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/native/__tests__/db.spec.mts

@@ -2,7 +2,7 @@ import { fileURLToPath } from 'node:url';
 
 import test from 'ava';
 
-import { SqliteConnection, ValidationResult } from '../index';
+import { SqliteConnection, ValidationResult } from '../index.js';
 
 test('db validate', async t => {
   const path = fileURLToPath(

packages/frontend/native/__tests__/pool.spec.mts

@@ -1,6 +1,6 @@
 import test from 'ava';
 
-import { DocStoragePool } from '../index';
+import { DocStoragePool } from '../index.js';
 
 test('can batch read/write pool', async t => {
   const pool = new DocStoragePool();