Fix checklist item add: form value cleared before submission

The bind:value + onsubmit pattern caused the input to be empty when
enhance submitted the form. Replaced with post-submission DOM reset
so the value is intact during submission.

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

src/routes/(app)/devices/[id]/+page.svelte

@@ -11,7 +11,10 @@
 	let showLogForm = $state(false);
 	let showNewChecklist = $state(false);
 	let showImportChecklist = $state(false);
-	let newItemText: Record<string, string> = $state({});
+	function resetInput(formEl: HTMLFormElement) {
+		const input = formEl.querySelector('input[name="text"]') as HTMLInputElement;
+		if (input) input.value = '';
+	}
 </script>
 
 <svelte:head>
@@ -436,11 +439,19 @@
 								</div>
 
 								<!-- Add item -->
-								<form method="POST" action="?/addChecklistItem" use:enhance
-									onsubmit={() => { newItemText[checklist.id] = ''; }}
+								<form method="POST" action="?/addChecklistItem" use:enhance={() => {
+										return async ({ update, result }) => {
+											await update();
+											if (result.type === 'success') {
+												const form = document.querySelector(`form[data-checklist="${checklist.id}"]`) as HTMLFormElement;
+												if (form) resetInput(form);
+											}
+										};
+									}}
+									data-checklist={checklist.id}
 									class="mt-2 flex gap-2">
 									<input type="hidden" name="checklistId" value={checklist.id} />
-									<input type="text" name="text" required bind:value={newItemText[checklist.id]}
+									<input type="text" name="text" required
 										placeholder="Add item..."
 										class="flex-1 rounded-md border border-gray-200 px-2 py-1 text-sm focus:border-blue-500 focus:ring-1 focus:ring-blue-500 focus:outline-none dark:border-gray-600 dark:bg-gray-700 dark:text-white dark:placeholder-gray-400" />
 									<button type="submit" class="rounded-md px-2 py-1 text-sm text-blue-600 hover:bg-blue-50 dark:text-blue-400 dark:hover:bg-blue-900/20">