fix(FN-2498): keep New Task more options collapsed by default

- Add an autoExpandMoreOptionsOnSelection prop to TaskForm and gate advanced-section auto-expansion behind it
- Disable auto-expansion in NewTaskModal so default-on workflow step preselection does not open More options on first render
- Mark collapsed advanced content with the hidden attribute to prevent interaction until expanded
- Add dashboard tests for default collapsed state, opt-out auto-expand behavior, and default-on workflow-step regression coverage
- Replace hardcoded spacing/transition values in NewTaskModal.css with design tokens

packages/dashboard/app/components/NewTaskModal.tsx

@@ -455,6 +455,7 @@ export function NewTaskModal({ isOpen, onClose, projectId, tasks, onCreateTask,
             onPriorityChange={setPriority}
             renderBelowPrimary={quickFields}
             hideDependencies={true}
+            autoExpandMoreOptionsOnSelection={false}
           />
 
         </div>