v0.2.8

:sparkles: Replace curl with reqwest for cross-platform upgrade

- Use reqwest + rustls-tls for HTTP (no system curl dependency)
- Add indicatif progress bar with ETA/speed display
- Replace self-replace with rename-based safe binary replacement
- Add curl -# progress bar to install.sh
- Backup old binaries to ~/.sugg/.old/ instead of scattered .old files