feat: Implement persistence and initial project setup

ap-pos/.gitignore

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+# Dependencies
+/node_modules
+
+# Local Database
+ap-pos.db
+
+# Environment variables
+.env
+*.env.local
+*.env.*.local
+
+# Log files
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*

ap-pos/LICENSE

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+MIT License
+
+Copyright (c) 2025 marcogll
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

ap-pos/app.js

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+import { load, save, remove, KEY_DATA, KEY_SETTINGS, KEY_CLIENTS } from './storage.js';
+import { renderTicketAndPrint } from './print.js';
+
+// --- ESTADO Y DATOS ---
+const DEFAULT_SETTINGS = {
+  negocio: 'Ale Ponce',
+  tagline: 'beauty expert',
+  calle: 'Benito Juarez 246',
+  colonia: 'Col. Los Pinos',
+  cp: '252 pinos',
+  rfc: '',
+  tel: '8443555108',
+  leyenda: '¡Gracias por tu preferencia!',
+  folioPrefix: 'AP-',
+  folioSeq: 1
+};
+
+let settings = {};
+let movements = [];
+let clients = [];
+
+// --- DOM ELEMENTS ---
+const formSettings = document.getElementById('formSettings');
+const formMove = document.getElementById('formMove');
+const tblMovesBody = document.getElementById('tblMoves')?.querySelector('tbody');
+const btnExport = document.getElementById('btnExport');
+const btnTestTicket = document.getElementById('btnTestTicket');
+const formClient = document.getElementById('formClient');
+const tblClientsBody = document.getElementById('tblClients')?.querySelector('tbody');
+const clientDatalist = document.getElementById('client-list');
+
+// --- LÓGICA DE NEGOCIO ---
+
+async function getNextFolio() {
+  const folio = `${settings.folioPrefix || ''}${String(settings.folioSeq).padStart(6, '0')}`;
+  settings.folioSeq += 1;
+  await save(KEY_SETTINGS, settings);
+  return folio;
+}
+
+async function addMovement(mov) {
+  await save('movements', { movement: mov });
+  movements.unshift(mov);
+  renderTable();
+}
+
+async function deleteMovement(id) {
+  if (confirm('¿Estás seguro de que quieres eliminar este movimiento?')) {
+    await remove(KEY_DATA, id);
+    movements = movements.filter(m => m.id !== id);
+    renderTable();
+  }
+}
+
+async function saveClient(clientData) {
+  let clientToSave;
+  let isUpdate = false;
+
+  if (clientData) {
+    // Data is passed directly (e.g., from new movement creation)
+    clientToSave = clientData;
+  } else {
+    // Read from the client form
+    isUpdate = !!document.getElementById('c-id').value;
+    const id = isUpdate ? document.getElementById('c-id').value : crypto.randomUUID();
+    clientToSave = {
+      id: id,
+      nombre: document.getElementById('c-nombre').value,
+      telefono: document.getElementById('c-telefono').value,
+      cumpleaños: document.getElementById('c-cumple').value,
+      consentimiento: document.getElementById('c-consent').checked,
+    };
+  }
+
+  await save('clients', { client: clientToSave });
+
+  if (isUpdate) {
+    const index = clients.findIndex(c => c.id === clientToSave.id);
+    if (index > -1) {
+      clients[index] = clientToSave;
+    }
+  } else {
+    // Avoid duplicates if client was already added optimistically
+    if (!clients.some(c => c.id === clientToSave.id)) {
+        clients.push(clientToSave);
+    }
+  }
+  
+  renderClientsTable();
+  updateClientDatalist();
+
+  // Only reset the form if we were using it
+  if (!clientData) {
+    document.getElementById('formClient').reset();
+    document.getElementById('c-id').value = '';
+  }
+}
+
+async function deleteClient(id) {
+  if (confirm('¿Estás seguro de que quieres eliminar este cliente? Se conservarán sus recibos históricos.')) {
+    await remove(KEY_CLIENTS, id);
+    clients = clients.filter(c => c.id !== id);
+    renderClientsTable();
+    updateClientDatalist();
+  }
+}
+
+function exportCSV() {
+  const headers = 'folio,fechaISO,cliente,tipo,monto,metodo,concepto,staff,notas';
+  const rows = movements.map(m => {
+    const client = clients.find(c => c.id === m.clienteId);
+    return [
+      m.folio, m.fechaISO, client ? client.nombre : 'N/A', m.tipo, m.monto,
+      m.metodo || '', m.concepto || '', m.staff || '', m.notas || ''
+    ].map(val => `"${String(val).replace(/"/g, '""')}"`).join(',');
+  });
+  
+  const csvContent = `data:text/csv;charset=utf-8,${headers}\n${rows.join('\n')}`;
+  const encodedUri = encodeURI(csvContent);
+  const link = document.createElement('a');
