fix: keep growth analysis available per terminal

internal/growth/analytics_test.go

@@ -63,6 +63,26 @@ func TestBuildForecastReturnsOrderedNinetyDayIntegerRanges(t *testing.T) {
 	}
 }
 
+func TestBuildForecastUsesLimitedHistoryWithLowConfidence(t *testing.T) {
+	start := date("2026-07-01")
+	history := make([]DailyPoint, 0, 14)
+	for daysAgo := 14; daysAgo > 0; daysAgo-- {
+		day := start.AddDate(0, 0, -daysAgo)
+		value := int64(80 + int(day.Weekday())*5)
+		history = append(history, DailyPoint{Date: day, SessionCount: value, PaidSessionCount: value, PaidAmountRial: value * 100_000})
+	}
+
+	forecast := BuildForecast(history, nil, start, 90)
+	if forecast.Confidence != ConfidenceLow || len(forecast.Points) != 90 {
+		t.Fatalf("limited history should produce a low-confidence forecast: confidence=%s points=%d", forecast.Confidence, len(forecast.Points))
+	}
+	for _, point := range forecast.Points {
+		if point.PaidSessions.P10 > point.PaidSessions.P50 || point.PaidSessions.P50 > point.PaidSessions.P90 {
+			t.Fatalf("limited-history range is unordered: %+v", point.PaidSessions)
+		}
+	}
+}
+
 func TestDetectRisksRequiresTwentyPercentDropAndBaselineSize(t *testing.T) {
 	forecast := Forecast{Confidence: ConfidenceMedium, Points: []ForecastPoint{
 		{Date: date("2026-07-01"), BaselineSessions: 200, PaidSessions: Range{P50: 150}, BaselineAmountRial: 10_000_000, PaidAmountRial: Range{P50: 7_000_000}},