Phase 15.5 구현: 화자 구분 (Speaker Diarization)

- Sidecar: pyannote /diarize 엔드포인트 + requirements.txt 업데이트
- LLM 기반 화자 추정 (Phase 1 — 오디오 보존 없이 전사 텍스트 분석)
- CaptionSegment에 speaker 필드 추가
- EditableSegment: 화자별 색상 바 + 화자 Chip 표시
- TranscriptTab: 화자 구분 버튼 + 진행률
- 설정: HuggingFace 토큰 입력 + Diarization 토글
- IPC: DIARIZE + DIARIZATION_PROGRESS 채널
- 에러코드: 895-897
- 12개 locale i18n

src/renderer/components/meeting/EditableSegment.tsx

@@ -2,10 +2,26 @@
 // Phase 14.5: 전사 세그먼트 인라인 편집 컴포넌트
 
 import { useState, useRef, useCallback } from 'react'
-import { Box, TextField, Tooltip } from '@mui/material'
+import { Box, TextField, Tooltip, Chip } from '@mui/material'
 import { d3roPalette, d3roFontMono } from '../../theme'
 import { useI18n } from '../../i18n'
 
+// Phase 15.5: 화자별 색상 매핑 (d3roPalette SSOT)
+const SPEAKER_COLORS = [
+  d3roPalette.tag.purple,
+  d3roPalette.tag.green,
+  d3roPalette.tag.orange,
+  d3roPalette.tag.red,
+  '#3b82f6',
+]
+
+function getSpeakerColor(speaker: string): string {
+  // "화자 1" → 0, "화자 2" → 1, ...
+  const match = /(\d+)$/.exec(speaker)
+  const idx = match ? (parseInt(match[1], 10) - 1) : 0
+  return SPEAKER_COLORS[idx % SPEAKER_COLORS.length]
+}
+
 interface EditableSegmentProps {
   segmentId: string
   timestamp: number   // ms, 상대 시간
@@ -13,6 +29,7 @@ interface EditableSegmentProps {
   edited: boolean     // 수정 여부
   onEdit: (segmentId: string, newText: string) => void
   readOnly?: boolean
+  speaker?: string
 }
 
 function formatTimestamp(ms: number): string {
@@ -29,6 +46,7 @@ export function EditableSegment({
   edited,
   onEdit,
   readOnly = false,
+  speaker,
 }: EditableSegmentProps): React.ReactElement {
   const { t } = useI18n()
   const [editing, setEditing] = useState(false)
@@ -61,9 +79,20 @@ export function EditableSegment({
     [handleCommit],
   )
 
+  const speakerColor = speaker ? getSpeakerColor(speaker) : undefined
+
   if (editing) {
     return (
-      <Box sx={{ display: 'flex', alignItems: 'flex-start', gap: 1, mb: 0.5 }}>
+      <Box
+        sx={{
+          display: 'flex',
+          alignItems: 'flex-start',
+          gap: 1,
+          mb: 0.5,
+          borderLeft: speakerColor ? `4px solid ${speakerColor}` : undefined,
+          pl: speakerColor ? 0.75 : 0,
+        }}
+      >
         <Box
           component="span"
           sx={{
@@ -125,7 +154,16 @@ export function EditableSegment({
   )
 
   return (
-    <Box sx={{ display: 'flex', alignItems: 'flex-start', gap: 1, mb: 0.5 }}>
+    <Box
+      sx={{
+        display: 'flex',
+        alignItems: 'flex-start',
+        gap: 1,
+        mb: 0.5,
+        borderLeft: speakerColor ? `4px solid ${speakerColor}` : undefined,
+        pl: speakerColor ? 0.75 : 0,
+      }}
+    >
       <Box
         component="span"
         sx={{
@@ -139,6 +177,21 @@ export function EditableSegment({
       >
         {formatTimestamp(timestamp)}
       </Box>
+      {speaker && (
+        <Chip
+          label={speaker}
+          size="small"
+          sx={{
+            fontSize: 10,
+            height: 18,
+            flexShrink: 0,
+            bgcolor: `${speakerColor}22`,
+            color: speakerColor,
+            border: `1px solid ${speakerColor}55`,
+            fontFamily: d3roFontMono,
+          }}
+        />
+      )}
       {edited ? (
         <Tooltip title={t('meeting.modified')} placement="top">
           {textNode}