+  link.setAttribute('href', encodedUri);
+  link.setAttribute('download', 'movimientos.csv');
+  document.body.appendChild(link);
+  link.click();
+  document.body.removeChild(link);
+}
+
+// --- RENDERIZADO ---
+
+function renderSettings() {
+  document.getElementById('s-negocio').value = settings.negocio || '';
+  document.getElementById('s-tagline').value = settings.tagline || '';
+  document.getElementById('s-calle').value = settings.calle || '';
+  document.getElementById('s-colonia-cp').value = settings.colonia && settings.cp ? `${settings.colonia}, ${settings.cp}` : '';
+  document.getElementById('s-rfc').value = settings.rfc || '';
+  document.getElementById('s-tel').value = settings.tel || '';
+  document.getElementById('s-leyenda').value = settings.leyenda || '';
+  document.getElementById('s-folioPrefix').value = settings.folioPrefix || '';
+}
+
+function renderTable() {
+  if (!tblMovesBody) return;
+  tblMovesBody.innerHTML = '';
+  movements.forEach(mov => {
+    const client = clients.find(c => c.id === mov.clienteId);
+    const tr = document.createElement('tr');
+    tr.innerHTML = `
+      <td><a href="#" class="action-btn" data-id="${mov.id}" data-action="reprint">${mov.folio}</a></td>
+      <td>${new Date(mov.fechaISO).toLocaleDateString('es-MX')}</td>
+      <td>${client ? client.nombre : 'Cliente Eliminado'}</td>
+      <td>${mov.tipo}</td>
+      <td>${Number(mov.monto).toFixed(2)}</td>
+      <td><button class="action-btn" data-id="${mov.id}" data-action="delete">Eliminar</button></td>
+    `;
+    tblMovesBody.appendChild(tr);
+  });
+}
+
+function renderClientsTable() {
+  if (!tblClientsBody) return;
+  tblClientsBody.innerHTML = '';
+  clients.forEach(c => {
+    const tr = document.createElement('tr');
+    tr.innerHTML = `
+      <td>${c.nombre}</td>
+      <td>${c.telefono || ''}</td>
+      <td>${c.cumpleaños ? new Date(c.cumpleaños).toLocaleDateString('es-MX') : ''}</td>
+      <td>${c.consentimiento ? 'Sí' : 'No'}</td>
+      <td>
+        <button class="action-btn" data-id="${c.id}" data-action="edit-client">Editar</button>
+        <button class="action-btn" data-id="${c.id}" data-action="delete-client">Eliminar</button>
+      </td>
+    `;
+    tblClientsBody.appendChild(tr);
+  });
+}
+
+function updateClientDatalist() {
+  if (!clientDatalist) return;
+  clientDatalist.innerHTML = '';
+  clients.forEach(c => {
+    const option = document.createElement('option');
+    option.value = c.nombre;
+    clientDatalist.appendChild(option);
+  });
+}
+
+// --- MANEJADORES DE EVENTOS ---
+
+async function handleSaveSettings(e) {
+  e.preventDefault();
+  settings.negocio = document.getElementById('s-negocio').value;
+  settings.tagline = document.getElementById('s-tagline').value;
+  settings.calle = document.getElementById('s-calle').value;
+  
+  const coloniaCp = document.getElementById('s-colonia-cp').value.split(',');
+  settings.colonia = coloniaCp[0]?.trim() || '';
+  settings.cp = coloniaCp[1]?.trim() || '';
+
+  settings.rfc = document.getElementById('s-rfc').value;
+  settings.tel = document.getElementById('s-tel').value;
+  settings.leyenda = document.getElementById('s-leyenda').value;
+  settings.folioPrefix = document.getElementById('s-folioPrefix').value;
+  await save(KEY_SETTINGS, { settings });
+  alert('Configuración guardada.');
+}
+
+async function handleNewMovement(e) {
+  e.preventDefault();
+  const form = e.target;
+  const monto = parseFloat(document.getElementById('m-monto').value || 0);
+  const clienteNombre = document.getElementById('m-cliente').value;
+
+  let client = clients.find(c => c.nombre.toLowerCase() === clienteNombre.toLowerCase());
+  if (!client) {
+    if (confirm(`El cliente "${clienteNombre}" no existe. ¿Deseas crearlo?`)) {
+      const newClient = {
+        id: crypto.randomUUID(),
+        nombre: clienteNombre,
+        telefono: '',
+        cumpleaños: '',
+        consentimiento: false
+      };
+      await saveClient(newClient); // This now works correctly
+      client = newClient;
+    } else {
+      return; // Do not create movement if client is not created
+    }
+  }
+
+  const newMovement = {
+    id: crypto.randomUUID(),
+    folio: await getNextFolio(),
+    fechaISO: new Date().toISOString(),
+    clienteId: client.id,
+    tipo: document.getElementById('m-tipo').value,
+    monto: Number(monto.toFixed(2)),
+    metodo: document.getElementById('m-metodo').value,
+    concepto: document.getElementById('m-concepto').value,
