feat(adsense): agregar mas opciones de formato y altura para Rail Ads

- Formatos: skyscraper (160x600), wide-skyscraper (160x800), half-page (300x600), large-skyscraper (300x1050)
- Distancia desde arriba: 150, 200, 300 (default), 400, 500, 700px
- Cambiar rail_top_offset de text a select con opciones predefinidas

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Schemas/adsense-placement.json

@@ -225,15 +225,28 @@
           "label": "Formato Rail Ads",
           "default": "skyscraper",
           "editable": true,
-          "options": ["skyscraper", "half-page"],
-          "description": "skyscraper=160x600, half-page=300x600"
+          "options": {
+            "skyscraper": "Skyscraper (160x600)",
+            "wide-skyscraper": "Wide Skyscraper (160x800)",
+            "half-page": "Half Page (300x600)",
+            "large-skyscraper": "Large Skyscraper (300x1050)"
+          },
+          "description": "Tamano del anuncio en los rails laterales"
         },
         "rail_top_offset": {
-          "type": "text",
-          "label": "Distancia desde arriba (px)",
-          "default": "150",
+          "type": "select",
+          "label": "Distancia desde arriba",
+          "default": "300",
           "editable": true,
-          "description": "Espacio desde el top del viewport"
+          "options": {
+            "150": "150px (Cerca del header)",
+            "200": "200px",
+            "300": "300px (Recomendado)",
+            "400": "400px",
+            "500": "500px",
+            "700": "700px (Debajo del fold)"
+          },
+          "description": "Distancia vertical desde el top del viewport"
         }
       }
     },