Add checklist templates with import into devices

- checklist_templates and template_items tables for reusable checklists
- /checklists page: create/edit/delete templates with ordered items
- "Import" button on device detail imports a template as a new checklist
  with all items copied (unchecked)
- Sidebar nav item for Checklists between Locations and Gallery

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

src/lib/components/layout/Sidebar.svelte

@@ -37,6 +37,11 @@
 			label: 'Locations',
 			icon: 'M17.657 16.657L13.414 20.9a1.998 1.998 0 01-2.827 0l-4.244-4.243a8 8 0 1111.314 0z M15 11a3 3 0 11-6 0 3 3 0 016 0z'
 		},
+		{
+			href: '/checklists',
+			label: 'Checklists',
+			icon: 'M9 5H7a2 2 0 00-2 2v12a2 2 0 002 2h10a2 2 0 002-2V7a2 2 0 00-2-2h-2M9 5a2 2 0 002 2h2a2 2 0 002-2M9 5a2 2 0 012-2h2a2 2 0 012 2m-6 9l2 2 4-4'
+		},
 		{
 			href: '/gallery',
 			label: 'Gallery',

src/lib/server/db/schema.ts

@@ -195,6 +195,29 @@ export const installationLog = pgTable(
 	]
 );
 
+// ─── Checklist Templates ────────────────────────────────────────────
+
+export const checklistTemplates = pgTable('checklist_templates', {
+	id: uuid('id').defaultRandom().primaryKey(),
+	title: text('title').notNull(),
+	description: text('description'),
+	createdAt: timestamp('created_at', { withTimezone: true }).defaultNow().notNull(),
+	updatedAt: timestamp('updated_at', { withTimezone: true }).defaultNow().notNull()
+});
+
+export const templateItems = pgTable(
+	'template_items',
+	{
+		id: uuid('id').defaultRandom().primaryKey(),
+		templateId: uuid('template_id')
+			.notNull()
+			.references(() => checklistTemplates.id, { onDelete: 'cascade' }),
+		text: text('text').notNull(),
+		sortOrder: integer('sort_order').default(0).notNull()
+	},
+	(table) => [index('template_items_template_idx').on(table.templateId)]
+);
+
 // ─── Device Checklists ──────────────────────────────────────────────
 
 export const deviceChecklists = pgTable(