+    staff: document.getElementById('m-staff').value,
+    notas: document.getElementById('m-notas').value,
+  };
+
+  await addMovement(newMovement);
+  const movementForTicket = { ...newMovement, cliente: client.nombre };
+  renderTicketAndPrint(movementForTicket, settings);
+  form.reset();
+  document.getElementById('m-cliente').focus(); // Poner el foco en el campo de cliente
+}
+
+function handleTableClick(e) {
+  if (e.target.classList.contains('action-btn')) {
+    e.preventDefault();
+    const id = e.target.dataset.id;
+    const action = e.target.dataset.action;
+    
+    if (action === 'reprint' || action === 'delete') {
+      const movement = movements.find(m => m.id === id);
+      if (movement) {
+        if (action === 'reprint') {
+          const client = clients.find(c => c.id === movement.clienteId);
+          const movementForTicket = { ...movement, cliente: client ? client.nombre : 'N/A' };
+          renderTicketAndPrint(movementForTicket, settings);
+        } else if (action === 'delete') {
+          deleteMovement(id);
+        }
+      }
+    } else if (action === 'edit-client' || action === 'delete-client') {
+      const client = clients.find(c => c.id === id);
+      if (client) {
+        if (action === 'edit-client') {
+          document.getElementById('c-id').value = client.id;
+          document.getElementById('c-nombre').value = client.nombre;
+          document.getElementById('c-telefono').value = client.telefono;
+          document.getElementById('c-cumple').value = client.cumpleaños;
+          document.getElementById('c-consent').checked = client.consentimiento;
+        } else if (action === 'delete-client') {
+          deleteClient(id);
+        }
+      }
+    }
+  }
+}
+
+async function handleClientForm(e) {
+  e.preventDefault();
+  await saveClient();
+}
+
+function handleTabChange(e) {
+  const tabButton = e.target.closest('.tab-link');
+  if (!tabButton) return; // Si el clic no fue en un botón de pestaña, no hacer nada.
+
+  e.preventDefault();
+
+  // Quitar la clase 'active' de todas las pestañas y contenidos.
+  document.querySelectorAll('.tab-link').forEach(tab => tab.classList.remove('active'));
+  document.querySelectorAll('.tab-content').forEach(content => content.classList.remove('active'));
+
+  // Activar la pestaña correcta y su contenido.
+  const tabId = tabButton.dataset.tab;
+  tabButton.classList.add('active');
+  document.getElementById(tabId)?.classList.add('active');
+}
+
+function handleTestTicket() {
+    const demoMovement = {
+        id: 'demo',
+        folio: 'DEMO-000001',
+        fechaISO: new Date().toISOString(),
+        cliente: 'Cliente de Prueba',
+        tipo: 'Pago',
+        monto: 123.45,
+        metodo: 'Efectivo',
+        concepto: 'Producto de demostración',
+        staff: 'Admin',
+        notas: 'Esta es una impresión de prueba.'
+    };
+    renderTicketAndPrint(demoMovement, settings);
+}
+
+// --- INICIALIZACIÓN ---
+
+function initializeApp() {
+  const tabs = document.querySelector('.tabs');
+  
+  // Conectar eventos
+  formSettings?.addEventListener('submit', handleSaveSettings);
+  formMove?.addEventListener('submit', handleNewMovement);
+  tblMovesBody?.addEventListener('click', handleTableClick);
+  tblClientsBody?.addEventListener('click', handleTableClick);
+  btnExport?.addEventListener('click', exportCSV);
+  btnTestTicket?.addEventListener('click', handleTestTicket);
+  formClient?.addEventListener('submit', handleClientForm);
+  tabs?.addEventListener('click', handleTabChange);
+  document.getElementById('btnCancelEditClient')?.addEventListener('click', () => {
+    formClient.reset();
+    document.getElementById('c-id').value = '';
+  });
+
+  // Cargar datos y renderizar
+  Promise.all([
+    load(KEY_SETTINGS, DEFAULT_SETTINGS),
+    load(KEY_DATA, []),
+    load(KEY_CLIENTS, [])
+  ]).then(values => {
+    [settings, movements, clients] = values;
+    renderSettings();
+    renderTable();
+    renderClientsTable();
+    updateClientDatalist();
+  }).catch(error => {
+    console.error('CRITICAL: Failed to load initial data. The app may not function correctly.', error);
+    alert('Error Crítico: No se pudieron cargar los datos del servidor. Asegúrate de que el servidor (npm start) esté corriendo y que no haya errores en la terminal del servidor.');
+  });
+}
+
+// Esperar a que el DOM esté completamente cargado para iniciar la app
+document.addEventListener('DOMContentLoaded', initializeApp);

