fix: resolve 4 bugs in devtrack

src/app/api/local-coding/sync/route.ts

@@ -279,7 +279,7 @@ export async function GET(req: NextRequest) {
 
   const { searchParams } = new URL(req.url);
   const rawDays = parseInt(searchParams.get("days") || "30", 10);
-  const days = validateDays(isNaN(rawDays) ? DEFAULT_DAYS : rawDays);
+  const days = validateDays(Number.isNaN(rawDays) ? DEFAULT_DAYS : rawDays);
   const fromDate = new Date();
   fromDate.setDate(fromDate.getDate() - days);
   const fromDateStr = fromDate.toISOString().slice(0, 10);

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

@@ -65,7 +65,7 @@
       if (!searchRes.ok) throw new Error("API Error");
 
       const raw = await searchRes.json();
-      const repoNames = Array.from(new Set<string>(raw.items.map((i: any) => i.repository.full_name)));
+      const repoNames = Array.from(new Set<string>(raw.(items ?? []).map((i: any) => i.repository.full_name)));
       const topRepoNames = repoNames.slice(0, 20);
       const langTotals: Record<string, number> = {};
       const failedRepos: Array<{ name: string; statusCode?: number; error: string }> = [];

src/app/dashboard/repo-comparison/page.tsx

@@ -203,4 +203,5 @@
       )}
     </div>
   );
-}
+}
+.catch(err => console.error("Promise.all failed:", err));