feat(voice): implementa voz y TTS en chats POS y dashboard

- Agrega TTS (speechSynthesis) a chat.js del POS para leer respuestas IA
- Copia lógica de voz completa (STT + TTS) a dashboard/chat-public.js
- Extiende estilos TTS en chat.css y chat-public.css
- Agrega chat widget a 13 templates POS que no lo tenían
- Corrige duplicado de chat.css en diagrams.html
- Minifica assets actualizados
- 73/73 tests pasan

pos/templates/accounting.html

@@ -5,6 +5,7 @@
   <meta charset="UTF-8" />
   <meta name="viewport" content="width=device-width, initial-scale=1.0" />
   <title>Contabilidad — Nexus Autoparts POS</title>
+  <link rel="stylesheet" href="/pos/static/css/chat.css" />
   <link rel="stylesheet" href="/pos/static/css/tokens.css" />
   <link rel="stylesheet" href="/pos/static/css/common.css" />
   <link rel="stylesheet" href="/pos/static/css/sidebar.css" />
@@ -495,5 +496,6 @@
   <script src="/pos/static/js/sync-engine.js" defer></script>
   <script>if('serviceWorker' in navigator){navigator.serviceWorker.register('/pos/sw.js',{scope:'/pos/'});}</script>
 
+  <script src="/pos/static/js/chat.js" defer></script>
 </body>
 </html>

pos/templates/config.html

@@ -5,6 +5,7 @@
   <meta charset="UTF-8" />
   <meta name="viewport" content="width=device-width, initial-scale=1.0" />
   <title>Configuración — Nexus Autoparts POS</title>
+  <link rel="stylesheet" href="/pos/static/css/chat.css" />
   <link rel="stylesheet" href="/pos/static/css/tokens.css" />
   <link rel="stylesheet" href="/pos/static/css/common.css" />
   <link rel="stylesheet" href="/pos/static/css/sidebar.css" />
@@ -688,5 +689,6 @@
   <script src="/pos/static/js/sync-engine.js" defer></script>
   <script>if('serviceWorker' in navigator){navigator.serviceWorker.register('/pos/sw.js',{scope:'/pos/'});}</script>
 
+  <script src="/pos/static/js/chat.js" defer></script>
 </body>
 </html>

pos/templates/customers.html

@@ -5,6 +5,7 @@
   <meta charset="UTF-8" />
   <meta name="viewport" content="width=device-width, initial-scale=1.0" />
   <title>Nexus Autoparts — Clientes</title>
+  <link rel="stylesheet" href="/pos/static/css/chat.css" />
   <link rel="stylesheet" href="/pos/static/css/tokens.css" />
   <link rel="stylesheet" href="/pos/static/css/common.css" />
   <link rel="stylesheet" href="/pos/static/css/sidebar.css" />
@@ -623,5 +624,6 @@
   <script src="/pos/static/js/offline-banner.js" defer></script>
   <script src="/pos/static/js/sync-engine.js" defer></script>
   <script>if('serviceWorker' in navigator){navigator.serviceWorker.register('/pos/sw.js',{scope:'/pos/'});}</script>
+  <script src="/pos/static/js/chat.js" defer></script>
 </body>
 </html>

pos/templates/dashboard.html

@@ -5,6 +5,7 @@
   <meta charset="UTF-8" />
   <meta name="viewport" content="width=device-width, initial-scale=1.0" />
   <title>Nexus Autoparts — Dashboard</title>
+  <link rel="stylesheet" href="/pos/static/css/chat.css" />
   <link rel="stylesheet" href="/pos/static/css/tokens.css" />
   <link rel="stylesheet" href="/pos/static/css/common.css" />
   <link rel="stylesheet" href="/pos/static/css/sidebar.css" />
@@ -460,5 +461,6 @@
   <script src="/pos/static/js/sync-engine.js" defer></script>
   <script>if('serviceWorker' in navigator){navigator.serviceWorker.register('/pos/sw.js',{scope:'/pos/'});}</script>
 
+  <script src="/pos/static/js/chat.js" defer></script>
 </body>
 </html>

pos/templates/diagrams.html

@@ -5,11 +5,11 @@
   <meta charset="UTF-8" />
   <meta name="viewport" content="width=device-width, initial-scale=1.0" />
   <title>Diagramas — Nexus Autoparts POS</title>
+  <link rel="stylesheet" href="/pos/static/css/chat.css" />
   <link rel="stylesheet" href="/pos/static/css/tokens.css" />
   <link rel="stylesheet" href="/pos/static/css/common.css" />
   <link rel="stylesheet" href="/pos/static/css/sidebar.css" />
   <link rel="stylesheet" href="/pos/static/css/pos-glass.css" />
-  <link rel="stylesheet" href="/pos/static/css/chat.css" />
   <link rel="stylesheet" href="/pos/static/css/onboarding.css" />
   <link rel="manifest" href="/pos/static/pwa/manifest.json" />
   <meta name="theme-color" content="#F5A623" />
@@ -154,5 +154,6 @@
   <script src="/pos/static/js/sidebar.js" defer></script>
   <script src="/pos/static/js/diagrams.js" defer></script>
   <script>if('serviceWorker' in navigator){navigator.serviceWorker.register('/pos/sw.js',{scope:'/pos/'});}</script>
+  <script src="/pos/static/js/chat.js" defer></script>
 </body>
 </html>

pos/templates/fleet.html

@@ -5,6 +5,7 @@
   <meta charset="UTF-8" />
   <meta name="viewport" content="width=device-width, initial-scale=1.0" />
   <title>Flotillas — Nexus Autoparts POS</title>
+  <link rel="stylesheet" href="/pos/static/css/chat.css" />
   <link rel="stylesheet" href="/pos/static/css/tokens.css" />
   <link rel="stylesheet" href="/pos/static/css/common.css" />
   <link rel="stylesheet" href="/pos/static/css/sidebar.css" />
@@ -308,5 +309,6 @@
 <script src="/pos/static/js/offline-banner.js" defer></script>
 <script>if('serviceWorker' in navigator){navigator.serviceWorker.register('/pos/sw.js',{scope:'/pos/'});}</script>
 
