Brings in upstream changes:
- Session analysis reports (overview, cost, tokens, tools, git, quality)
- Unified cost calculation with LiteLLM pricing data
- Custom title bar for Linux with native toggle
- Auto-expand AI response groups setting
- MoreMenu toolbar component
- Various fixes (window drag, Ctrl+R, notification guard)
All merge conflicts resolved preserving both fork features (team management,
agent language, fullscreen, diff view) and upstream additions.
06bf5d4381