Updated: Improved vehicle and refuel data handling on dashboard

Updated:
- DashboardController now fetches latest refuel record only for the default vehicle
- VehicleController - first created vehicle is now set as default automatically
- Refuel model - latest_one() now accepts vehicle_id instead of user_id
- Dashboard view - improved handling when no vehicles or refuel records exist
- CSS styles - adjusted dashboard layout and global action padding

public/css/dashboard.css

@@ -9,7 +9,6 @@
   flex-wrap: wrap;
   gap: 1rem;
   justify-content: center;
-  margin-top: 2rem;
 }
 
 .card {

public/css/global.css

@@ -52,3 +52,8 @@ h1 {
 	background-color: var(--clr-warning-muted);
 	border: var(--borderWidth-thin) solid var(--clr-border-danger);
 }
+
+#actions {
+	padding-top: 1rem;
+	padding-bottom: 2rem;
+}