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/outline.repo.test.ts

@@ -0,0 +1,50 @@
+import { describe, it, expect, beforeEach, afterEach } from 'vitest'
+import { DatabaseSync } from 'node:sqlite'
+import { migrate } from '../../src/main/db/migrate'
+import { OutlineRepository } from '../../src/main/db/repositories/outline.repo'
+import type { SqliteDb } from '../../src/main/db/types'
+
+describe('OutlineRepository', () => {
+  let db: SqliteDb
+  let repo: OutlineRepository
+
+  beforeEach(() => {
+    db = new DatabaseSync(':memory:')
+    migrate(db)
+    repo = new OutlineRepository(db)
+  })
+
+  afterEach(() => {
+    db.close()
+  })
+
+  it('creates nested outline items', () => {
+    const parent = repo.create(null, '第一幕', 0)
+    const child = repo.create(parent.id, '开端', 0)
+    expect(repo.listTree()).toHaveLength(1)
+    expect(repo.listTree()[0].children).toHaveLength(1)
+    expect(repo.listTree()[0].children![0].id).toBe(child.id)
+  })
+
+  it('lists uncovered items without chapter link', () => {
+    const item = repo.create(null, '未覆盖', 0)
+    repo.update(item.id, { chapterId: null })
+    expect(repo.listUncovered()).toHaveLength(1)
+    expect(repo.listUncovered()[0].id).toBe(item.id)
+  })
+
+  it('deletes parent and cascades children', () => {
+    const parent = repo.create(null, '父节点', 0)
+    repo.create(parent.id, '子节点', 0)
+    repo.delete(parent.id)
+    expect(repo.listFlat()).toHaveLength(0)
+  })
+
+  it('moves item to new parent', () => {
+    const a = repo.create(null, 'A', 0)
+    const b = repo.create(null, 'B', 1)
+    const child = repo.create(a.id, 'child', 0)
+    repo.move(child.id, b.id, 0)
+    expect(repo.get(child.id)!.parentId).toBe(b.id)
+  })
+})