fix: Task date/time update not saving

- Added due parameter to updateTask in useTasks hook
- Fixed handleTaskUpdate in TaskListCard to pass due date
- Service already handled due date correctly

Now editing a task's date/time persists properly

Author: codad5

src/components/tasks/TaskListCard.tsx

@@ -188,8 +188,7 @@ export default function TaskListCard({
   };
 
   const handleTaskUpdate = async (task: AppTask, title: string, notes?: string, due?: Date) => {
-    await updateTask(taskList.id, task.id, title, notes);
-    // Note: due date handling would need updateTask to be extended
+    await updateTask(taskList.id, task.id, title, notes, due);
   };
 
   const handleAddSubtask = async (task: AppTask, title: string) => {

src/hooks/useTasks.ts

@@ -343,13 +343,14 @@ export function useTasks() {
   }, [service, taskLists, updateTaskInState, setToast]);
 
   /**
-   * Update a task's title and/or notes
+   * Update a task's title, notes, and/or due date
    */
   const updateTask = useCallback(async (
     listId: string, 
     taskId: string, 
     title: string, 
-    notes?: string
+    notes?: string,
+    due?: Date
   ): Promise<boolean> => {
     if (!service) return false;
 
@@ -358,10 +359,11 @@ export function useTasks() {
       ...task, 
       title,
       notes: notes ?? task.notes,
+      due: due ? due.toISOString() : task.due,
     }));
 
     try {
-      await service.updateTask({ listId, id: taskId, title, notes });
+      await service.updateTask({ listId, id: taskId, title, notes, due });
       return true;
     } catch (err) {
       // Revert would need original values - for simplicity, just show error