feat(w2): ship v1.3.0 project pack UI, preload, and E2E

Wire .novel/.novel-all export-import through modals, settings backup, and home bulk export with progress IPC.

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

public/locales/zh-CN/translation.json

@@ -442,6 +442,43 @@
   "export.preview": "预览",
   "export.loading": "加载中…",
   "export.noPreview": "（无预览）",
+  "export.kind": "导出类型",
+  "export.kindSubmission": "投稿格式（当前章节）",
+  "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",
+  "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",
+  "pack.exportAllDesc": "将所有书籍与全局设置打包为 .novel-all 文件。",
+  "pack.estimating": "正在估算大小…",
+  "pack.estimatedSize": "预计大小：{{size}}",
+  "pack.noDest": "未选择保存路径",
+  "pack.pickDest": "选择保存位置",
+  "pack.largeExportConfirm": "导出体积较大（{{size}}），确认继续？",
+  "pack.exportAllStart": "开始导出",
+  "pack.exportAllSuccess": "全部书籍已导出",
+  "pack.exportAllFailed": "导出失败",
+  "pack.exportBookSuccess": "「{{name}}」已导出为项目包",
+  "pack.exportBookFailed": "项目包导出失败",
+  "pack.exporting": "导出中…",
+  "pack.cancel": "取消",
+  "pack.progress": "进度 {{current}}/{{total}}",
+  "pack.importStrategy": "导入策略",
+  "pack.strategyNew": "全部作为新书导入",
+  "pack.strategySkip": "跳过已存在的书",
+  "pack.strategyOverwrite": "覆盖同名书籍",
+  "pack.importAllSuccess": "导入完成：新增 {{imported}}，跳过 {{skipped}}，覆盖 {{overwritten}}",
+  "backup.desc": "将书籍导出为笔临项目包，便于备份、迁移或在其他设备恢复。",
+  "backup.exportCurrentBook": "导出当前书籍",
+  "backup.exportBookBtn": "导出为 .novel",
+  "backup.exportAllBooks": "导出全部书籍",
+  "backup.exportAllBtn": "打开批量导出",
+  "backup.noBook": "请先在编辑器中打开一本书",
+  "backup.openBookHint": "在编辑器中打开书籍后可导出单书项目包",
+  "backup.exportBookSuccess": "「{{name}}」已导出",
+  "backup.exportBookFailed": "导出失败",
+  "backup.formatHint": "超过 500 MB 的批量导出需要额外确认。",
   "submission.title": "投稿预设",
   "submission.titleFormat": "标题格式",
   "submission.indent": "段首空两格",