Phase 5 구현: SQLite DB + History/Dictionary 서비스 + UI

- DB: better-sqlite3 + drizzle-orm (history/dictionary/stats, WAL 모드)
- HistoryService: CRUD + 검색 + 통계 + 30일 보존 정책, 세션 완료 시 자동 저장
- DictionaryService: CRUD + 검색 + 사용 횟수 추적 + STT 프롬프트 힌트
- HistoryPage: 목록 + 검색 + 삭제 + 복사 + 페이지네이션
- DictionaryPage: 목록 + 검색 + 추가 다이얼로그 + 삭제
- DashboardPage: 실데이터 통계 (총/오늘 세션, 시간, 단어수, 연속일수)
- IPC: history/dictionary/stats 핸들러 + preload API
- Bootstrap: DB 초기화 (critical) + 이력 자동 저장 연동

src/main/bootstrap.ts

@@ -6,6 +6,8 @@ import { initConfigService } from './services/ConfigService'
 import { getHotkeyService } from './services/HotkeyService'
 import { getVoiceModeService } from './services/VoiceModeService'
 import { getLocalLLMService } from './services/LocalLLMService'
+import { getHistoryService } from './services/HistoryService'
+import { initDatabase } from './db'
 import {
   createMainWindow,
   preloadPopupWindows,
@@ -30,6 +32,7 @@ export async function bootstrap(): Promise<void> {
   const steps: BootstrapStep[] = [
     { name: 'logger', critical: false, fn: initLogger },
     { name: 'config', critical: false, fn: initConfig },
+    { name: 'database', critical: true, fn: initDB },
     { name: 'create-windows', critical: true, fn: createWindows },
     { name: 'tray', critical: false, fn: initTray },
     { name: 'ipc-handlers', critical: true, fn: initIpcHandlers },
@@ -65,6 +68,10 @@ async function initConfig(): Promise<void> {
   initConfigService()
 }
 
+async function initDB(): Promise<void> {
+  initDatabase()
+}
+
 async function createWindows(): Promise<void> {
   createMainWindow()
 }
@@ -106,11 +113,26 @@ async function initVoiceMode(): Promise<void> {
     }
   })
 
-  voiceMode.on('session-completed', ({ finalText }) => {
+  voiceMode.on('session-completed', ({ session, finalText }) => {
     hideRecordingTip()
     if (finalText.length > 0) {
       showResultPopup(finalText)
     }
+
+    // 이력 저장
+    try {
+      const wordCount = finalText.split(/\s+/).filter((w) => w.length > 0).length
+      getHistoryService().create({
+        originalText: session.transcription || finalText,
+        polishedText: session.processedText,
+        mode: session.mode === 'hands-free' ? 'dictation' : session.mode,
+        status: 'completed',
+        duration: (Date.now() - session.startedAt) / 1000,
+        wordCount
+      })
+    } catch (error) {
+      logger.warn(`Failed to save history: ${error instanceof Error ? error.message : String(error)}`)
+    }
   })
 
   voiceMode.on('session-cancelled', () => {