v0.121.0: Thinking duration, smoother scrollback, better session titles, and stability fixes

New features

- Thinking duration - CLI and app now show how long a droid spent thinking
- Scroll to most recent prompt - You can now scroll down directly to the most recent prompt in the CLI

Improvements

- Smoother transcript scrollback - Cached static transcript markdown rendering for faster scrolling
- Better session titles - Session titles are now well-formed, with redundant syncs deduplicated
- Tighter /sessions layout - Column widths in /sessions are now distributed more evenly
- Faster setup failure feedback - Setup now fails fast with a clearer error when the daemon can't connect

Bug fixes

- Pasting long blocks - Fixed issues when pasting large blocks of text into the CLI
- ACP tool call lifecycle - Repaired the tool call lifecycle for ACP sessions
- Droid binary download - Fixed an installation error when downloading the droid binary on some systems
- Droid Computer reconnection - Droid Computers now reconnect automatically on activity (Factory App)
- Clearer daemon error messages - Improved daemon error messaging in the Factory App