ap-pos/index.html

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+<!doctype html>
+<html lang="es">
+<head>
+  <meta charset="utf-8" />
+  <meta name="viewport" content="width=device-width, initial-scale=1" />
+  <title>AP-POS — v0.2.1</title>
+  <link rel="stylesheet" href="styles.css?v=1.1" />
+</head>
+<body>
+  <main class="container">
+    <header class="main-header">
+      <!-- Logo del negocio en lugar de texto -->
+      <img src="src/logo.png" alt="Ale Ponce" class="header-logo">
+      <nav class="tabs">
+        <button type="button" class="tab-link active" data-tab="tab-movements">Recibos</button>
+        <button type="button" class="tab-link" data-tab="tab-clients">Clientes</button>
+        <button type="button" class="tab-link" data-tab="tab-settings">Configuración</button>
+      </nav>
+    </header>
+
+    <!-- Pestaña de Movimientos/Recibos -->
+    <div id="tab-movements" class="tab-content active">
+      <div class="section">
+        <h2>Nuevo Movimiento</h2>
+        <form id="formMove">
+          <div class="form-grid">
+            <label>Cliente:</label>
+            <div>
+              <input type="text" id="m-cliente" list="client-list" required autocomplete="off" />
+              <datalist id="client-list"></datalist>
+            </div>
+            <label>Tipo:</label>
+            <select id="m-tipo" required>
+              <option value="Pago">Pago</option>
+              <option value="Anticipo">Anticipo</option>
+            </select>
+            <label>Monto (MXN):</label><input type="number" id="m-monto" step="0.01" min="0" required />
+            <label>Método:</label>
+            <select id="m-metodo">
+              <option value="">-- Opcional --</option>
+              <option value="Efectivo">Efectivo</option>
+              <option value="Tarjeta">Tarjeta</option>
+              <option value="Transferencia">Transferencia</option>
+              <option value="Depósito">Depósito</option>
+              <option value="Otros">Otros</option>
+            </select>
+            <label>Concepto:</label><input type="text" id="m-concepto" />
+            <label>Atendió:</label><input type="text" id="m-staff" />
+            <label>Notas:</label><textarea id="m-notas" rows="2"></textarea>
+          </div>
+          <div class="form-actions">
+            <button type="submit">Guardar y Generar Recibo</button>
+            <button type="reset" class="btn-danger">Limpiar</button>
+          </div>
+        </form>
+      </div>
+
+      <div class="section">
+        <h2>Movimientos Recientes</h2>
+        <button id="btnExport" class="btn-secondary">Exportar a CSV</button>
+        <div class="table-wrapper">
+          <table id="tblMoves">
+            <thead>
+              <tr>
+                <th>Folio</th>
+                <th>Fecha</th>
+                <th>Cliente</th>
+                <th>Tipo</th>
+                <th>Monto</th>
+                <th>Acciones</th>
+              </tr>
+            </thead>
+            <tbody></tbody>
+          </table>
+        </div>
+      </div>
+    </div>
+
+    <!-- Pestaña de Clientes -->
+    <div id="tab-clients" class="tab-content">
+      <div class="section">
+        <h2>Administrar Clientes</h2>
+        <form id="formClient">
+          <input type="hidden" id="c-id" />
+          <div class="form-grid client-grid">
+            <label>Nombre:</label>
+            <input type="text" id="c-nombre" required />
+            <label>Teléfono:</label>
+            <input type="tel" id="c-telefono" />
+            <label>Cumpleaños:</label>
+            <input type="date" id="c-cumple" />
+            <label></label> <!-- Etiqueta vacía para alinear el checkbox -->
+            <div class="checkbox-container">
+              <input type="checkbox" id="c-consent" />
+              <label for="c-consent">Consentimiento médico</label>
+            </div>
+          </div>
+          <div class="form-actions">
+            <button type="submit">Guardar Cliente</button>
+            <button type="reset" id="btnCancelEditClient" class="btn-danger">Limpiar</button>
+          </div>
+        </form>
+      </div>
+      <div class="section">
+        <h2>Lista de Clientes</h2>
+        <div class="table-wrapper">
+          <table id="tblClients">
+            <thead>
+              <tr>
+                <th>Nombre</th>
+                <th>Teléfono</th>
+                <th>Cumpleaños</th>
+                <th>Consentimiento</th>
+                <th>Acciones</th>
+              </tr>
+            </thead>
+            <tbody></tbody>
+          </table>
+        </div>
+      </div>
+    </div>
+
+    <!-- Pestaña de Configuración -->
+    <div id="tab-settings" class="tab-content">
+      <div class="section">
+        <h2>Configuración del Negocio</h2>
+        <form id="formSettings">
+          <div class="form-grid">
+            <label>Nombre del negocio:</label><input type="text" id="s-negocio" required />
+            <label>Eslogan (opcional):</label><input type="text" id="s-tagline" />
+            <label>Calle y Número:</label><input type="text" id="s-calle" placeholder="Ej: Av. Siempre Viva 123" />
+            <label>Colonia y C.P.:</label><input type="text" id="s-colonia-cp" placeholder="Ej: Centro, 25000" />
+            <label>Teléfono:</label><input type="text" id="s-tel" />
+            <label>RFC:</label><input type="text" id="s-rfc" />
+            <label>Leyenda pie de ticket:</label><input type="text" id="s-leyenda" />
+            <label>Prefijo de folio:</label><input type="text"id="s-folioPrefix" />
+          </div>
+          <div class="form-actions">
+            <button type="submit">Guardar Configuración</button>
+            <button type="button" id="btnTestTicket" class="btn-secondary">Probar Ticket</button>
+          </div>
+        </form>
+      </div>
+      <div class="section">
+        <h2>Ubicación de los Datos</h2>
+        <p class="data-location-info">
+          Toda la información de tu negocio (clientes, recibos y configuración) se guarda de forma segura en el archivo <strong>ap-pos.db</strong>, ubicado en la misma carpeta que la aplicación. Para hacer un respaldo, simplemente copia este archivo.
+        </p>
+      </div>
+    </div>
+  </main>
+
+  <!-- Área de impresión oculta -->
+  <div id="printArea" class="no-print"></div>
+
+  <script type="module" src="app.js?v=1.3"></script>
+</body>
+</html>

