- Replace polling-based auth detection with event-based subscription
- Remove unnecessary 100ms delay on desktop (keep 50ms for mobile)
- Unify dashboard data fetching to prevent duplicate API calls
- Use Promise.all for parallel maintenance schedule fetching
Reduces dashboard load time from ~1.5s to <500ms.
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>