Original changelog解決剛啟動時燃燒速度警告誤判的問題
**Burn-rate warning false positives**: after v0.6.6 shipped, real-world testing showed the red warning firing at 1% / 14% / 36% used right after restart, because a 2-point slope based on only 2-3 fresh samples is unstable and low-percent forecasts have huge headroom regardless. Fix adds two guardrails: forecasting only runs when the last-10-minute window holds ≥ 5 samples spanning ≥ 5 minutes; the warning only replaces the reset line when the current percent is ≥ 50%. Otherwise the original "Resets in X" text stays.