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>

public/locales/zh-CN/translation.json

@@ -457,5 +457,49 @@
   "submission.setDefault": "设为默认预设",
   "inspiration.selectBook": "关联书籍",
   "inspiration.saved": "灵感已保存",
-  "inspiration.noBooks": "请先创建一本书再保存灵感"
+  "inspiration.noBooks": "请先创建一本书再保存灵感",
+  "bookSettings.title": "书籍设置",
+  "bookSettings.synopsis": "简介",
+  "bookSettings.cover": "封面",
+  "bookSettings.pickCover": "选择封面图片",
+  "bookSettings.noCover": "未设置",
+  "bookSettings.alwaysShowCockpit": "每次打开显示驾驶舱",
+  "bookSettings.dangerZone": "危险操作",
+  "bookSettings.deleteBook": "删除此书",
+  "bookSettings.deleteConfirm": "确定删除「{{name}}」？此操作不可恢复。",
+  "volume.rename": "重命名分卷",
+  "volume.renamePrompt": "分卷名称",
+  "volume.editDescription": "编辑简述",
+  "volume.descriptionPrompt": "分卷简述",
+  "volume.delete": "删除分卷",
+  "volume.deleteConfirm": "确定删除分卷「{{name}}」？",
+  "volume.deleteHasChapters": "分卷内仍有章节，无法删除",
+  "chapter.delete": "删除章节",
+  "chapter.deleteConfirm": "确定删除章节「{{title}}」？",
+  "chapterMeta.title": "章节元数据",
+  "chapterMeta.open": "元数据",
+  "chapterMeta.summary": "章节摘要",
+  "chapterMeta.storyTime": "故事时间",
+  "chapterMeta.wordThreshold": "字数阈值",
+  "chapterMeta.tags": "标签",
+  "chapterMeta.tagPlaceholder": "输入标签",
+  "chapterMeta.addTag": "添加",
+  "chapterMeta.publishedAt": "发布于 {{date}}",
+  "ai.session.rename": "重命名会话",
+  "ai.session.renamePrompt": "会话标题",
+  "ai.session.archive": "归档",
+  "ai.session.unarchive": "取消归档",
+  "ai.session.export": "导出",
+  "ai.session.exportMd": "Markdown (.md)",
+  "ai.session.exportTxt": "纯文本 (.txt)",
+  "ai.session.delete": "删除会话",
+  "ai.session.deleteConfirm": "确定删除会话「{{title}}」？",
+  "ai.session.active": "活跃",
+  "ai.session.archived": "已归档",
+  "focus.toggle": "专注模式",
+  "focus.exit": "退出专注",
+  "tts.started": "开始朗读",
+  "tts.stopped": "已停止朗读",
+  "tts.noText": "没有可朗读的内容",
+  "home.exportAllWave2": "批量导出将在后续版本提供"
 }