feat: CAN sensor remote monitor panel (Issue #681)
Adds standalone vanilla JS/HTML/CSS panel for live CAN sensor monitoring:
- can_monitor_panel.html: 5-card dashboard grid with VESC L/R, Balance,
IMU Attitude (span-2), and Barometer cards
- can_monitor_panel.css: dark-theme styles matching existing panel suite;
bidirectional bars, live-dot flash, stat-grid, responsive layout
- can_monitor_panel.js: rosbridge subscriptions to
/vesc/left/state + /vesc/right/state (RPM bidir bar, current gauge,
voltage/duty/temp stats, fault badge, stale detection)
/saltybot/imu (quaternion→Euler, angular vel, lin accel, cal badge
from orientation_covariance[0], canvas artificial horizon + compass)
/saltybot/balance_state (state badge, motor_cmd bidir bar, PID grid)
/saltybot/barometer (altitude, pressure, temp)
Auto-connect from localStorage, 1 Hz stale checker, msg rate display
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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