auto select top sub in dashboard

app/src/main/java/sh/sar/gridflow/ui/home/HomeFragment.kt

@@ -108,6 +108,15 @@ class HomeFragment : Fragment() {
         // Subscriptions
         homeViewModel.subscriptions.observe(viewLifecycleOwner) { subscriptions ->
             subscriptionsAdapter.updateSubscriptions(subscriptions)
+            
+            // Auto-select the first subscription if none is selected and subscriptions are available
+            if (subscriptions.isNotEmpty() && selectedSubscriptionId == null) {
+                val firstSubscription = subscriptions[0]
+                selectedSubscriptionId = firstSubscription.id
+                subscriptionsAdapter.setSelectedSubscription(firstSubscription.id)
+                homeViewModel.loadUsageChart(firstSubscription.id)
+                updateSelectedSubscriptionInfo(firstSubscription)
+            }
         }
         
         homeViewModel.isLoadingSubscriptions.observe(viewLifecycleOwner) { isLoading ->