♻️ (pagetop): Sustituye StyleSheet::inline

- `StyleSheet::inline` se resuelve ahora con `ResponsiveStyles`.
- `StyleSheet` se simplifica a sólo hojas de estilo externas.
- `ResponsiveStyles` añade `add_styles()` para declarar varias
  propiedades en una sola llamada.
- `AssetsOp` gana un constructor por variante y conversiones
  "From<Favicon/Preload/StyleSheet/JavaScript>" para pasarlos
  directamente a `with_assets()`.

src/base/theme/basic.rs

@@ -14,28 +14,26 @@ impl Extension for Basic {
 #[async_trait]
 impl Theme for Basic {
     fn before_render_page_body(&self, page: &mut Page) {
-        page.alter_assets(AssetsOp::AddStyleSheet(
+        page.alter_assets(
             StyleSheet::from("/pagetop/css/normalize.css")
                 .with_version("8.0.1")
                 .with_weight(-99),
-        ))
-        .alter_assets(AssetsOp::AddStyleSheet(
+        )
+        .alter_assets(
             StyleSheet::from("/pagetop/css/basic.min.css")
                 .with_version(PAGETOP_VERSION)
                 .with_weight(-99),
-        ))
-        .alter_assets(AssetsOp::AddJavaScript(
-            JavaScript::defer("/pagetop/js/basic.menu.min.js").with_version("4.4.0"),
-        ))
-        .alter_assets(AssetsOp::AddJavaScript(
+        )
+        .alter_assets(JavaScript::defer("/pagetop/js/basic.menu.min.js").with_version("4.4.0"))
+        .alter_assets(
             JavaScript::defer("/pagetop/js/basic.dropdown.min.js").with_version(PAGETOP_VERSION),
-        ))
-        .alter_assets(AssetsOp::AddJavaScript(
+        )
+        .alter_assets(
             JavaScript::defer("/pagetop/js/basic.navbar.init.js").with_version(PAGETOP_VERSION),
-        ))
-        .alter_assets(AssetsOp::AddJavaScript(
+        )
+        .alter_assets(
             JavaScript::defer("/pagetop/js/basic.dialog.min.js").with_version(PAGETOP_VERSION),
-        ))
+        )
         .alter_child_in(
             &CoreRegions::Footer,
             ChildOp::AddIfEmpty(PoweredBy::new().into()),