feat(rail-ads): rails responsive que llenan el espacio disponible

- Ancho calculado automaticamente: (viewport - container) / 2 - 20px
- 10px margen del viewport + 10px gap al container
- Selector simplificado: solo altura (250-1050px)
- AdSense usa data-full-width-responsive para adaptarse
- Media query actualizada: oculta en pantallas < 1620px

Schemas/adsense-placement.json

@@ -222,42 +222,20 @@
         },
         "rail_format": {
           "type": "select",
-          "label": "Formato Rail Ads",
-          "default": "skyscraper",
+          "label": "Altura Rail Ads",
+          "default": "h600",
           "editable": true,
           "options": {
-            "w130-h300": "130x300",
-            "w130-h400": "130x400",
-            "w130-h500": "130x500",
-            "w130-h600": "130x600",
-            "w140-h300": "140x300",
-            "w140-h400": "140x400",
-            "w140-h500": "140x500",
-            "w140-h600": "140x600",
-            "w150-h300": "150x300",
-            "w150-h400": "150x400",
-            "w150-h500": "150x500",
-            "w150-h600": "150x600",
-            "slim-small": "160x300",
-            "slim-medium": "160x400",
-            "slim-large": "160x500",
-            "skyscraper": "160x600 (Skyscraper)",
-            "slim-xlarge": "160x700",
-            "wide-skyscraper": "160x800",
-            "w300-h250": "300x250 (Medium Rectangle)",
-            "half-page": "300x600 (Half Page)",
-            "large-skyscraper": "300x1050 (Large Skyscraper)",
-            "w400-h300": "400x300",
-            "w400-h400": "400x400",
-            "w400-h600": "400x600",
-            "w500-h300": "500x300",
-            "w500-h400": "500x400",
-            "w500-h600": "500x600",
-            "w600-h300": "600x300",
-            "w600-h400": "600x400",
-            "w600-h600": "600x600"
+            "h250": "250px (Compacto)",
+            "h300": "300px (Pequeno)",
+            "h400": "400px (Mediano)",
+            "h500": "500px",
+            "h600": "600px (Recomendado)",
+            "h700": "700px",
+            "h800": "800px (Grande)",
+            "h1050": "1050px (Extra grande)"
           },
-          "description": "Tamano del anuncio en los rails laterales"
+          "description": "Altura del anuncio. El ancho se ajusta automaticamente al espacio disponible."
         },
         "rail_top_offset": {
           "type": "select",