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- Auto-poll every 15s when sync is running, 60s when idle - Live status banner: running (with city/step), error list, weekend window waiting, connection error - Highlight active city card and currently-running step with pulse animation - Send immediate error email per failed step (not just at session end) - Expose syncStatus/currentActivity/inWeekendWindow in API response - Stop silently swallowing fetch/action errors — show them in the UI Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>