fix: prevent empty doughnut chart from rendering as black circle

When all task counts are zero, the Chart.js doughnut renders as a solid
black/dark circle. Added a check to show a gray placeholder segment
with "No tasks yet" label instead.

app/Filament/Widgets/OrchestratorOutcomesChart.php

@@ -55,6 +55,22 @@ class OrchestratorOutcomesChart extends ChartWidget
             ->pending()
             ->count();
 
+        // If all values are zero, show a placeholder to prevent empty doughnut rendering
+        $total = $completed + $dismissed + $snoozed + $pending;
+        if ($total === 0) {
+            return [
+                'datasets' => [
+                    [
+                        'label' => 'No Data',
+                        'data' => [1],
+                        'backgroundColor' => ['rgba(209, 213, 219, 0.5)'], // gray placeholder
+                        'borderWidth' => 0,
+                    ],
+                ],
+                'labels' => ['No tasks yet'],
+            ];
+        }
+
         return [
             'datasets' => [
                 [