Add troubleshooting infrastructure for non-technical users:
- TroubleshootManager: node offline cards with stepped recovery
guidance, factory reset modal, and detection quality banners
- TooltipManager: first-time feature tooltips with localStorage
persistence, auto-dismiss, and sequential tour
- Onboarding failure guidance: human-readable error messages for
browser compatibility, USB connection, WiFi provisioning, and
node detection failures
- Post-calibration reinforcement card with summary and next steps
- Client-side link health check with auto-recovery
- CSS for offline cards, tooltips, quality banners, and modals
- Script tags wired in index.html for troubleshoot.js and tooltips.js
- 30 tests covering all troubleshooting and tooltip functionality
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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