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/components/meeting/EditableSegment.tsx

@@ -5,6 +5,7 @@ import { useState, useRef, useCallback } from 'react'
 import { Box, TextField, Tooltip, Chip } from '@mui/material'
 import { d3roPalette, d3roFontMono } from '@d3ro/ui/theme'
 import { useI18n } from '@d3ro/i18n'
+import { isImeComposingEvent } from '../../utils/keyboard'
 
 // Phase 15.5: 화자별 색상 매핑 (d3roPalette SSOT)
 const SPEAKER_COLORS = [
@@ -69,6 +70,7 @@ export function EditableSegment({
 
   const handleKeyDown = useCallback(
     (e: React.KeyboardEvent) => {
+      if (isImeComposingEvent(e)) return
       if (e.key === 'Enter' && !e.shiftKey) {
         e.preventDefault()
         handleCommit()

apps/desktop/src/renderer/components/meeting/MeetingChatPanel.tsx

@@ -9,6 +9,7 @@ import ExpandLessIcon from '@mui/icons-material/ExpandLess'
 import ExpandMoreIcon from '@mui/icons-material/ExpandMore'
 import { PhosphorText } from '@d3ro/ui/components/ds'
 import { PhysicalButton } from '@d3ro/ui/components/ds'
+import { isImeComposingEvent } from '../../utils/keyboard'
 import { d3roPalette, d3roFontMono, d3roTypo, d3roShadow } from '@d3ro/ui/theme'
 import { useI18n } from '@d3ro/i18n'
 import type { MeetingChatMessage } from '@d3ro/core/types'
@@ -110,6 +111,7 @@ export function MeetingChatPanel({ sessionId }: MeetingChatPanelProps): React.Re
 
   const handleKeyDown = useCallback(
     (e: React.KeyboardEvent<HTMLInputElement>) => {
+      if (isImeComposingEvent(e)) return
       if (e.key === 'Enter' && !e.shiftKey) {
         e.preventDefault()
         handleSend()

apps/desktop/src/renderer/components/meeting/MeetingDetailTabs.tsx

@@ -19,6 +19,7 @@ import { DocumentTab } from './DocumentTab'
 import { AddDocumentDialog } from './AddDocumentDialog'
 import { MeetingChatPanel } from './MeetingChatPanel'
 import { PhosphorText } from '@d3ro/ui/components/ds'
+import { isImeComposingEvent } from '../../utils/keyboard'
 import { d3roPalette, d3roFontMono, d3roTypo } from '@d3ro/ui/theme'
 import { useI18n } from '@d3ro/i18n'
 import type {
@@ -239,7 +240,10 @@ export function MeetingDetailTabs({
               size="small"
               value={titleDraft}
               onChange={(e) => setTitleDraft(e.target.value)}
-              onKeyDown={(e) => e.key === 'Enter' && handleSaveTitle()}
+              onKeyDown={(e) => {
+                if (isImeComposingEvent(e)) return
+                if (e.key === 'Enter') handleSaveTitle()
+              }}
               sx={{
                 flex: 1,
                 '& .MuiInputBase-root': { fontFamily: d3roFontMono, fontSize: d3roTypo.compact.size },

apps/desktop/src/renderer/components/shared/HistoryEntryCard.tsx

@@ -14,6 +14,7 @@ import { MetalCard, Led } from '@d3ro/ui/components/ds'
 import { d3roPalette, d3roFontMono, d3roTypo, d3roRadius } from '@d3ro/ui/theme'
 import { useI18n } from '@d3ro/i18n'
 import { formatDuration } from '../../utils/formatters'
+import { isImeComposingEvent } from '../../utils/keyboard'
 import type { HistoryEntry, MemoTag, MeetingSummaryResult } from '@d3ro/core/types'
 
 interface HistoryEntryCardProps {
@@ -62,6 +63,7 @@ export function HistoryEntryCard({ entry, onCopy, onDelete, showTags = false, on
   }, [entry.id])
 
   const handleTagKeyDown = useCallback((e: React.KeyboardEvent) => {
+    if (isImeComposingEvent(e)) return
     if (e.key === 'Enter') { e.preventDefault(); handleAddTag() }
     if (e.key === 'Escape') { setShowTagInput(false); setTagInput('') }
   }, [handleAddTag])