fix(todo): prevent DnD from blocking subtask clicks in KanbanTaskCard

svelte-dnd-action intercepted pointerdown on .task-card-wrapper items,
which interfered with clicks on the inline subtask buttons. Stopping
pointer event propagation on the subtasks container prevents DnD from
treating subtask clicks as drag interactions.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

apps/todo/apps/web/src/lib/components/kanban/KanbanTaskCard.svelte

@@ -270,7 +270,8 @@
 
 <!-- Inline subtasks -->
 {#if task.subtasks && task.subtasks.length > 0 && !task.isCompleted}
-	<div class="subtasks-inline">
+	<!-- svelte-ignore a11y_no_static_element_interactions -->
+	<div class="subtasks-inline" onpointerdown={(e) => e.stopPropagation()}>
 		{#each task.subtasks as subtask (subtask.id)}
 			<button
 				class="subtask-row"