refactor(ui): Rediseño completo de UI con Nuxt UI 4

- Nuevo layout responsivo mobile-first con tabs inferiores
- Sidebar colapsable en desktop con cola de impresión
- Sistema de templates reutilizables con localStorage
- Soporte Dark/Light mode con UColorModeButton
- Composables usePrintQueue y useTemplates para estado global
- Componentes modulares: CommandBuilder, QuickActions, PrintQueue, QueueItem
- Navegación por tabs: Constructor | Cola | Templates

server/api/print/cut.post.ts

@@ -0,0 +1,36 @@
+// Endpoint para cortar papel
+import { buildFromOperations } from '~/server/utils/eposBuilder'
+import { buildSoapEnvelope, sendToPrinter, parsePrinterResponse } from '~/server/utils/printer'
+
+export default defineEventHandler(async (event) => {
+  try {
+    const config = useRuntimeConfig()
+    const body = await readBody(event)
+
+    const { type = 'feed' } = body as { type?: string }
+
+    const inner = buildFromOperations([{ op: 'cut', type }])
+    const soap = buildSoapEnvelope(inner)
+
+    const result = await sendToPrinter(
+      soap,
+      config.printerHost,
+      config.printerDeviceId,
+      parseInt(config.printerTimeoutMs)
+    )
+
+    const { success, code } = parsePrinterResponse(result.data)
+
+    return {
+      ok: success,
+      httpStatus: result.status,
+      code,
+      raw: result.data
+    }
+  } catch (err: any) {
+    return {
+      ok: false,
+      error: err.message
+    }
+  }
+})