- scanner.py: re-raise nmap exceptions so they reach ScanRun.error
(previously silently returned [] hiding the root cause)
- Sidebar: after triggering scan, auto-switch to History tab
- ScanHistoryPanel: auto-refresh every 3s while any run is 'running';
show error toast when a run transitions running→error; show spinner
on running runs; error message fully visible (no truncation)
- scripts/run_scan.py: standalone scan script to run with sudo for
nmap OS detection / SYN scans on macOS