fix: use deterministic benchmark contribution data

Author: zairahussain27

scripts/benchmark-svg.ts

@@ -18,11 +18,21 @@ const baseParams = {
   speed: sanitizeSpeed('8s'),
 };
 
+const deterministicContributionCount = (
+  weekIndex: number,
+  dayIndex: number
+): number => {
+  return ((weekIndex * 7 + dayIndex) * 13) % 20;
+};
+
 const calendar = {
   totalContributions: 1240,
   weeks: Array.from({ length: 14 }, (_, weekIndex) => ({
     contributionDays: Array.from({ length: 7 }, (_, dayIndex) => ({
-      contributionCount: Math.floor(Math.random() * 20),
+      contributionCount: deterministicContributionCount(
+        weekIndex,
+        dayIndex
+      ),
       date: `2026-05-${String(weekIndex * 7 + dayIndex + 1).padStart(2, '0')}`,
     })),
   })),