ap-pos/package.json

@@ -0,0 +1,17 @@
+{
+  "name": "ap-pos",
+  "version": "1.0.0",
+  "main": "app.js",
+  "scripts": {
+    "start": "node server.js"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "description": "",
+  "dependencies": {
+    "cors": "^2.8.5",
+    "express": "^5.1.0",
+    "sqlite3": "^5.1.7"
+  }
+}

ap-pos/print.js

@@ -0,0 +1,71 @@
+/**
+ * Escapa caracteres HTML para prevenir XSS.
+ * @param {string} str El string a escapar.
+ * @returns {string} El string escapado.
+ */
+function esc(str) {
+  return String(str || '').replace(/[&<>"']/g, c => ({
+    "&": "&amp;",
+    "<": "&lt;",
+    ">": "&gt;",
+    "\"": "&quot;",
+    "'": "&#39;"
+  }[c]));
+}
+
+/**
+ * Genera el HTML para un ticket de movimiento.
+ * @param {object} mov El objeto del movimiento.
+ * @param {object} settings El objeto de configuración.
+ * @returns {string} El HTML del ticket.
+ */
+function templateTicket(mov, settings) {
+  const dt = new Date(mov.fechaISO || Date.now());
+  const fechaLocal = dt.toLocaleString('es-MX', { dateStyle: 'medium', timeStyle: 'short' });
+  const montoFormateado = Number(mov.monto).toFixed(2);
+
+  const lines = [];
+  lines.push('<div class="ticket">');
+  lines.push('<img src="src/logo.png" alt="Logo" class="t-logo">');
+  
+  if (settings.negocio) lines.push(`<div class="t-center t-bold">${esc(settings.negocio)}</div>`);
+  if (settings.tagline) lines.push(`<div class="t-center t-tagline">${esc(settings.tagline)}</div>`);
+  if (settings.rfc) lines.push(`<div class="t-center t-small">RFC: ${esc(settings.rfc)}</div>`);
+  if (settings.sucursal) lines.push(`<div class="t-center t-small">${esc(settings.sucursal)}</div>`);
+  if (settings.tel) lines.push(`<div class="t-center t-small">Tel: ${esc(settings.tel)}</div>`);
+  
+  lines.push('<div class="t-divider"></div>');
+  lines.push(`<div class="t-row t-small"><span>Folio:</span><span>${esc(mov.folio)}</span></div>`);
+  lines.push(`<div class="t-row t-small"><span>Fecha:</span><span>${esc(fechaLocal)}</span></div>`);
+  
+  lines.push('<div class="t-divider"></div>');
+  lines.push(`<div><span class="t-bold">${esc(mov.tipo)}</span></div>`);
+  if (mov.cliente) lines.push(`<div class="t-small">Cliente: ${esc(mov.cliente)}</div>`);
+  if (mov.concepto) lines.push(`<div class="t-small">Concepto: ${esc(mov.concepto)}</div>`);
+  if (mov.staff)  lines.push(`<div class="t-small">Atendió: ${esc(mov.staff)}</div>`);
+  if (mov.metodo) lines.push(`<div class="t-small">Método: ${esc(mov.metodo)}</div>`);
+  if (mov.notas)  lines.push(`<div class="t-small">Notas: ${esc(mov.notas)}</div>`);
+  
+  lines.push('<div class="t-divider"></div>');
+  lines.push(`<div class="t-row t-bold"><span>Total</span><span>$${montoFormateado}</span></div>`);
+  
+  if (settings.leyenda) lines.push(`<div class="t-footer t-center t-small">${esc(settings.leyenda)}</div>`);
+  
+  lines.push('</div>');
+  return lines.join('');
+}
+
+/**
+ * Renderiza el ticket en el DOM y llama a la función de impresión del navegador.
+ * @param {object} mov El objeto del movimiento.
+ * @param {object} settings El objeto de configuración.
+ */
+export function renderTicketAndPrint(mov, settings) {
+  const printArea = document.getElementById('printArea');
+  if (printArea) {
+    printArea.innerHTML = templateTicket(mov, settings);
+    window.print();
+  } else {
+    console.error("El área de impresión #printArea no se encontró.");
+  }
+}

