feat: logs tab overhaul — severity tags, filtering, recovery durations
Logs tab visual overhaul:
- Severity-classified entries: DOWN (red), UP (green), WARN (amber),
SYS (cyan), info (gray) — rendered as inline tags, not whole-line color
- Column-aligned format: [timestamp] [severity tag] [message]
- Filter toggle (f key): All vs Important only (hides retry noise)
- Header shows entry count, filter state, hidden count
Engine log improvements:
- Recovery messages include downtime duration ("was down 14m")
- LATE transition logged ("heartbeat overdue")
- Push monitor recovery includes downtime duration
lerko
b14d5e19db