feat: WebUI event log panel (Issue #576)
Standalone 3-file filterable real-time event log (no build step).
Files:
ui/event_log_panel.html — layout, toolbar, empty state
ui/event_log_panel.js — rosbridge subscriptions, ring buffer, render
ui/event_log_panel.css — dark-theme, responsive grid layout
Features:
- 1000-entry ring buffer (oldest dropped when full, FIFO)
- Subscribes /rosout (rcl_interfaces/msg/Log) + /saltybot/events (std_msgs/String JSON)
- Severity filter buttons: DEBUG / INFO / WARN / ERROR / FATAL / EVENT (toggle on/off)
- Node name filter: select dropdown populated from seen nodes
- Live text search with <mark> highlight, Ctrl+F shortcut, Esc to clear
- Auto-scroll to latest entry; pauses on mouse hover (messages still buffered)
- Manual pause/resume button; detects user scroll-up and stops auto-scroll
- CSV export of current filtered view with timestamp (filename includes ISO date)
- Clear all entries button
- Color-coded by severity: left border stripe + text color per level
- Entry columns: timestamp (ms precision) | severity | node | message
- [system] entries for connect/disconnect events
- WS URL persisted in localStorage
- Responsive: node column hidden on narrow screens
ROS topics:
SUB /rosout rcl_interfaces/msg/Log (all nodes)
SUB /saltybot/events std_msgs/String (JSON: {level,node,msg})
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
sl-webui
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