ap-pos/server.js

@@ -0,0 +1,158 @@
+
+const express = require('express');
+const sqlite3 = require('sqlite3').verbose();
+const cors = require('cors');
+const path = require('path');
+
+const app = express();
+const port = 3000;
+
+app.use(cors());
+app.use(express.json());
+
+// Servir archivos estáticos (CSS, JS, imágenes)
+app.use(express.static(__dirname));
+
+// Ruta principal para servir el index.html
+app.get('/', (req, res) => {
+  res.sendFile(path.join(__dirname, 'index.html'));
+});
+
+// Initialize SQLite database
+const db = new sqlite3.Database('./ap-pos.db', (err) => {
+    if (err) {
+        console.error(err.message);
+    }
+    console.log('Connected to the ap-pos.db database.');
+});
+
+// Create tables if they don't exist
+db.serialize(() => {
+    db.run(`CREATE TABLE IF NOT EXISTS settings (
+        key TEXT PRIMARY KEY,
+        value TEXT
+    )`);
+
+    db.run(`CREATE TABLE IF NOT EXISTS clients (
+        id TEXT PRIMARY KEY,
+        nombre TEXT,
+        telefono TEXT,
+        cumpleaños TEXT,
+        consentimiento INTEGER
+    )`);
+
+    db.run(`CREATE TABLE IF NOT EXISTS movements (
+        id TEXT PRIMARY KEY,
+        folio TEXT,
+        fechaISO TEXT,
+        clienteId TEXT,
+        tipo TEXT,
+        monto REAL,
+        metodo TEXT,
+        concepto TEXT,
+        staff TEXT,
+        notas TEXT,
+        FOREIGN KEY (clienteId) REFERENCES clients (id)
+    )`);
+});
+
+// API routes will go here
+
+// --- Settings ---
+app.get('/api/settings', (req, res) => {
+    db.get("SELECT value FROM settings WHERE key = 'settings'", (err, row) => {
+        if (err) {
+            res.status(500).json({ error: err.message });
+            return;
+        }
+        res.json(row ? JSON.parse(row.value) : {});
+    });
+});
+
+app.post('/api/settings', (req, res) => {
+    const { settings } = req.body;
+    const value = JSON.stringify(settings);
+    db.run(`INSERT OR REPLACE INTO settings (key, value) VALUES ('settings', ?)`, [value], function(err) {
+        if (err) {
+            res.status(500).json({ error: err.message });
+            return;
+        }
+        res.json({ message: 'Settings saved' });
+    });
+});
+
+// --- Clients ---
+app.get('/api/clients', (req, res) => {
+    db.all("SELECT * FROM clients", [], (err, rows) => {
+        if (err) {
+            res.status(500).json({ error: err.message });
+            return;
+        }
+        res.json(rows);
+    });
+});
+
+app.post('/api/clients', (req, res) => {
+    const { client } = req.body;
+    const { id, nombre, telefono, cumpleaños, consentimiento } = client;
+    db.run(`INSERT OR REPLACE INTO clients (id, nombre, telefono, cumpleaños, consentimiento) VALUES (?, ?, ?, ?, ?)`,
+        [id, nombre, telefono, cumpleaños, consentimiento], function(err) {
+        if (err) {
+            res.status(500).json({ error: err.message });
+            return;
+        }
+        res.json({ id });
+    });
+});
+
+app.delete('/api/clients/:id', (req, res) => {
+    const { id } = req.params;
+    db.run(`DELETE FROM clients WHERE id = ?`, id, function(err) {
+        if (err) {
+            res.status(500).json({ error: err.message });
+            return;
+        }
+        res.json({ message: 'Client deleted' });
+    });
+});
+
+
+// --- Movements ---
+app.get('/api/movements', (req, res) => {
+    db.all("SELECT * FROM movements ORDER BY fechaISO DESC", [], (err, rows) => {
+        if (err) {
+            res.status(500).json({ error: err.message });
+            return;
+        }
+        res.json(rows);
+    });
+});
+
+app.post('/api/movements', (req, res) => {
+    const { movement } = req.body;
+    const { id, folio, fechaISO, clienteId, tipo, monto, metodo, concepto, staff, notas } = movement;
+    db.run(`INSERT INTO movements (id, folio, fechaISO, clienteId, tipo, monto, metodo, concepto, staff, notas)
+        VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?)`,
+        [id, folio, fechaISO, clienteId, tipo, monto, metodo, concepto, staff, notas], function(err) {
+        if (err) {
+            res.status(500).json({ error: err.message });
+            return;
+        }
+        res.json({ id });
+    });
+});
+
+app.delete('/api/movements/:id', (req, res) => {
+    const { id } = req.params;
+    db.run(`DELETE FROM movements WHERE id = ?`, id, function(err) {
+        if (err) {
+            res.status(500).json({ error: err.message });
+            return;
+        }
+        res.json({ message: 'Movement deleted' });
+    });
+});
+
+app.listen(port, () => {
+    console.log(`Server running at http://localhost:${port}`);
+});

