fix: resolve 4 bugs in devtrack

Author: Saurabh Kumar Bajpai

src/app/api/metrics/contributions/route.ts

@@ -383,7 +383,7 @@ export async function GET(req: NextRequest) {
   } else {
     const daysParam = req.nextUrl.searchParams.get("days");
     const parsedDays = daysParam ? parseInt(daysParam, 10) : NaN;
-    days = isNaN(parsedDays) ? 30 : Math.max(1, Math.min(365, parsedDays));
+    days = Number.isNaN(parsedDays) ? 30 : Math.max(1, Math.min(365, parsedDays));
   }
 
   const accountId = req.nextUrl.searchParams.get("accountId");

src/app/api/metrics/prs/route.ts

@@ -158,7 +158,7 @@ async function getAverageFirstReviewHours(
   if (validDurations.length === 0) return null;
 
   const average = validDurations.reduce((sum, value) => sum + value, 0) / validDurations.length;
-  return Math.round(average * 10) / 10;
+  return Math.round(average * 10 + Number.EPSILON) / 10;
 }
 
 async function fetchPRMetrics(