Fix date format in StatsDashboardPage for weekly report type from "GGGG-[W]WW" to "gggg-[W]ww" to ensure consistency in date representation.

src/app/(dashboard)/statistics/dashboard/page.tsx

@@ -725,7 +725,7 @@ const StatsDashboardPage: React.FC = () => {
               reportType === 0
                 ? "YYYY-MM-DD"
                 : reportType === 1
-                  ? "GGGG-[W]WW"
+                  ? "gggg-[W]ww"
                   : "YYYY-MM"
             }
           />