+  <script src="/pos/static/js/chat.js" defer></script>
 </body>
 </html>

pos/templates/inventory.html

@@ -5,6 +5,7 @@
   <meta charset="UTF-8" />
   <meta name="viewport" content="width=device-width, initial-scale=1.0" />
   <title>Inventario — Nexus Autoparts POS</title>
+  <link rel="stylesheet" href="/pos/static/css/chat.css" />
   <link rel="stylesheet" href="/pos/static/css/tokens.css" />
   <link rel="stylesheet" href="/pos/static/css/common.css" />
   <link rel="stylesheet" href="/pos/static/css/sidebar.css" />
@@ -818,5 +819,6 @@
   <script src="/pos/static/js/offline-banner.js" defer></script>
   <script src="/pos/static/js/sync-engine.js" defer></script>
   <script>if('serviceWorker' in navigator){navigator.serviceWorker.register('/pos/sw.js',{scope:'/pos/'});}</script>
+  <script src="/pos/static/js/chat.js" defer></script>
 </body>
 </html>

pos/templates/invoicing.html

@@ -5,6 +5,7 @@
   <meta charset="UTF-8" />
   <meta name="viewport" content="width=device-width, initial-scale=1.0" />
   <title>Facturación CFDI — Nexus Autoparts POS</title>
+  <link rel="stylesheet" href="/pos/static/css/chat.css" />
   <link rel="stylesheet" href="/pos/static/css/tokens.css" />
   <link rel="stylesheet" href="/pos/static/css/common.css" />
   <link rel="stylesheet" href="/pos/static/css/sidebar.css" />
@@ -1057,5 +1058,6 @@
   <script src="/pos/static/js/sync-engine.js" defer></script>
   <script>if('serviceWorker' in navigator){navigator.serviceWorker.register('/pos/sw.js',{scope:'/pos/'});}</script>
 
+  <script src="/pos/static/js/chat.js" defer></script>
 </body>
 </html>

pos/templates/marketplace.html

@@ -5,6 +5,7 @@
   <meta charset="UTF-8" />
   <meta name="viewport" content="width=device-width, initial-scale=1.0" />
   <title>Marketplace B2B — Nexus Autoparts POS</title>
+  <link rel="stylesheet" href="/pos/static/css/chat.css" />
   <link rel="stylesheet" href="/pos/static/css/tokens.css" />
   <link rel="stylesheet" href="/pos/static/css/common.css" />
   <link rel="stylesheet" href="/pos/static/css/sidebar.css" />
@@ -512,5 +513,6 @@
     }
   })();
   </script>
+  <script src="/pos/static/js/chat.js" defer></script>
 </body>
 </html>

pos/templates/quotations.html

@@ -5,6 +5,7 @@
   <meta charset="UTF-8" />
   <meta name="viewport" content="width=device-width, initial-scale=1.0" />
   <title>Cotizaciones — Nexus Autoparts POS</title>
+  <link rel="stylesheet" href="/pos/static/css/chat.css" />
   <link rel="stylesheet" href="/pos/static/css/tokens.css" />
   <link rel="stylesheet" href="/pos/static/css/common.css" />
   <link rel="stylesheet" href="/pos/static/css/sidebar.css" />
@@ -147,5 +148,6 @@
     loadQuotes();
   })();
   </script>
+  <script src="/pos/static/js/chat.js" defer></script>
 </body>
 </html>

pos/templates/reports.html

@@ -5,6 +5,7 @@
   <meta charset="UTF-8" />
   <meta name="viewport" content="width=device-width, initial-scale=1.0" />
   <title>Reportes — Nexus Autoparts POS</title>
+  <link rel="stylesheet" href="/pos/static/css/chat.css" />
   <link rel="stylesheet" href="/pos/static/css/tokens.css" />
   <link rel="stylesheet" href="/pos/static/css/common.css" />
   <link rel="stylesheet" href="/pos/static/css/sidebar.css" />
@@ -323,5 +324,6 @@
   <script src="/pos/static/js/sync-engine.js" defer></script>
   <script>if('serviceWorker' in navigator){navigator.serviceWorker.register('/pos/sw.js',{scope:'/pos/'});}</script>
 
+  <script src="/pos/static/js/chat.js" defer></script>
 </body>
 </html>

pos/templates/whatsapp.html

@@ -5,6 +5,7 @@
   <meta charset="UTF-8" />
   <meta name="viewport" content="width=device-width, initial-scale=1.0" />
   <title>WhatsApp — Nexus Autoparts POS</title>
+  <link rel="stylesheet" href="/pos/static/css/chat.css" />
   <link rel="stylesheet" href="/pos/static/css/tokens.css" />
   <link rel="stylesheet" href="/pos/static/css/common.css" />
   <link rel="stylesheet" href="/pos/static/css/sidebar.css" />
@@ -130,5 +131,6 @@ function posLogout(){localStorage.removeItem('pos_token');window.location.href='
 <script src="/pos/static/js/pos-utils.js" defer></script>
   <script src="/pos/static/js/sidebar.js" defer></script>
 
+  <script src="/pos/static/js/chat.js" defer></script>
 </body>
 </html>