard'
 import { d3roPalette, d3roFontMono, d3roTypo } from '@d3ro/ui/theme'
 import { useI18n } from '@d3ro/i18n'
 import type {
@@ -111,6 +112,7 @@ export function VoiceConversationPage(): React.ReactElement {
   }, [])
 
   const handleTextKeyDown = useCallback((e: React.KeyboardEvent) => {
+    if (isImeComposingEvent(e)) return
     if (e.key === 'Enter' && !e.shiftKey) {
       e.preventDefault()
       handleSendText()