feat: hide completed tasks from previous days

Added 'updateTaskDisplay' method to hide tasks marked as done if their due date is before the current day. This helps declutter the task view by filtering out outdated completed tasks. The 'updateTaskDisplay' method is invoked during initialization and when tasks are loaded.

kanblendar.js

@@ -60,6 +60,7 @@ class Kanblendar {
         this.initDragAndDrop(); // Initialize drag and drop functionality
         this.requestNotificationPermission(); // Request permission for notifications
         this.highlightCurrentTimeSlot(); // Highlight the current time slot
+        this.updateTaskDisplay(); // Hide tasks completed before today
         setInterval(() => this.highlightCurrentTimeSlot(), 60000); // Update highlight every minute
     }
 
@@ -527,6 +528,7 @@ class Kanblendar {
                 this.moveTaskToNonTimedSection(taskElement, column);
             }
         });
+        this.updateTaskDisplay();
         this.adjustTimeSlotHeights();
     }
 
@@ -539,4 +541,25 @@ class Kanblendar {
         });
         document.dispatchEvent(event);
     }
+
+    updateTaskDisplay() {
+        const now = new Date();
+        now.setHours(0, 0, 0, 0);
+
+        // Iterate over each task and check its column and due date
+        this.tasks.forEach((task, taskId) => {
+            const taskElement = document.getElementById(taskId);
+
+            // Parse the task's due time
+            const taskDueDate = task.dueTime ? new Date(task.dueTime) : null;
+
+            if (task.column === 'done' && taskDueDate && taskDueDate < now) {
+                // Hide tasks that are done and before today's date
+                taskElement.style.display = 'none';
+            } else {
+                // Show all other tasks
+                taskElement.style.display = 'block';
+            }
+        });
+    }
 }