fix: logic to show BSR improvements (rank drops) in green

test_did.ts

@@ -0,0 +1,40 @@
+import { computeDiD } from './services/experimentAnalysis';
+import { CombinedKPIs, Experiment } from './types';
+
+const salesData: CombinedKPIs[] = [
+    {
+        id: '1', marketplace: 'Amazon DE', customer: 'Amazon DE', month: 'Jan-24', week: 1, year: 2024,
+        asin: 'B0C123', title: 'Test', line: 'Test', sku: 'T-1',
+        salesTotal: 1000, unitsTotal: 100, salesAds: 500, unitsAds: 50, cost: 100,
+        clicks: 100, impressions: 1000, conversions: 5, salesOrganic: 500, unitsOrganic: 50,
+        paidSalesShare: 50, organicSalesShare: 50, acos: 20, tacos: 10, roas: 5, ctr: 10, cpc: 1, cvrUnits: 5, glanceViews: 1000
+    },
+    {
+        id: '2', marketplace: 'Amazon DE', customer: 'Amazon DE', month: 'Feb-24', week: 5, year: 2024,
+        asin: 'B0C123', title: 'Test', line: 'Test', sku: 'T-1',
+        salesTotal: 2000, unitsTotal: 200, salesAds: 2000, unitsAds: 200, cost: 200,
+        clicks: 200, impressions: 2000, conversions: 10, salesOrganic: 0, unitsOrganic: 0,
+        paidSalesShare: 100, organicSalesShare: 0, acos: 10, tacos: 10, roas: 10, ctr: 10, cpc: 1, cvrUnits: 5, glanceViews: 2000
+    }
+];
+
+const experiment: Experiment = {
+    id: 'exp1',
+    name: 'Test Exp',
+    type: 'advertising',
+    status: 'active',
+    asins: ['B0C123'],
+    control_asins: [],
+    marketplace: 'DE',
+    start_date: '2024-01-20',
+    end_date: '2024-02-28',
+    baseline_start_date: '2023-12-01',
+    baseline_end_date: '2024-01-19',
+    created_at: '',
+    updated_at: '',
+    primary_metric: 'acos',
+    changes: []
+};
+
+const result = computeDiD(experiment, salesData);
+console.log(JSON.stringify(result.metrics, null, 2));