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-renderer/src/app/native-import.ts

@@ -0,0 +1,15 @@
+import { registerNativeImportSessionHandlers } from '@affine/core/modules/import';
+import { apis } from '@affine/electron-api';
+
+const importApis = apis?.import;
+
+if (importApis) {
+  registerNativeImportSessionHandlers({
+    createImportSession: options =>
+      importApis.createImportSessionFromSource(options),
+    nextImportBatch: sessionId => importApis.nextImportBatch(sessionId),
+    cancelImportSession: sessionId => importApis.cancelImportSession(sessionId),
+    disposeImportSession: sessionId =>
+      importApis.disposeImportSession(sessionId),
+  });
+}

packages/frontend/apps/electron-renderer/src/app/setup.ts

@@ -2,6 +2,7 @@ import '@affine/core/bootstrap/electron';
 import '@affine/core/bootstrap/cleanup';
 import '@affine/component/theme';
 import './global.css';
+import './native-import';
 
 import { apis } from '@affine/electron-api';
 import { bindNativeDBApis } from '@affine/nbstore/sqlite';