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/migrate-v2.test.ts

@@ -0,0 +1,57 @@
+import { describe, it, expect, afterEach } from 'vitest'
+import { DatabaseSync } from 'node:sqlite'
+import { migrate } from '../../src/main/db/migrate'
+import schemaV1 from '../../src/main/db/schema-v1.sql?raw'
+import type { SqliteDb } from '../../src/main/db/types'
+
+function tableExists(db: SqliteDb, name: string): boolean {
+  const row = db.prepare("SELECT name FROM sqlite_master WHERE type='table' AND name=?").get(name)
+  return row != null
+}
+
+describe('migrate v2', () => {
+  let db: SqliteDb
+
+  afterEach(() => {
+    db?.close()
+  })
+
+  it('applies v1 and v2 on fresh database', () => {
+    db = new DatabaseSync(':memory:')
+    migrate(db)
+
+    expect(tableExists(db, 'volumes')).toBe(true)
+    expect(tableExists(db, 'chapters')).toBe(true)
+    expect(tableExists(db, 'outline_items')).toBe(true)
+    expect(tableExists(db, 'settings')).toBe(true)
+    expect(tableExists(db, 'inspiration')).toBe(true)
+    expect(tableExists(db, 'snapshots')).toBe(true)
+    expect(tableExists(db, 'bookmarks')).toBe(true)
+    expect(tableExists(db, 'search_fts')).toBe(true)
+
+    const version = db.prepare('SELECT MAX(version) AS v FROM schema_version').get() as { v: number }
+    expect(version.v).toBe(2)
+  })
+
+  it('migrates existing v1 database to v2', () => {
+    db = new DatabaseSync(':memory:')
+    db.exec(`CREATE TABLE IF NOT EXISTS schema_version (
+      version INTEGER PRIMARY KEY,
+      applied_at TEXT NOT NULL DEFAULT (datetime('now')),
+      description TEXT
+    )`)
+    db.exec(schemaV1)
+    db.prepare('INSERT INTO schema_version (version, description) VALUES (?, ?)').run(1, 'initial schema')
+
+    migrate(db)
+
+    expect(tableExists(db, 'outline_items')).toBe(true)
+    const version = db.prepare('SELECT MAX(version) AS v FROM schema_version').get() as { v: number }
+    expect(version.v).toBe(2)
+
+    const cols = db.prepare('PRAGMA table_info(chapters)').all() as { name: string }[]
+    const colNames = cols.map((c) => c.name)
+    expect(colNames).toContain('publish_status')
+    expect(colNames).toContain('summary')
+  })
+})