feat(08-02): add smartDeleteTask to TaskActions provider

- Checks completion count before deleting
- Hard-deletes tasks with 0 completions
- Soft-deletes (isActive=false) tasks with completions
- Keeps existing deleteTask method for cascade/other uses

lib/features/tasks/presentation/task_providers.g.dart

@@ -36,7 +36,7 @@ final class TaskActionsProvider
   TaskActions create() => TaskActions();
 }
 
-String _$taskActionsHash() => r'62f1739263e3cfb379b83de10d712b17fd087f92';
+String _$taskActionsHash() => r'4ef782496ca32338f12281bab258a63a59a293e5';
 
 /// Notifier for task mutations: create, update, delete, complete.