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/i18n/src/i18n-completenesses.json

@@ -3,25 +3,25 @@
   "ca": 92,
   "da": 4,
   "de": 100,
-  "el-GR": 91,
+  "el-GR": 90,
   "en": 100,
   "es-AR": 91,
   "es-CL": 92,
   "es": 91,
-  "fa": 91,
+  "fa": 90,
   "fr": 95,
   "hi": 1,
   "it": 92,
-  "ja": 91,
+  "ja": 90,
   "kk": 98,
   "ko": 91,
   "nb-NO": 45,
   "pl": 92,
-  "pt-BR": 91,
+  "pt-BR": 90,
   "ru": 93,
   "sv-SE": 91,
   "tr": 98,
-  "uk": 91,
+  "uk": 90,
   "ur": 98,
   "zh-Hans": 100,
   "zh-Hant": 93