<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **Chores**
* Improved Electron shutdown, diagnostics and tab teardown for more
reliable exits and forced cleanup on stubborn processes.
* **Tests**
* Added polling-based test helpers, stronger scroll/page readiness,
timeout-tolerant page selection, and async cleanup/worker teardown;
updated many tests to wait for UI/model updates and rendering frames.
* **Bug Fixes**
* Reduced flakiness by awaiting paragraph visibility, nested counts,
selection/navigation stability, tab counts, post-action renders, and
safer element interactions.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
for paragraph blocks, image blocks, list blocks, and table blocks
Should fix#8617 and #11254.
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
- **New Features**
- Added text alignment options (left, center, right) for paragraph,
list, image, note, and table blocks.
- Introduced alignment controls in toolbars and slash menus for easier
formatting.
- Enabled keyboard shortcuts for quick text alignment changes (supports
Mac and Windows).
- **Localization**
- Added English, Simplified Chinese, and Traditional Chinese
translations for new alignment commands and shortcuts.
- **Style**
- Blocks now visually reflect selected text alignment in their layout.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
---------
Co-authored-by: L-Sun <zover.v@gmail.com>
DarkSky