feat(w3): ship v1.4.0 export matrix, cockpit tasks, and focus ambient

Add ExportMatrixService for txt/md/docx/pdf, extend ExportModal, cockpit outline tasks, focus ambient sound, and E2E-PDF-01 with 134 passing unit tests.

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

public/locales/zh-CN/translation.json

@@ -221,6 +221,8 @@
   "cockpit.resumeEdit": "继续写作",
   "cockpit.bridgeCheck": "章间衔接检查",
   "cockpit.forgottenForeshadow": "查看遗忘伏笔",
+  "cockpit.todayOutlineTasks": "今日大纲任务",
+  "cockpit.outlineTargetWords": "目标 {{count}} 字",
   "cockpit.todayProgress": "今日 {{current}} / {{goal}} 字",
   "cockpit.streak": "连更 {{days}} 天",
   "cockpit.heatmap": "写作热力图",
@@ -272,6 +274,7 @@
   "settings.pomodoroDuration": "番茄钟时长（分钟）",
   "settings.systemNotifications": "启用系统通知",
   "settings.goalNotifications": "启用目标达成提醒",
+  "settings.focusAmbientSound": "专注模式环境音效",
   "bridge.title": "章间衔接",
   "bridge.loading": "分析中…",
   "bridge.previousTail": "上一章末尾",
@@ -447,6 +450,19 @@
   "export.kindNovel": "笔临项目包 (.novel)",
   "export.novelDesc": "导出整本书的数据库、元数据与附件，可在其他设备或备份后通过「导入书籍」恢复。",
   "export.exportNovel": "导出项目包",
+  "export.kindMatrix": "常规导出（txt/md/docx/pdf）",
+  "export.matrixFormat": "文件格式",
+  "export.matrixScope": "导出范围",
+  "export.matrixOptions": "导出选项",
+  "export.scopeChapter": "当前章节",
+  "export.scopeVolume": "当前分卷",
+  "export.scopeBook": "全书",
+  "export.optionAnnotations": "包含批注/地标",
+  "export.optionAiMark": "标注 AI 生成内容",
+  "export.matrixStart": "导出文件",
+  "export.matrixSaved": "已保存至 {{path}}",
+  "export.matrixFailed": "导出失败",
+  "export.exporting": "导出中…",
   "import.novelHint": "将导入 .novel 项目包中的整本书（含章节、设定与知识库）。",
   "import.novelAllHint": "将批量导入 .novel-all 包中的所有书籍，请选择冲突处理策略。",
   "pack.exportAllTitle": "导出所有书籍",