Use `last_active` from SQLite (max message timestamp) for accurate
sorting, with fallback chain: last_active → ended_at → started_at.
CLI mode lacks last_active so falls back to ended_at.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
The PR changed `.active` class to bind on `isSessionLive()`, which
removed the visual selection state when clicking a non-live session.
Split into two classes: `.active` for selection, `.live` for streaming.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
- Add Japanese, Korean, French, Spanish, German, Portuguese translations
- Improve session active state visibility in both themes
- Static language labels in LanguageSwitch component
- Dark theme: lighten chat input background for better contrast
- Fix system theme listener not toggling back to light
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>