feat(core): import progress & perf (#15197)

#### PR Dependency Tree


* **PR #15197** 👈

This tree was auto-generated by
[Charcoal](https://github.com/danerwilliams/charcoal)

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

* **New Features**
* Added a new import pipeline with “plan then commit” batch handling for
Markdown, Notion HTML, Obsidian, and Bear backups.
* Enabled native import sessions with progress, cancellation, and
batch-by-batch committing (including assets, folders, icons, and tags).
  * Added web preflight limits for ZIP and multi-file imports.
* **Bug Fixes**
* Improved import error/warning reporting and continued processing when
some items fail.
* Strengthened snapshot-based file/directory picking to preserve paths.
* **Chores**
  * Updated project packaging/configuration for the new import workflow.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

packages/frontend/apps/electron/src/main/handlers.ts

@@ -7,6 +7,7 @@ import { byokStorageHandlers } from './byok-storage/handlers';
 import { clipboardHandlers } from './clipboard';
 import { configStorageHandlers } from './config-storage';
 import { findInPageHandlers } from './find-in-page';
+import { importHandlers } from './import';
 import { getLogFilePath, logger, revealLogFile } from './logger';
 import { recordingHandlers } from './recording';
 import { checkSource } from './security-restrictions';
@@ -39,6 +40,7 @@ export const allHandlers = {
   updater: updaterHandlers,
   configStorage: configStorageHandlers,
   findInPage: findInPageHandlers,
+  import: importHandlers,
   sharedStorage: sharedStorageHandlers,
   worker: workerHandlers,
   recording: recordingHandlers,

packages/frontend/apps/electron/src/main/import/handlers.ts

@@ -0,0 +1,39 @@
+import type { CreateImportSessionOptions } from '@affine/native';
+import {
+  cancelImportSession,
+  createImportSession,
+  disposeImportSession,
+  nextImportBatch,
+} from '@affine/native';
+
+export const importHandlers = {
+  createImportSession: (
+    event: Electron.IpcMainInvokeEvent,
+    options: CreateImportSessionOptions
+  ) => {
+    void event;
+    return createImportSession({
+      format: options.format,
+      source: options.source,
+      batchLimits: options.batchLimits,
+    });
+  },
+  nextImportBatch: (event: Electron.IpcMainInvokeEvent, sessionId: string) => {
+    void event;
+    return nextImportBatch(sessionId);
+  },
+  cancelImportSession: (
+    event: Electron.IpcMainInvokeEvent,
+    sessionId: string
+  ) => {
+    void event;
+    return cancelImportSession(sessionId);
+  },
+  disposeImportSession: (
+    event: Electron.IpcMainInvokeEvent,
+    sessionId: string
+  ) => {
+    void event;
+    return disposeImportSession(sessionId);
+  },
+};

packages/frontend/apps/electron/src/main/import/index.ts

@@ -0,0 +1 @@
+export { importHandlers } from './handlers';