ap-pos/storage.js

@@ -0,0 +1,71 @@
+const API_URL = 'http://localhost:3000/api';
+
+export const KEY_DATA = 'movements';
+export const KEY_SETTINGS = 'settings';
+export const KEY_CLIENTS = 'clients';
+
+/**
+ * Carga datos desde el servidor.
+ * @param {string} key La clave que representa el endpoint (e.g., 'clients').
+ * @param {any} defaultValue El valor a devolver si la carga falla.
+ * @returns {Promise<any>} Los datos parseados o el valor por defecto.
+ */
+export async function load(key, defaultValue) {
+  try {
+    const response = await fetch(`${API_URL}/${key}`);
+    if (!response.ok) {
+      throw new Error(`Network response was not ok for key: ${key}`);
+    }
+    const data = await response.json();
+    // Si el servidor devuelve nulo, usar el valor por defecto para evitar errores.
+    if (data === null) {
+      console.warn(`Server returned null for key "${key}", using default value.`);
+      return defaultValue;
+    }
+    return data;
+  } catch (error) {
+    console.error(`Error al cargar datos desde el servidor para la clave "${key}"`, error);
+    return defaultValue;
+  }
+}
+
+/**
+ * Guarda datos en el servidor.
+ * @param {string} key La clave que representa el endpoint.
+ * @param {any} data Los datos a guardar.
+ */
+export async function save(key, data) {
+  try {
+    const response = await fetch(`${API_URL}/${key}`, {
+      method: 'POST',
+      headers: {
+        'Content-Type': 'application/json',
+      },
+      body: JSON.stringify(data), // Envuelve los datos en un objeto con la clave principal
+    });
+    if (!response.ok) {
+      throw new Error(`Network response was not ok for key: ${key}`);
+    }
+  } catch (error) {
+    console.error(`Error al guardar datos en el servidor para la clave "${key}"`, error);
+  }
+}
+
+/**
+ * Elimina un item por su ID.
+ * @param {string} key La clave que representa el endpoint (e.g., 'clients').
+ * @param {string} id El ID del item a eliminar.
+ */
+export async function remove(key, id) {
+    try {
+        const response = await fetch(`${API_URL}/${key}/${id}`, {
+            method: 'DELETE',
+        });
+        if (!response.ok) {
+            throw new Error(`Network response was not ok for key: ${key} and id: ${id}`);
+        }
+    } catch (error) {
+        console.error(`Error al eliminar el item con id "${id}" desde "${key}"`, error);
+    }
+}
+

