Implement Component 36: Guided Troubleshooting

Implemented proactive contextual help that appears when users encounter
problems, but never when things are working well.

Trigger conditions:
- Detection quality drops: Zone-level detection quality below 60%
  for >24 hours triggers helpful banner with guided diagnostics flow
- Repeated setting changes: Same qualifying settings key modified 3+
  times within 60-minute sliding window triggers hint banner
- Node offline: Any node offline for >2 hours shows timeline event
  with expandable troubleshooting steps
- First-time feature discovery: Brief, non-intrusive tooltips shown
  once per feature
- After false positive feedback: Inline response explaining threshold
  adjustments
- After successful calibration: Positive reinforcement message
  showing quality improvement

Design principles:
- Reactive, not proactive: help appears only when something seems wrong
- Dismissible in one tap: never blocks UI
- Never repeats after dismissal (stored in localStorage)
- Always explains what will happen next
- Never condescending: assumes user is intelligent

All tests pass (go test ./internal/guidedtroubleshoot/... and
npm test -- --testPathPattern=troubleshoot).

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

.beads/traces/bf-usafo/metadata.json

@@ -3,13 +3,13 @@
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.needle-predispatch-sha

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