♻️ (bootsier): Sustituye BreakPoint por Breakpoint

Elimina el enum BreakPoint propio de Bootsier. Los componentes pasan a
usar el Breakpoint del núcleo, cuyo nombre y ancho resuelve el tema
activo.

extensions/pagetop-bootsier/tests/breakpoint_class.rs

@@ -0,0 +1,76 @@
+// Verifies that Bootsier builds its breakpoint-based Bootstrap classes from the breakpoint names
+// of `Bootsier::breakpoint_entry()`, and that `Xxxl` (absent in Bootstrap) resolves as `xxl`.
+
+use pagetop::prelude::*;
+use pagetop_bootsier::theme::*;
+
+fn cx() -> Context {
+    Context::default().with_theme(&pagetop_bootsier::Bootsier)
+}
+
+#[pagetop::test]
+async fn container_width_uses_breakpoint_name() {
+    let cx = cx();
+    assert_eq!(bs::container::Width::Default.to_class(&cx), "container");
+    assert_eq!(bs::container::Width::Fluid.to_class(&cx), "container-fluid");
+    assert_eq!(
+        bs::container::Width::From(Breakpoint::Lg).to_class(&cx),
+        "container-lg"
+    );
+}
+
+#[pagetop::test]
+async fn container_width_xxxl_resolves_as_xxl() {
+    let cx = cx();
+    assert_eq!(
+        bs::container::Width::From(Breakpoint::Xxxl).to_class(&cx),
+        "container-xxl"
+    );
+}
+
+#[pagetop::test]
+async fn dropdown_menu_align_combines_breakpoint_classes() {
+    let cx = cx();
+    assert_eq!(bs::dropdown::MenuAlign::Start.to_class(&cx), "");
+    assert_eq!(
+        bs::dropdown::MenuAlign::EndAt(Breakpoint::Md).to_class(&cx),
+        "dropdown-menu-md-end"
+    );
+    assert_eq!(
+        bs::dropdown::MenuAlign::StartAndEnd(Breakpoint::Xl).to_class(&cx),
+        "dropdown-menu-start dropdown-menu-xl-end"
+    );
+}
+
+#[pagetop::test]
+async fn navbar_expands_at_md_by_default_and_at_the_chosen_breakpoint() {
+    let item =
+        || bs::navbar::Item::nav(bs::Nav::new().with_item(bs::nav::Item::link(Lc::n("Home"), "/")));
+
+    let mut navbar = bs::Navbar::simple().with_item(item());
+    let html = navbar.render(&mut cx()).await.into_string();
+    assert!(html.contains("navbar-expand-md"));
+
+    let mut navbar = bs::Navbar::simple()
+        .with_expand(Breakpoint::Xxxl)
+        .with_item(item());
+    let html = navbar.render(&mut cx()).await.into_string();
+    assert!(html.contains("navbar-expand-xxl"));
+}
+
+#[pagetop::test]
+async fn offcanvas_uses_either_the_plain_or_the_breakpoint_class() {
+    // Bootstrap's `.offcanvas` is always fixed, so it must not accompany `.offcanvas-{bp}`.
+    let panel =
+        |offcanvas: bs::Offcanvas| offcanvas.with_child(Html::with(|_| html! { p { "Content" } }));
+
+    let mut plain = panel(bs::Offcanvas::new());
+    let html = plain.render(&mut cx()).await.into_string();
+    assert!(html.contains(r#"class="offcanvas "#));
+    assert!(!html.contains("offcanvas-lg"));
+
+    let mut responsive = panel(bs::Offcanvas::new().with_breakpoint(Breakpoint::Lg));
+    let html = responsive.render(&mut cx()).await.into_string();
+    assert!(html.contains(r#"class="offcanvas-lg "#));
+    assert!(!html.contains(r#"class="offcanvas "#));
+}