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Area: All pages with data fetching

When the backend is unreachable (network offline, server down), users see generic error messages with no recovery path. There is no graceful degradation or cached fallback.

Fix:

• Add a global network error boundary that catches fetch failures
• Show an "Offline" banner when navigator.onLine is false
• On reconnect, auto-retry failed queries
• Cache last-known values from React Query so the UI isn't completely blank