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/db/schema.ts

@@ -0,0 +1,83 @@
+// src/main/db/schema.ts
+// 설계서 03의 drizzle-orm 스키마 정의
+
+import { sqliteTable, text, integer, real, index, uniqueIndex } from 'drizzle-orm/sqlite-core'
+
+// ── history ──────────────────────────────────────────────
+export const history = sqliteTable(
+  'history',
+  {
+    id: text('id').primaryKey(),
+    originalText: text('original_text').notNull(),
+    polishedText: text('polished_text'),
+    focusedApp: text('focused_app'),
+    focusedAppName: text('focused_app_name'),
+    focusedAppWindowTitle: text('focused_app_window_title'),
+    mode: text('mode', { enum: ['dictation', 'translate', 'command'] })
+      .notNull()
+      .default('dictation'),
+    status: text('status', { enum: ['completed', 'cancelled', 'error'] })
+      .notNull()
+      .default('completed'),
+    errorCode: text('error_code'),
+    audioLocalPath: text('audio_local_path'),
+    duration: real('duration').notNull(),
+    detectedLanguage: text('detected_language'),
+    micDevice: text('mic_device'),
+    wordCount: integer('word_count').notNull().default(0),
+    sttModel: text('stt_model'),
+    llmModel: text('llm_model'),
+    sttLatencyMs: integer('stt_latency_ms'),
+    llmLatencyMs: integer('llm_latency_ms'),
+    createdAt: integer('created_at').notNull(),
+    updatedAt: integer('updated_at').notNull(),
+    appVersion: text('app_version').notNull().default('1.0.0')
+  },
+  (table) => [
+    index('idx_history_created_at').on(table.createdAt),
+    index('idx_history_status').on(table.status),
+    index('idx_history_detected_language').on(table.detectedLanguage),
+    index('idx_history_focused_app_name').on(table.focusedAppName),
+    index('idx_history_mode').on(table.mode)
+  ]
+)
+
+// ── dictionary ───────────────────────────────────────────
+export const dictionary = sqliteTable(
+  'dictionary',
+  {
+    id: text('id').primaryKey(),
+    word: text('word').notNull(),
+    pronunciation: text('pronunciation'),
+    category: text('category', { enum: ['user', 'auto', 'technical'] })
+      .notNull()
+      .default('user'),
+    usageCount: integer('usage_count').notNull().default(0),
+    lastUsedAt: integer('last_used_at'),
+    createdAt: integer('created_at').notNull(),
+    updatedAt: integer('updated_at').notNull()
+  },
+  (table) => [
+    uniqueIndex('idx_dictionary_word_category').on(table.word, table.category),
+    index('idx_dictionary_created_at').on(table.createdAt),
+    index('idx_dictionary_usage_count').on(table.usageCount)
+  ]
+)
+
+// ── stats ────────────────────────────────────────────────
+export const stats = sqliteTable('stats', {
+  id: integer('id').primaryKey(),
+  totalDuration: real('total_duration').notNull().default(0),
+  totalWords: integer('total_words').notNull().default(0),
+  sessionCount: integer('session_count').notNull().default(0),
+  streakDays: integer('streak_days').notNull().default(0),
+  lastSessionAt: integer('last_session_at'),
+  lastUpdated: integer('last_updated').notNull()
+})
+
+// ── 타입 추출 ────────────────────────────────────────────
+export type History = typeof history.$inferSelect
+export type NewHistory = typeof history.$inferInsert
+export type Dictionary = typeof dictionary.$inferSelect
+export type NewDictionary = typeof dictionary.$inferInsert
+export type Stats = typeof stats.$inferSelect