ap-pos/styles.css

@@ -0,0 +1,310 @@
+/* --- Estilos Minimalistas y Elegantes --- */
+
+/* Paleta de colores:
+  - Fondo: #f8f9fa (gris muy claro)
+  - Texto principal: #212529 (casi negro)
+  - Bordes/Divisores: #dee2e6 (gris claro)
+  - Botón primario: #343a40 (gris oscuro)
+  - Botón secundario: #6c757d (gris medio)
+*/
+
+/* Estilos generales */
+body {
+  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
+  margin: 0;
+  background-color: #f8f9fa;
+  color: #212529;
+  -webkit-font-smoothing: antialiased;
+  -moz-osx-font-smoothing: grayscale;
+}
+
+.container {
+  max-width: 800px;
+  margin: 30px auto;
+  padding: 25px 30px;
+  background: #fff;
+  border-radius: 8px;
+  box-shadow: 0 4px 20px rgba(0,0,0,0.05);
+}
+
+h1, h2 {
+  color: #212529;
+  border-bottom: 1px solid #dee2e6;
+  padding-bottom: 12px;
+  margin-top: 0;
+  margin-bottom: 25px;
+}
+
+h1 {
+  font-size: 28px;
+}
+
+h2 {
+  font-size: 22px;
+}
+
+.section {
+  margin-bottom: 40px;
+}
+
+/* Formularios */
+.form-grid {
+  display: grid;
+  grid-template-columns: 160px 1fr;
+  gap: 18px;
+  align-items: center;
+}
+
+label {
+  font-weight: 500;
+  text-align: right;
+  color: #495057;
+}
+
+input[type="text"],
+input[type="number"],
+select,
+textarea {
+  width: 100%;
+  padding: 10px;
+  border: 1px solid #ced4da;
+  border-radius: 5px;
+  box-sizing: border-box;
+  transition: border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
+}
+input:focus, select:focus, textarea:focus {
+  border-color: #80bdff;
+  outline: 0;
+  box-shadow: 0 0 0 0.2rem rgba(0,123,255,.25);
+}
+
+button {
+  background-color: #343a40;
+  color: white;
+  padding: 10px 18px;
+  border: none;
+  border-radius: 5px;
+  cursor: pointer;
+  font-size: 14px;
+  font-weight: 500;
+  margin-right: 10px;
+  transition: background-color 0.2s;
+}
+
+button:hover {
+  background-color: #212529;
+}
+
+button[type="reset"], button#btnTestTicket, #btnExport {
+  background-color: #6c757d;
+}
+button[type="reset"]:hover, button#btnTestTicket:hover, #btnExport:hover, .btn-secondary:hover {
+  background-color: #5a6268;
+}
+
+.btn-danger {
+  background-color: #dc3545;
+}
+.btn-danger:hover {
+  background-color: #c82333;
+}
+
+.form-actions button {
+  margin-right: 0; /* Remove right margin */
+  margin-left: 10px; /* Add left margin for spacing */
+}
+
+.form-actions {
+  /* Empuja los botones a la derecha en el grid */
+  grid-column-start: 2;
+  margin-top: 20px; /* Aumentar espacio superior */
+  display: flex;
+  justify-content: flex-end; /* Alinea botones a la derecha */
+}
+
+/* Tabla */
+.table-wrapper {
+  overflow-x: auto;
+  border: 1px solid #dee2e6;
+  border-radius: 5px;
+}
+
+#tblMoves, #tblClients {
+  width: 100%;
+  border-collapse: collapse;
+  margin: 0;
+}
+
+#tblMoves th, #tblMoves td,
+#tblClients th, #tblClients td {
+  border-bottom: 1px solid #dee2e6;
+  padding: 12px 15px;
+  text-align: left;
+  white-space: nowrap;
+}
+#tblMoves td:last-child, #tblMoves th:last-child,
+#tblClients td:last-child, #tblClients th:last-child {
+  text-align: center;
+}
+
+#tblMoves th, #tblClients th {
+  background-color: #f8f9fa;
+  font-weight: 600;
+  border-bottom-width: 2px;
+}
+
+#tblMoves tbody tr:last-child td,
+#tblClients tbody tr:last-child td {
+  border-bottom: none;
+}
+
+.action-btn {
+  background: none;
+  border: none;
+  color: #007bff;
+  cursor: pointer;
+  padding: 5px;
+  font-size: 13px;
+  text-decoration: none;
+}
+.action-btn:hover {
+  text-decoration: underline;
+}
+button.action-btn {
+  color: #dc3545;
+}
+
+/* Estilos del Ticket */
+.ticket {
+  width: 58mm;
+  max-width: 58mm;
+  background: #fff;
+  color: #000;
+  padding: 10px;
+  box-sizing: border-box;
+  font: 12px/1.3 ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
+  border: 1px solid #ccc; /* Visible en pantalla, no en impresión */
+}
+.t-logo {
+  display: block;
+  margin: 0 auto 8px auto;
+  max-width: 75%;
+  height: auto;
+}
+.t-center { text-align: center; }
+.t-bold { font-weight: bold; }
+.t-tagline { font-size: 11px; margin-bottom: 6px; }
+.t-small { font-size: 10px; }
+.t-divider { border-top: 1px dashed #000; margin: 8px 0; }
+.t-row { display: flex; justify-content: space-between; }
+.t-footer { margin-top: 10px; }
+
+
+/***** MODO IMPRESIÓN *****/
+@media print {
+  body {
+    background: #fff;
+    color: #000;
+    margin: 0;
+  }
+  
+  .no-print, .container {
+    display: none !important;
+  }
+
+  #printArea {
+    display: block !important;
+  }
+  
+  @page {
+    size: 58mm auto;
+    margin: 0;
+  }
+  
+  .ticket {
+    border: none;
+    width: 100%;
+    max-width: 100%;
+    padding: 0;
+  }
+}
+
+/* --- Estilos de Pestañas --- */
+.main-header {
+  display: flex;
+  justify-content: space-between;
+  align-items: center;
+  margin-bottom: 25px;
+  border-bottom: 1px solid #dee2e6;
+}
+
+.main-header h1 {
+  border-bottom: none;
+  margin-bottom: 0;
+  padding-bottom: 0;
+}
+
+/* Logo en header */
+.main-header .header-logo {
+  max-height: 50px;
+  width: auto;
+}
+
+.tabs {
+  display: flex;
+}
+
+.tab-link {
+  padding: 10px 20px;
+  cursor: pointer;
+  background: none;
+  border: none;
+  font-size: 16px;
+  color: #6c757d;
+  border-bottom: 2px solid transparent;
+  margin-bottom: -1px;
+}
+
+.tab-link.active {
+  color: #343a40;
+  border-bottom-color: #343a40;
+}
+
+.tab-content {
+  display: none;
+}
+
+.tab-content.active {
+  display: block;
+}
+
+/* --- Estilos específicos de Clientes --- */
+.client-grid {
+  display: grid;
+  grid-template-columns: 120px 1fr 120px 1fr; /* Dos columnas de etiquetas y campos */
+  gap: 18px 12px; /* Espacio vertical y horizontal */
+  align-items: center;
+}
+
+.client-grid .checkbox-container {
+  grid-column: 2 / span 3; /* El checkbox ocupa las columnas de la derecha */
+  display: flex;
+  align-items: center;
+}
+
+.checkbox-container input[type="checkbox"] {
+  width: auto;
+  margin-right: 8px;
+}
+
+/* --- Estilos de Configuración --- */
+.data-location-info {
+  background-color: #e9ecef;
+  padding: 15px;
+  border-radius: 5px;
+  font-size: 14px;
+  line-height: 1.5;
+}
+.data-location-info strong {
+  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
+}