feat: ship v1.2.0 Wave 1 foundation with book settings, chapter management, and focus mode

Deliver schema v9, book/chapter IPC extensions, BookSettingsTab, chapter meta/tags,
AI session menu, focus mode and TTS, template context enrich, and Wave 1 E2E coverage.

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

tests/main/chapter-tag.repo.test.ts

@@ -0,0 +1,35 @@
+import { describe, it, expect, beforeEach, afterEach } from 'vitest'
+import { mkdtempSync, rmSync } from 'fs'
+import { join } from 'path'
+import { tmpdir } from 'os'
+import { openBookDb, closeAllBookDbs } from '../../src/main/db/connection'
+import { migrate } from '../../src/main/db/migrate'
+import { ChapterRepository } from '../../src/main/db/repositories/chapter.repo'
+import { ChapterTagRepository } from '../../src/main/db/repositories/chapter-tag.repo'
+import { VolumeRepository } from '../../src/main/db/repositories/volume.repo'
+
+describe('ChapterTagRepository', () => {
+  let dir: string
+
+  beforeEach(() => {
+    dir = mkdtempSync(join(tmpdir(), 'bilin-tag-'))
+  })
+
+  afterEach(() => {
+    closeAllBookDbs()
+    rmSync(dir, { recursive: true, force: true })
+  })
+
+  it('IT-TAG-01: set and list chapter tags', () => {
+    const db = openBookDb(join(dir, 'test.sqlite'))
+    migrate(db)
+    const volId = new VolumeRepository(db).create('第一卷', 0).id
+    const chId = new ChapterRepository(db).create(volId, '第一章', 0).id
+    const tags = new ChapterTagRepository(db)
+    tags.set(chId, '高潮', '#ff0000')
+    tags.set(chId, '女主主场')
+    expect(tags.list(chId)).toHaveLength(2)
+    tags.remove(chId, '高潮')
+    expect(tags.list(chId)).toHaveLength(1)
+  })
+})