v0.3.1 — live data never freezes

Fix: the dashboard no longer freezes after long uptime (PC + Mac).

One hung report fetch (e.g. a laptop sleep/resume leaving a dead socket) could silently wedge the 10-second refresh loop forever — the app looked alive but every number was frozen until you clicked something. v0.3.1 makes the loop un-wedgeable:

• Every request now has a hard timeout — a dead socket recovers within seconds
• A stuck poll is automatically taken over by the next tick (never blocks the loop)
• The app force-refreshes on wake-from-sleep, screen unlock, window focus/restore, and network reconnect
• Idle dashboards now fully repaint at least once a minute (time-decaying numbers like burn windows never look stale)
• macOS: opted out of App Nap, which could suspend the whole meter in the background
• Server hardening: stalled connections can no longer leak threads; silent background-rebuild failures are now logged

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