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/ipc/dictionary-handlers.ts

@@ -0,0 +1,56 @@
+// src/main/ipc/dictionary-handlers.ts
+
+import { ipcMain } from 'electron'
+import { IPC_CHANNELS } from '@shared/ipc-channels'
+import { ipcSuccess, ipcError, ErrorCode } from '@shared/errors'
+import { getDictionaryService } from '../services/DictionaryService'
+import type {
+  DictionaryQueryParams,
+  DictionaryAddParams,
+  DictionaryUpdateParams,
+  DictionaryDeleteParams,
+  DictionarySearchParams
+} from '@shared/types'
+
+export function registerDictionaryHandlers(): void {
+  ipcMain.handle(IPC_CHANNELS.DICTIONARY.GET_ALL, async (_event, params: DictionaryQueryParams) => {
+    try {
+      return ipcSuccess(getDictionaryService().list(params))
+    } catch {
+      return ipcError(ErrorCode.DBQueryFailed, 'Failed to get dictionary')
+    }
+  })
+
+  ipcMain.handle(IPC_CHANNELS.DICTIONARY.ADD, async (_event, params: DictionaryAddParams) => {
+    try {
+      return ipcSuccess(getDictionaryService().add(params))
+    } catch {
+      return ipcError(ErrorCode.DBWriteFailed, 'Failed to add dictionary entry')
+    }
+  })
+
+  ipcMain.handle(IPC_CHANNELS.DICTIONARY.UPDATE, async (_event, params: DictionaryUpdateParams) => {
+    try {
+      return ipcSuccess(getDictionaryService().update(params))
+    } catch {
+      return ipcError(ErrorCode.DBWriteFailed, 'Failed to update dictionary entry')
+    }
+  })
+
+  ipcMain.handle(IPC_CHANNELS.DICTIONARY.DELETE, async (_event, params: DictionaryDeleteParams) => {
+    try {
+      getDictionaryService().delete(params.id)
+      return ipcSuccess(undefined)
+    } catch {
+      return ipcError(ErrorCode.DBWriteFailed, 'Failed to delete dictionary entry')
+    }
+  })
+
+  ipcMain.handle(IPC_CHANNELS.DICTIONARY.SEARCH, async (_event, params: DictionarySearchParams) => {
+    try {
+      return ipcSuccess(getDictionaryService().search(params))
+    } catch {
+      return ipcError(ErrorCode.DBQueryFailed, 'Failed to search dictionary')
+    }
+  })
+}