Add next_due_date to admin task views

Display next_due_date field in task list table and task detail page
so admins can see the effective date used for overdue calculations.

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

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

admin/src/app/(dashboard)/tasks/[id]/client.tsx

@@ -124,6 +124,14 @@ export function TaskDetailClient() {
                 <div className="text-sm font-medium text-muted-foreground">Due Date</div>
                 <div>{task.due_date ? new Date(task.due_date).toLocaleDateString() : '-'}</div>
               </div>
+              <div>
+                <div className="text-sm font-medium text-muted-foreground">Next Due Date</div>
+                <div>{task.next_due_date ? new Date(task.next_due_date).toLocaleDateString() : '-'}</div>
+              </div>
+              <div>
+                <div className="text-sm font-medium text-muted-foreground">Frequency</div>
+                <div>{task.frequency_name || '-'}</div>
+              </div>
             </div>
           </CardContent>
         </Card>

admin/src/app/(dashboard)/tasks/page.tsx

@@ -67,6 +67,11 @@ const columns: ColumnDef<Task>[] = [
     header: 'Due Date',
     cell: ({ row }) => row.original.due_date ? new Date(row.original.due_date).toLocaleDateString() : '-',
   },
+  {
+    accessorKey: 'next_due_date',
+    header: 'Next Due',
+    cell: ({ row }) => row.original.next_due_date ? new Date(row.original.next_due_date).toLocaleDateString() : '-',
+  },
   {
     accessorKey: 'is_cancelled',
     header: 'State',

admin/src/types/models.ts

@@ -191,6 +191,7 @@ export interface Task {
   frequency_id?: number;
   frequency_name?: string;
   due_date?: string;
+  next_due_date?: string;
   estimated_cost?: number;
   actual_cost?: number;
   contractor_id?: number;