fix(todo): improve drag-and-drop handles and fix reorder persistence

- Replace hamburger icon with standard 6-dot grip icon for drag handles
- Increase drag handle icon size (1rem → 1.25rem) and hit area
- Fix reorder bug: handleDndFinalize was not calling reorderTasks(),
  so reordered items were never persisted and would revert on refresh
- Add optimistic update with rollback on error in reorderTasks store

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

apps/todo/apps/web/src/lib/components/TaskItem.svelte

@@ -301,8 +301,13 @@
 	>
 		<!-- Drag handle -->
 		<div class="drag-handle">
-			<svg class="drag-icon" fill="none" viewBox="0 0 24 24" stroke="currentColor">
-				<path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M4 8h16M4 16h16" />
+			<svg class="drag-icon" viewBox="0 0 24 24" fill="currentColor">
+				<circle cx="9" cy="6" r="1.5" />
+				<circle cx="15" cy="6" r="1.5" />
+				<circle cx="9" cy="12" r="1.5" />
+				<circle cx="15" cy="12" r="1.5" />
+				<circle cx="9" cy="18" r="1.5" />
+				<circle cx="15" cy="18" r="1.5" />
 			</svg>
 		</div>
 
@@ -706,9 +711,11 @@
 		flex-shrink: 0;
 		display: flex;
 		align-items: center;
-		padding: 0.25rem;
-		margin-left: -0.125rem;
+		justify-content: center;
+		padding: 0.5rem 0.375rem;
+		margin-left: -0.25rem;
 		border-radius: 0.25rem;
+		min-height: 2rem;
 	}
 
 	.task-item:hover .drag-handle {
@@ -730,8 +737,8 @@
 	}
 
 	.drag-icon {
-		width: 1rem;
-		height: 1rem;
+		width: 1.25rem;
+		height: 1.25rem;
 		color: currentColor;
 	}
 

apps/todo/apps/web/src/lib/components/TaskList.svelte

@@ -197,6 +197,10 @@
 				// Task moved FROM another section TO this section
 				onTaskDrop(movedTaskId, dropTargetDate);
 			}
+		} else if (wasInThisList) {
+			// Task reordered within this list - persist the new order
+			const taskIds = newItems.map((t) => t.id);
+			tasksStore.reorderTasks(taskIds);
 		}
 
 		// Update local state and sync lastTaskKey to prevent $effect from reverting

apps/todo/apps/web/src/lib/stores/tasks.svelte.ts

@@ -452,17 +452,19 @@ export const tasksStore = {
 	 */
 	async reorderTasks(taskIds: string[]) {
 		error = null;
+		const previousTasks = [...tasks];
 		try {
-			await tasksApi.reorderTasks(taskIds);
-			// Update local order
+			// Optimistic update - set new order values
 			tasks = tasks.map((t) => {
 				const newOrder = taskIds.indexOf(t.id);
 				return newOrder !== -1 ? { ...t, order: newOrder } : t;
 			});
+			await tasksApi.reorderTasks(taskIds);
 		} catch (e) {
+			// Rollback on error
+			tasks = previousTasks;
 			error = e instanceof Error ? e.message : 'Failed to reorder tasks';
 			console.error('Failed to reorder tasks:', e);
-			throw e;
 		}
 	},