Add device checklists and retro Mac favicon

Checklists feature:
- device_checklists and checklist_items tables
- Create multiple named checklists per device
- Add/toggle/delete items with progress bar
- Checkbox UI with green check, strikethrough for completed items
- Delete checklist button with item count display

Also adds the classic Mac happy face as favicon.

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

src/lib/server/db/schema.ts

@@ -195,6 +195,36 @@ export const installationLog = pgTable(
 	]
 );
 
+// ─── Device Checklists ──────────────────────────────────────────────
+
+export const deviceChecklists = pgTable(
+	'device_checklists',
+	{
+		id: uuid('id').defaultRandom().primaryKey(),
+		deviceId: uuid('device_id')
+			.notNull()
+			.references(() => devices.id, { onDelete: 'cascade' }),
+		title: text('title').notNull(),
+		createdAt: timestamp('created_at', { withTimezone: true }).defaultNow().notNull()
+	},
+	(table) => [index('device_checklists_device_idx').on(table.deviceId)]
+);
+
+export const checklistItems = pgTable(
+	'checklist_items',
+	{
+		id: uuid('id').defaultRandom().primaryKey(),
+		checklistId: uuid('checklist_id')
+			.notNull()
+			.references(() => deviceChecklists.id, { onDelete: 'cascade' }),
+		text: text('text').notNull(),
+		checked: boolean('checked').default(false).notNull(),
+		sortOrder: integer('sort_order').default(0).notNull(),
+		createdAt: timestamp('created_at', { withTimezone: true }).defaultNow().notNull()
+	},
+	(table) => [index('checklist_items_checklist_idx').on(table.checklistId)]
+);
+
 // ─── Device Log (append-only repair/operation history) ───────────────
 
 export const deviceLog = pgTable(