feat: Enhance attendance chart visibility based on project selection

lib/view/dashboard/dashboard_screen.dart

@@ -59,9 +59,27 @@ class _DashboardScreenState extends State<DashboardScreen> with UIMixin {
             MySpacing.height(12),
             _buildDashboardStats(),
             MySpacing.height(24),
-            AttendanceDashboardChart(),
+            GetBuilder<ProjectController>(
+              id: 'dashboard_controller',
+              builder: (projectController) {
+                final bool isProjectSelected =
+                    projectController.selectedProject != null;
 
-            MySpacing.height(300),
+                return Opacity(
+                  opacity: isProjectSelected ? 1.0 : 0.4,
+                  child: IgnorePointer(
+                    ignoring: !isProjectSelected,
+                    child: Column(
+                      crossAxisAlignment: CrossAxisAlignment.start,
+                      children: [
+                        AttendanceDashboardChart(),
+                        MySpacing.height(300),
+                      ],
+                    ),
+                  ),
+                );
+              },
+            ),
             if (!hasMpin) ...[
               MyCard(
                 borderRadiusAll: 12,