feat: interfaz clara unificada en Centro de Mando

Shell con nav agrupada y activa, PageHeader común, tipografía y tokens.

Co-authored-by: Cursor <cursoragent@cursor.com>

tailwind.config.ts

@@ -9,6 +9,9 @@ const config: Config = {
   ],
   theme: {
     extend: {
+      fontFamily: {
+        sans: ['var(--font-sans)', 'ui-sans-serif', 'system-ui', 'sans-serif'],
+      },
       colors: {
         background: "#0B0F19",
         card: "#111827",
@@ -16,6 +19,8 @@ const config: Config = {
         border: "#1F2937",
         brand: {
           50: "#FFF8F0",
+          200: "#F5C796",
+          400: "#EDA05A",
           500: "#E58A3C",
           600: "#D07528",
           700: "#B35E1B"