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>

src/shared/electron-api.d.ts

@@ -59,6 +59,7 @@ import type {
   ImportExecuteParams,
   ImportSplitMode
 } from './types'
+import type { PackImportStrategy, PackImportReport, PackProgressEvent } from './novel-pack'
 
 export interface ElectronAPI {
   window: {
@@ -445,6 +446,17 @@ export interface ElectronAPI {
     copyClipboard: (text: string) => Promise<IpcResult<void>>
     saveTxt: (text: string, defaultName: string) => Promise<IpcResult<string | null>>
   }
+  pack: {
+    pickFile: (
+      mode: 'novel' | 'novel-all' | 'save-novel' | 'save-all' | 'import'
+    ) => Promise<IpcResult<string | null>>
+    exportBook: (bookId: string, destPath: string) => Promise<IpcResult<void>>
+    importBook: (filePath: string) => Promise<IpcResult<string>>
+    exportAll: (destPath: string) => Promise<IpcResult<void>>
+    importAll: (filePath: string, strategy: PackImportStrategy) => Promise<IpcResult<PackImportReport>>
+    estimateExportAll: () => Promise<IpcResult<{ bytes: number; needsConfirm: boolean }>>
+    cancel: () => Promise<IpcResult<void>>
+  }
   bridge: {
     get: (
       bookId: string,
@@ -471,6 +483,7 @@ export interface ElectronAPI {
   onPomodoroTick: (callback: (state: PomodoroState) => void) => () => void
   onGoalNotification: (callback: (payload: GoalNotificationPayload) => void) => () => void
   onImportProgress: (callback: (payload: { current: number; total: number }) => void) => () => void
+  onPackProgress: (callback: (payload: PackProgressEvent) => void) => () => void
 }
 
 declare global {