M3 Overhaul

lib/screens/reports/widgets/report_card_wrapper.dart

@@ -91,7 +91,10 @@ class ReportCardWrapper extends StatelessWidget {
     );
 
     final card = Card(
-      // Rely on CardTheme for elevation (M2 exception in hybrid system).
+      elevation: 0,
+      shadowColor: Colors.transparent,
+      color: colors.surfaceContainerLow,
+      shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(16)),
       child: cardContent,
     );