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/en/translation.json

@@ -221,6 +221,8 @@
   "cockpit.resumeEdit": "Resume writing",
   "cockpit.bridgeCheck": "Chapter bridge check",
   "cockpit.forgottenForeshadow": "Forgotten foreshadows",
+  "cockpit.todayOutlineTasks": "Today's outline tasks",
+  "cockpit.outlineTargetWords": "Target {{count}} words",
   "cockpit.todayProgress": "Today {{current}} / {{goal}} words",
   "cockpit.streak": "{{days}}-day streak",
   "cockpit.heatmap": "Writing heatmap",
@@ -272,6 +274,7 @@
   "settings.pomodoroDuration": "Pomodoro duration (minutes)",
   "settings.systemNotifications": "Enable system notifications",
   "settings.goalNotifications": "Enable goal notifications",
+  "settings.focusAmbientSound": "Focus mode ambient sound",
   "bridge.title": "Chapter bridge",
   "bridge.loading": "Analyzing…",
   "bridge.previousTail": "Previous chapter ending",
@@ -447,6 +450,19 @@
   "export.kindNovel": "Bilin project pack (.novel)",
   "export.novelDesc": "Export the full book database, metadata, and attachments. Restore via Import Book.",
   "export.exportNovel": "Export project pack",
+  "export.kindMatrix": "Standard export (txt/md/docx/pdf)",
+  "export.matrixFormat": "File format",
+  "export.matrixScope": "Export scope",
+  "export.matrixOptions": "Options",
+  "export.scopeChapter": "Current chapter",
+  "export.scopeVolume": "Current volume",
+  "export.scopeBook": "Entire book",
+  "export.optionAnnotations": "Include annotations/landmarks",
+  "export.optionAiMark": "Mark AI-generated content",
+  "export.matrixStart": "Export file",
+  "export.matrixSaved": "Saved to {{path}}",
+  "export.matrixFailed": "Export failed",
+  "export.exporting": "Exporting…",
   "import.novelHint": "Imports the entire book from a .novel pack (chapters, settings, knowledge).",
   "import.novelAllHint": "Imports all books from a .novel-all pack. Choose a conflict strategy.",
   "pack.exportAllTitle": "Export all books",