feat(core): onenote importer (#15198)

#### PR Dependency Tree


* **PR #15198** 👈

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 OneNote import support for `.one`, `.onetoc2`, and `.onepkg`,
including OneNote-to-markdown content conversion.
* OneNote now appears in the import flow with a dedicated label and
format tooltip, and file pickers recognize the new OneNote type.

* **Bug Fixes**
* Import options that are desktop-only are now disabled when not running
in the desktop app, with clear messaging.
* Improved imported asset handling by converting non-image embedded
assets into attachments for more consistent results.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

blocksuite/affine/shared/src/utils/file/filesys.ts

@@ -120,6 +120,12 @@ const FileTypes: NonNullable<OpenFilePickerOptions['types']> = [
         ['.docx'],
     },
   },
+  {
+    description: 'OneNote',
+    accept: {
+      'application/onenote': ['.one', '.onetoc2', '.onepkg'],
+    },
+  },
   {
     description: 'MindMap',
     accept: {
@@ -140,6 +146,7 @@ type AcceptTypes =
   | 'Html'
   | 'Zip'
   | 'Docx'
+  | 'OneNote'
   | 'MindMap';
 
 type OpenFileOptions = {