feat: deliver P2 v0.2.0 with unified editor, search, and snapshots

Implement schema v2 migration, outline/setting/inspiration CRUD, unified TipTap editing, reference panel with mentions, FTS global search, chapter version history, writing landmarks, word frequency analysis, light theme contrast fixes, and full unit/E2E test coverage.

Co-authored-by: Cursor <cursoragent@cursor.com>

tests/main/setting.repo.test.ts

@@ -0,0 +1,47 @@
+import { describe, it, expect, beforeEach, afterEach } from 'vitest'
+import { DatabaseSync } from 'node:sqlite'
+import { migrate } from '../../src/main/db/migrate'
+import { SettingRepository } from '../../src/main/db/repositories/setting.repo'
+import { VolumeRepository } from '../../src/main/db/repositories/volume.repo'
+import { ChapterRepository } from '../../src/main/db/repositories/chapter.repo'
+import type { SqliteDb } from '../../src/main/db/types'
+
+describe('SettingRepository', () => {
+  let db: SqliteDb
+  let repo: SettingRepository
+  let chapterId: string
+
+  beforeEach(() => {
+    db = new DatabaseSync(':memory:')
+    migrate(db)
+    repo = new SettingRepository(db)
+    const vol = new VolumeRepository(db).create('卷一', 0)
+    chapterId = new ChapterRepository(db).create(vol.id, '第一章', 0).id
+  })
+
+  afterEach(() => {
+    db.close()
+  })
+
+  it('creates and lists settings by type', () => {
+    repo.create('character', '林远')
+    repo.create('location', '青云山')
+    expect(repo.list('character')).toHaveLength(1)
+    expect(repo.list('character')[0].name).toBe('林远')
+  })
+
+  it('syncs chapter refs', () => {
+    const setting = repo.create('character', '主角')
+    repo.syncChapterRefs(setting.id, [chapterId])
+    const updated = repo.get(setting.id)!
+    expect(updated.chapterIds).toEqual([chapterId])
+  })
+
+  it('updates and deletes setting', () => {
+    const setting = repo.create('character', '旧名')
+    repo.update(setting.id, { name: '新名' })
+    expect(repo.get(setting.id)!.name).toBe('新名')
+    repo.delete(setting.id)
+    expect(repo.get(setting.id)).toBeNull()
+  })
+})