[studio] Put StudioAppLib in studio namespace

src/studio/applib/src/projectexplorer.cpp

@@ -8,6 +8,8 @@
 
 #include "projectexplorer.hpp"
 
+namespace studio {
+
 static ox::Result<ox::UniquePtr<ProjectTreeModel>>
 buildProjectTreeModel(ProjectExplorer *explorer, ox::CRStringView name, ox::CRStringView path, ProjectTreeModel *parent) noexcept {
 	const auto fs = explorer->romFs();
@@ -59,3 +61,5 @@ ox::Error ProjectExplorer::refreshProjectTreeModel(ox::CRStringView) noexcept {
 	setModel(std::move(model));
 	return OxError(0);
 }
+
+}