Fix nested float propagation in rich text layout

Propagate descendant float exclusions through non-BFC HTML containers so
floats participate in their nearest block formatting context.

Finalize line geometry before translating propagated exclusions, track
finalized lines incrementally, and search successive float bands when a
fixed-width inline-block does not fit beside active floats.

Recognize inline-block elements as block formatting contexts while
preserving their fixed width. Reuse persistent float-exclusion storage
across relayouts to avoid repeated allocations.

Add SS64 regressions covering narrow viewports, HiDPI rendering, stacked
floats, anchor sizing, SVG sizing, and footer overlap.

Fixed `cursor: pointer`, `pointer` was not registered.

src/tests/unit_tests/uiscenenode_tests.cpp

@@ -10,6 +10,7 @@
 #include <eepp/ui/uiscenenode.hpp>
 #include <eepp/ui/uithememanager.hpp>
 #include <eepp/ui/uiwidget.hpp>
+#include <eepp/window/cursor.hpp>
 #include <eepp/window/engine.hpp>
 #include <eepp/window/input.hpp>
 
@@ -19,6 +20,11 @@ using namespace EE::Window;
 using namespace EE::Scene;
 using namespace EE::UI;
 
+UTEST( UISceneNode, CssPointerCursorUsesHandCursor ) {
+	EXPECT_EQ( Cursor::fromName( "pointer" ), Cursor::Hand );
+	EXPECT_EQ( Cursor::fromName( "POINTER" ), Cursor::Hand );
+}
+
 static UISceneNode* init_test_scene_node() {
 	FileSystem::changeWorkingDirectory( Sys::getProcessPath() );
 	FontTrueType* font = FontTrueType::New( "NotoSans-Regular" ).get();