## Summary
- Add right-click context menu to chat tabs with options: Close tab,
Close other tabs, Close tabs to the right, Close all tabs
- Track which chats were opened in the current session via
`sessionOpenedChatIdsAtom` - only tabs explicitly opened this session
are shown
- Add `context-menu.tsx` UI component from shadcn/ui with Radix UI
dependency
- Add translations for context menu items (en, pt-BR, zh-CN)

## Test plan
- [x] Unit tests added for `getOrderedRecentChatIds` with session
filtering
- [x] Unit tests added for `closeMultipleTabsAtom`
- [x] E2E tests added for context menu interactions (close other tabs,
close tabs to right, close all)
- [ ] Manual testing: right-click a chat tab and verify context menu
appears with all options
- [ ] Manual testing: verify "Close other tabs" closes all tabs except
the clicked one
- [ ] Manual testing: verify "Close tabs to the right" closes only tabs
to the right
- [ ] Manual testing: verify "Close all" closes all tabs

🤖 Generated with [Claude Code](https://claude.com/claude-code)
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---------
Co-authored-by: Will Chen <willchen90@gmail.com>
Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>