## Summary
- Adds a new right-click context menu option on chat tabs that reorders
tabs so they are grouped by app
- Within each app group the original relative order is preserved, and
app groups appear in the order their first tab was encountered
- The option is disabled when all open tabs belong to the same app
- Includes i18n support (en, pt-BR, zh-CN) and unit tests

Closes #3126

## Test plan
- Right-click on a chat tab and verify the "Group tabs by app" option
appears
- With tabs from multiple apps open, click the option and verify tabs
are reordered by app grouping
- With tabs from only one app, verify the option is disabled
- Run `npm test` — all 1003 tests pass

🤖 Generated with [Claude Code](https://claude.com/claude-code)
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Co-authored-by: Will Chen <7344640+wwwillchen@users.noreply.github.com>
Co-authored-by: Claude <noreply@anthropic.com>