Update TaskProgressCircle to visually indicate task completion

- Changed the stroke color of the progress circle to green when progress reaches 100%.
- Added a green checkmark icon for completed tasks, enhancing visual feedback.
- Retained progress percentage display for tasks that are not yet complete, ensuring clarity in task status.

worklenz-frontend/src/components/enhanced-kanban/EnhancedKanbanBoardNativeDnD/TaskProgressCircle.tsx

@@ -16,7 +16,7 @@ const TaskProgressCircle: React.FC<{ task: IProjectTask; size?: number }> = ({ t
                 cx={size / 2}
                 cy={size / 2}
                 r={radius}
-                stroke="#3b82f6"
+                stroke={progress === 100 ? "#22c55e" : "#3b82f6"}
                 strokeWidth={strokeWidth}
                 fill="none"
                 strokeDasharray={circumference}
@@ -24,7 +24,16 @@ const TaskProgressCircle: React.FC<{ task: IProjectTask; size?: number }> = ({ t
                 strokeLinecap="round"
                 style={{ transition: 'stroke-dashoffset 0.3s' }}
             />
-            {task.complete_ratio && <text
+            {progress === 100 ? (
+                // Green checkmark icon
+                <g>
+                    <circle cx={size / 2} cy={size / 2} r={radius} fill="#22c55e" opacity="0.15" />
+                    <svg x={(size/2)-(size*0.22)} y={(size/2)-(size*0.22)} width={size*0.44} height={size*0.44} viewBox="0 0 24 24">
+                        <path d="M5 13l4 4L19 7" stroke="#22c55e" strokeWidth="2.2" fill="none" strokeLinecap="round" strokeLinejoin="round"/>
+                    </svg>
+                </g>
+            ) : progress > 0 && (
+                <text
                     x="50%"
                     y="50%"
                     textAnchor="middle"
@@ -34,7 +43,8 @@ const TaskProgressCircle: React.FC<{ task: IProjectTask; size?: number }> = ({ t
                     fontWeight="bold"
                 >
                     {Math.round(progress)}
-            </text>}
+                </text>
+            )}
         </svg>
     );
 };