Fix widget overdue count to use kanban categorization

The widget was calculating overdue count from due dates, which didn't
account for in-progress tasks. Now uses the isOverdue flag from kanban
categorization, ensuring the count matches the displayed tasks.

Before: 3 overdue (date-based calc included in-progress tasks)
After: 2 overdue (matches kanban which excludes in-progress)

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

iosApp/Casera/MyCrib.swift

@@ -210,9 +210,10 @@ struct SimpleEntry: TimelineEntry {
         return TaskStatsCalculator.calculate(from: dueDates)
     }
 
-    /// Overdue tasks count
+    /// Overdue tasks count - uses the isOverdue flag from kanban categorization
+    /// which correctly excludes in-progress tasks
     var overdueCount: Int {
-        calculatedStats.overdueCount
+        upcomingTasks.filter { $0.isOverdue }.count
     }
 
     /// Tasks due within the next 7 days (exclusive of overdue)