Fix iOS widget showing completed tasks

Exclude completed_tasks and cancelled_tasks columns when saving
tasks to the widget cache. Also use kanban column name to determine
overdue status instead of recalculating it.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

iosApp/iosApp/Helpers/WidgetDataManager.swift

@@ -50,10 +50,18 @@ final class WidgetDataManager {
             return
         }
 
-        // Extract tasks from all columns and convert to WidgetTask
+        // Columns to exclude from widget (these are "done" states)
+        let excludedColumns = ["completed_tasks", "cancelled_tasks"]
+
+        // Extract tasks from active columns only and convert to WidgetTask
         var allTasks: [WidgetTask] = []
 
         for column in response.columns {
+            // Skip completed and cancelled columns
+            if excludedColumns.contains(column.name) {
+                continue
+            }
+
             for task in column.tasks {
                 let widgetTask = WidgetTask(
                     id: Int(task.id),
@@ -64,7 +72,7 @@ final class WidgetDataManager {
                     dueDate: task.dueDate,
                     category: task.category?.name ?? "",
                     residenceName: "", // No longer available in API, residence lookup needed
-                    isOverdue: isTaskOverdue(dueDate: task.dueDate, status: task.status?.name)
+                    isOverdue: column.name == "overdue_tasks"
                 )
                 allTasks.append(widgetTask)
             }